{"id":58008,"date":"2026-10-30T10:48:30","date_gmt":"2026-10-30T02:48:30","guid":{"rendered":"https:\/\/www.amagicsoft.com\/?p=58008"},"modified":"2026-10-30T10:49:51","modified_gmt":"2026-10-30T02:49:51","slug":"allocation-unit-size","status":"publish","type":"post","link":"https:\/\/www.amagicsoft.com\/pt\/kb\/disk-partition\/allocation-unit-size.html","title":{"rendered":"Tamanho da unidade de aloca\u00e7\u00e3o: tamanho do cluster e setores no Windows"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"58008\" class=\"elementor elementor-58008\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-yrmzzlv dtec-docx-root dtec-post-58008 e-flex e-con-boxed e-con e-parent\" data-id=\"yrmzzlv\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-x68n72v elementor-widget elementor-widget-text-editor\" data-id=\"x68n72v\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Allocation unit size is the size of a cluster\u2014the unit a file system uses to allocate storage space on a volume.<\/strong> In Windows formatting tools, \u201callocation unit size\u201d and \u201ccluster size\u201d describe the same setting. A cluster contains one or more logical sectors, but changing its size does not change the drive\u2019s sector format.<\/p>\n<p>This setting appears when formatting a USB drive, external disk, or Windows data volume. It affects space efficiency and some file system features. This guide covers Windows 10 and Windows 11, focusing on NTFS while explaining the relevant differences for FAT32 and exFAT.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-hdpsimh elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"hdpsimh\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;exclude_headings_by_selector&quot;:&quot;.faq-no-toc, h2:contains(Data Recovery Assessment)&quot;,&quot;marker_view&quot;:&quot;bullets&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;},&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__hdpsimh\" aria-expanded=\"true\" aria-label=\"Inhaltsverzeichnis \u00f6ffnen\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__hdpsimh\" aria-expanded=\"true\" aria-label=\"Inhaltsverzeichnis schlie\u00dfen\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__hdpsimh\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b3m9qy8 elementor-widget elementor-widget-heading\" data-id=\"b3m9qy8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How File Systems Allocate Storage<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8gp7yd4 elementor-widget elementor-widget-text-editor\" data-id=\"8gp7yd4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A file system needs to track which storage locations belong to each file and which remain available. Clusters provide a manageable unit for that bookkeeping.<\/p>\n<p>When a file needs space outside its metadata record, the file system allocates clusters to hold its contents. As the file grows, it can receive additional clusters. Those clusters do not necessarily sit next to one another: the file system records their locations so Windows can retrieve the complete file.<\/p>\n<p>On <a href=\"https:\/\/www.amagicsoft.com\/wiki\/what-is-ntfs-file-system.html\">NTFS volumes<\/a>, file records and data mappings describe where file contents are stored. Some small files can instead keep their contents inside a <a href=\"https:\/\/www.amagicsoft.com\/wiki\/ntfs-master-file-table.html\">Master File Table record<\/a>, without a separate allocation of data clusters.<\/p>\n<p>FAT32 uses a different structure. Its <a href=\"https:\/\/www.amagicsoft.com\/wiki\/file-allocation-table-fat.html\">File Allocation Table<\/a> tracks the cluster chains belonging to files.<\/p>\n<p>The allocation unit size applies to the formatted volume, rather than to every partition on the physical disk. Two volumes on the same drive can therefore use different cluster sizes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b467ahm elementor-widget elementor-widget-heading\" data-id=\"b467ahm\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cluster vs. Sector: Key Differences<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-lkv3gl9 elementor-widget elementor-widget-text-editor\" data-id=\"lkv3gl9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A <strong>cluster<\/strong> belongs to the file system\u2019s allocation scheme. A <strong>sector<\/strong> belongs to the storage addressing and reporting layers beneath it.<\/p>\n<p>Windows also distinguishes between logical sectors and reported physical sectors.<\/p>\n<table><tbody><tr><td><p><strong>Term<\/strong><\/p><\/td><td><p><strong>What it describes<\/strong><\/p><\/td><td><p><strong>Example<\/strong><\/p><\/td><\/tr><tr><td><p>Allocation unit or cluster<\/p><\/td><td><p>The unit used to allocate file system storage<\/p><\/td><td><p>A 4,096-byte NTFS cluster<\/p><\/td><\/tr><tr><td><p>Logical sector<\/p><\/td><td><p>The unit used to address storage locations<\/p><\/td><td><p>A 512-byte logical sector<\/p><\/td><\/tr><tr><td><p>Physical sector<\/p><\/td><td><p>The physical sector size reported through the storage device and driver<\/p><\/td><td><p>A reported 4,096-byte physical sector<\/p><\/td><\/tr><\/tbody><\/table>\n<p><strong>Example:<\/strong> A volume with 4,096-byte clusters and 512-byte logical sectors has eight logical sectors per cluster.<\/p>\n<p>On a 512e drive, Windows can see 512-byte logical sectors while the device reports 4,096-byte physical sectors. A 4Kn drive reports 4,096 bytes for both.<\/p>\n<p>Choosing 4 KB clusters does not convert a 512e drive into a 4Kn drive. Likewise, choosing 64 KB clusters does not create 64 KB hardware sectors.<\/p>\n<p>Cluster size is also different from partition alignment. Cluster size describes allocation length; alignment concerns where a partition or operation begins relative to underlying storage boundaries. A particular cluster size alone does not prove correct alignment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-j5tmv46 elementor-widget elementor-widget-heading\" data-id=\"j5tmv46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">File Size, Allocated Space, and Cluster Slack<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-sprle5n elementor-widget elementor-widget-text-editor\" data-id=\"sprle5n\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In File Explorer, <strong>Size<\/strong> describes a file\u2019s logical length. <strong>Size on disk<\/strong> reflects its allocated storage.<\/p>\n<p>For an ordinary, uncompressed, nonsparse file stored outside its NTFS file record, allocation generally rounds up to a whole number of clusters. Unused space at the end of the final allocated cluster is commonly called <strong>file slack<\/strong>.<\/p>\n<h3>A Practical Allocation Example<\/h3>\n<p><strong>Example:<\/strong> Consider a file containing exactly 10,240 bytes of data.<\/p>\n<table><tbody><tr><td><p><strong>Cluster size<\/strong><\/p><\/td><td><p><strong>Clusters required<\/strong><\/p><\/td><td><p><strong>Allocated file data space<\/strong><\/p><\/td><td><p><strong>Unused space in the final cluster<\/strong><\/p><\/td><\/tr><tr><td><p>4,096 bytes<\/p><\/td><td><p>3<\/p><\/td><td><p>12,288 bytes<\/p><\/td><td><p>2,048 bytes<\/p><\/td><\/tr><tr><td><p>65,536 bytes<\/p><\/td><td><p>1<\/p><\/td><td><p>65,536 bytes<\/p><\/td><td><p>55,296 bytes<\/p><\/td><\/tr><\/tbody><\/table>\n<p>This calculation describes the file\u2019s data allocation. It excludes directory entries and other file system metadata.<\/p>\n<p>For one file, the difference may be insignificant. Across many small files, however, larger clusters can consume considerably more space.<\/p>\n<p>The effect is less pronounced for files that are already large relative to the cluster size. A collection of large videos has a different allocation pattern from a folder containing thousands of small documents or configuration files.<\/p>\n<h3>Exceptions to Standard Cluster Allocation<\/h3>\n<p>NTFS resident data, compression, and sparse files can change the relationship between logical length and allocated space. Consequently, a tiny file is not a reliable tool for measuring cluster size.<\/p>\n<p>Folder totals also depend on which files Windows can enumerate. A difference between a folder\u2019s reported size and the volume\u2019s used capacity does not, by itself, prove excessive slack or corruption.<\/p>\n<p>Check the volume\u2019s actual allocation unit size before drawing conclusions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a8hwzod elementor-widget elementor-widget-heading\" data-id=\"a8hwzod\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Choosing an Allocation Unit Size in Windows<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-zyojtr1 elementor-widget elementor-widget-text-editor\" data-id=\"zyojtr1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>For general Windows use, keep the formatter\u2019s default allocation unit size unless a documented requirement justifies another value.<\/strong><\/p>\n<p>Windows selects defaults according to the file system and volume size. \u201cDefault\u201d therefore does not mean the same numerical value for every device or format.<\/p>\n<p>A 4,096-byte allocation unit\u2014often displayed as 4 KB\u2014is common for ordinary NTFS volumes. Technically, 4,096 bytes is 4 KiB; Windows interfaces and documentation frequently use \u201cKB\u201d for this setting.<\/p>\n<table><tbody><tr><td><p><strong>Situation<\/strong><\/p><\/td><td><p><strong>Practical starting point<\/strong><\/p><\/td><td><p><strong>What to consider<\/strong><\/p><\/td><\/tr><tr><td><p>Everyday NTFS data volume<\/p><\/td><td><p>Windows default<\/p><\/td><td><p>Suitable for mixed documents, applications, photos, and other files<\/p><\/td><\/tr><tr><td><p>NTFS volume holding many small files<\/p><\/td><td><p>Default, commonly 4,096 bytes<\/p><\/td><td><p>Large clusters can increase unused allocation space<\/p><\/td><\/tr><tr><td><p>Volume requiring standard NTFS file compression<\/p><\/td><td><p>A supported cluster size no larger than 4,096 bytes<\/p><\/td><td><p>Standard NTFS compression is unavailable above this size<\/p><\/td><\/tr><tr><td><p>Dedicated application or server storage<\/p><\/td><td><p>The application\u2019s documented requirement<\/p><\/td><td><p>A workload-specific value is not a general desktop recommendation<\/p><\/td><\/tr><tr><td><p>FAT32 or exFAT removable storage<\/p><\/td><td><p>Formatter or device default<\/p><\/td><td><p>File system, volume capacity, and receiving-device compatibility matter<\/p><\/td><\/tr><\/tbody><\/table>\n<h3>Cluster Size and Storage Performance<\/h3>\n<p>Larger clusters reduce the number of allocation units needed to represent a given amount of data. Some applications and storage workloads benefit from particular allocation sizes.<\/p>\n<p>That does not establish a universal speed improvement. Performance also depends on request sizes, caching, fragmentation, hardware, and application behavior.<\/p>\n<p>Microsoft provides specific formatting guidance for workloads such as hosting very large VHDX files. Such guidance should not be generalized into \u201c64 KB is best for every SSD.\u201d<\/p>\n<p>An SSD does not require a larger cluster size simply because it uses flash memory.<\/p>\n<h3>Volume Capacity and File System Requirements<\/h3>\n<p>NTFS volume limits depend partly on cluster size. For example, Microsoft lists approximately 16 TB as the supported NTFS volume limit with 4 KB clusters. Very large volumes may therefore require a different configuration.<\/p>\n<p>FAT32 and exFAT have their own allocation rules. Do not transfer an NTFS recommendation directly to a removable drive formatted as exFAT. The <a href=\"https:\/\/www.amagicsoft.com\/wiki\/exfat-file-system.html\">exFAT file system guide<\/a> explains its use for portable storage and large files.<\/p>\n<p>If an existing drive works correctly and has no demonstrated allocation problem, changing its cluster size usually offers little practical benefit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-wz9lr7s elementor-widget elementor-widget-heading\" data-id=\"wz9lr7s\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Checking Allocation Unit Size in Windows<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1lsmrti elementor-widget elementor-widget-text-editor\" data-id=\"1lsmrti\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Checking the existing value does not require formatting the drive.<\/p>\n<p>First, identify the correct volume in File Explorer or Disk Management. Confirm its drive letter, label, capacity, and file system.<\/p>\n<p>The commands below use <strong>E:<\/strong> as an example. Replace it with the actual target volume. The screenshots use <strong>C:<\/strong> from the source document\u2019s example system.<\/p>\n<h3>Check with Windows PowerShell<\/h3>\n<p>Open <strong>Windows PowerShell as administrator<\/strong> and run:<\/p>\n<ol><li><code class=\"dtec-inline-code dtec-command\">Get-Volume -DriveLetter E | Format-List<\/code><\/li><\/ol>\n<p>Find these properties:<\/p>\n<ul><li><strong>DriveLetter:<\/strong> confirms the selected volume.<\/li><li><strong>FileSystem:<\/strong> identifies its format.<\/li><li><strong>AllocationUnitSize:<\/strong> reports the allocation unit size in bytes.<\/li><\/ul>\n<p>A value of <code class=\"dtec-inline-code\">4096<\/code> means 4,096-byte clusters. A value of <code class=\"dtec-inline-code\">65536<\/code> means 65,536-byte clusters.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-qfkjch3 elementor-widget elementor-widget-image\" data-id=\"qfkjch3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.amagicsoft.com\/wp-content\/uploads\/2026\/10\/windows-powershell-allocation-unit-size.webp\" title=\"\" alt=\"Windows PowerShell Get-Volume output showing AllocationUnitSize of 4096 bytes\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-j42vg8e elementor-widget elementor-widget-text-editor\" data-id=\"j42vg8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>Windows PowerShell displays AllocationUnitSize as 4096 for the example NTFS volume. Source: 7thSense, \u201cFile System File Size and Size on Disk,\u201d page 6; historical interface example.<\/em><\/p>\n<p>For a shorter result, select only the relevant properties:<\/p>\n<ol><li><code class=\"dtec-inline-code dtec-command\">Get-Volume -DriveLetter E |<\/code><\/li><li>    Select-Object DriveLetter, FileSystem, AllocationUnitSize<\/li><\/ol>\n<p>If the property is unavailable or the command cannot query the volume, do not interpret that result as a zero-byte cluster size. Confirm the target and use a suitable file system-specific query.<\/p>\n<h3>Check an NTFS Volume with Fsutil<\/h3>\n<p>In an administrator Command Prompt or Terminal, run:<\/p>\n<ol><li>fsutil fsinfo ntfsinfo E:<\/li><\/ol>\n<p>Look for <strong>Bytes Per Cluster<\/strong>. This is the NTFS allocation unit size.<\/p>\n<p>The output can also contain <strong>Bytes Per Sector<\/strong> and <strong>Bytes Per Physical Sector<\/strong>. These describe sector properties and should not be substituted for the cluster value.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-iwia22c elementor-widget elementor-widget-image\" data-id=\"iwia22c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.amagicsoft.com\/wp-content\/uploads\/2026\/10\/windows-fsutil-ntfs-cluster-size.webp\" title=\"\" alt=\"Command Prompt fsutil ntfsinfo output showing Bytes Per Cluster as 4096\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ud8trpy elementor-widget elementor-widget-text-editor\" data-id=\"ud8trpy\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>The example reports 4,096 bytes per cluster and 512 bytes per logical and physical sector. Source: 7thSense, \u201cFile System File Size and Size on Disk,\u201d page 6; these values describe that example volume.<\/em><\/p>\n<p>For additional sector information, use:<\/p>\n<ol><li>fsutil fsinfo sectorinfo E:<\/li><\/ol>\n<p>The <code class=\"dtec-inline-code\">ntfsinfo<\/code> query is specific to NTFS. Its failure on exFAT does not demonstrate that the drive is damaged.<\/p>\n<p>These commands query information; they do not change the allocation unit size or repair the file system.<\/p>\n<h3>Limitations of the Windows Format Dialog<\/h3>\n<p>The Windows Format dialog configures a proposed formatting operation. Its selected allocation value should not replace a query of the existing volume.<\/p>\n<p>Use PowerShell or Fsutil to inspect the current configuration. There is no need to click <strong>Start<\/strong> in a formatting window just to discover it.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-y37q38w elementor-widget elementor-widget-heading\" data-id=\"y37q38w\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Changing Cluster Size and Protecting Existing Files<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7sijkz elementor-widget elementor-widget-text-editor\" data-id=\"b7sijkz\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Windows\u2019 built-in formatting tools set the allocation unit size when creating the file system. They do not provide a simple in-place cluster-size setting for an existing volume.<\/p>\n<p>For a <strong>healthy, nonsystem data volume<\/strong>, the straightforward approach is:<\/p>\n<ol><li>Copy all required files to a separate healthy storage device.<\/li><li>Open representative files from that copy and confirm the backup is complete.<\/li><li>Identify the original volume again by drive letter, label, and capacity.<\/li><li>Reformat it using the intended file system and allocation unit size.<\/li><li>Query the formatted volume to confirm the new setting.<\/li><li>Restore the files and verify their contents.<\/li><\/ol>\n<p>Formatting removes normal access to existing files. Quick Format is not a way to preserve them while changing cluster size.<\/p>\n<p>A Windows system volume requires a separate backup and restoration or deployment plan. Do not treat formatting the running Windows volume as an ordinary data-drive adjustment.<\/p>\n<p>Some third-party utilities advertise changes without reformatting. Such operations still modify file system structures and require a verified backup.<\/p>\n<p>Defragmenting a volume does not change its cluster size. Enlarging a partition also does not automatically replace the existing allocation unit size.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-k21r17z elementor-widget elementor-widget-heading\" data-id=\"k21r17z\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cluster Size Settings and Drive Health<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-gi6m6rq elementor-widget elementor-widget-text-editor\" data-id=\"gi6m6rq\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A larger-than-expected allocation unit can reflect an earlier formatting choice, another operating system, or a specialized workload. It does not automatically indicate drive damage.<\/p>\n<p>The number alone is not a diagnosis.<\/p>\n<table><tbody><tr><td><p><strong>Observation<\/strong><\/p><\/td><td><p><strong>What it may indicate<\/strong><\/p><\/td><td><p><strong>Appropriate next step<\/strong><\/p><\/td><\/tr><tr><td><p>Large clusters, but files open normally<\/p><\/td><td><p>A formatting choice<\/p><\/td><td><p>Assess actual space usage before changing anything<\/p><\/td><\/tr><tr><td><p>Many small files occupy much more allocated space<\/p><\/td><td><p>Allocation overhead may contribute<\/p><\/td><td><p>Confirm cluster size and file characteristics<\/p><\/td><\/tr><tr><td><p>Windows asks to format the drive<\/p><\/td><td><p>Windows cannot recognize or access the file system normally<\/p><\/td><td><p>Cancel the prompt and protect important files<\/p><\/td><\/tr><tr><td><p>Repeated I\/O errors or disconnections<\/p><\/td><td><p>Possible connection, device, or media trouble<\/p><\/td><td><p>Investigate stability before scanning or reformatting<\/p><\/td><\/tr><tr><td><p>Files disappeared after formatting<\/p><\/td><td><p>A data-loss event<\/p><\/td><td><p>Stop writing to the affected device<\/p><\/td><\/tr><\/tbody><\/table>\n<p>Changing cluster size does not repair physical media damage. If read errors suggest an HDD problem, follow a suitable <a href=\"https:\/\/www.amagicsoft.com\/disk-issue-fix\/check-hard-drive-for-bad-sectors.html\">hard drive bad-sector diagnostic workflow<\/a>.<\/p>\n<p>If formatting has already removed access to files, check backups first and review the options for <a href=\"https:\/\/www.amagicsoft.com\/format-file-recovery\/how-to-recover-a-formatted-hard-drive-for-free.html\">recovering files from a formatted hard drive<\/a>. Recovery depends on what remains readable; overwritten data and SSD TRIM can prevent it.<\/p>\n<p>File recovery and choosing a new allocation unit size are separate tasks. Protect the files before rebuilding the volume.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-gsaonih elementor-widget elementor-widget-heading\" data-id=\"gsaonih\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQs<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eiyfdk6 faq-no-toc dtec-faq elementor-widget elementor-widget-elementskit-faq\" data-id=\"eiyfdk6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"elementskit-faq.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"ekit-wid-con\" >\n                <div class=\"elementskit-single-faq elementor-repeater-item-lg5f6mt\">\n            <div class=\"elementskit-faq-header\">\n                <h3 class=\"elementskit-faq-title\">Is allocation unit size the same as cluster size?<\/h3>\n            <\/div>\n            <div class=\"elementskit-faq-body\">\n                Yes. In Windows file system formatting, both terms describe the allocation size used by the volume. Neither term means the drive\u2019s physical sector size.            <\/div>\n        <\/div>\n                <div class=\"elementskit-single-faq elementor-repeater-item-afdqkz2\">\n            <div class=\"elementskit-faq-header\">\n                <h3 class=\"elementskit-faq-title\">Can different partitions on one disk have different cluster sizes?<\/h3>\n            <\/div>\n            <div class=\"elementskit-faq-body\">\n                Yes. Each formatted volume has its own file system configuration. An NTFS volume and an exFAT volume on the same physical disk can use different allocation unit sizes.            <\/div>\n        <\/div>\n                <div class=\"elementskit-single-faq elementor-repeater-item-vzfc8yy\">\n            <div class=\"elementskit-faq-header\">\n                <h3 class=\"elementskit-faq-title\">Does a larger cluster size increase maximum file size?<\/h3>\n            <\/div>\n            <div class=\"elementskit-faq-body\">\n                It can affect NTFS file and volume limits, but the file system and Windows version also matter. Increasing FAT32 cluster size does not remove FAT32\u2019s approximately 4 GB per-file limit.            <\/div>\n        <\/div>\n                <div class=\"elementskit-single-faq elementor-repeater-item-7o5jidf\">\n            <div class=\"elementskit-faq-header\">\n                <h3 class=\"elementskit-faq-title\">Can a 4 KB cluster contain several small files?<\/h3>\n            <\/div>\n            <div class=\"elementskit-faq-body\">\n                Ordinary independently allocated file data does not share the same allocated cluster merely because several files would fit inside it. NTFS resident data is a separate case: small file contents may reside inside their metadata records.            <\/div>\n        <\/div>\n                <div class=\"elementskit-single-faq elementor-repeater-item-86rtvff\">\n            <div class=\"elementskit-faq-header\">\n                <h3 class=\"elementskit-faq-title\">Will changing cluster size recover missing disk capacity?<\/h3>\n            <\/div>\n            <div class=\"elementskit-faq-body\">\n                It may reduce allocation overhead when many small files occupy large clusters. It will not recover capacity reserved for other partitions, remove file system metadata requirements, or correct the difference between decimal drive capacities and binary capacity displays.            <\/div>\n        <\/div>\n                                <script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is allocation unit size the same as cluster size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. In Windows file system formatting, both terms describe the allocation size used by the volume. Neither term means the drive\u2019s physical sector size.\"}},{\"@type\":\"Question\",\"name\":\"Can different partitions on one disk have different cluster sizes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Each formatted volume has its own file system configuration. An NTFS volume and an exFAT volume on the same physical disk can use different allocation unit sizes.\"}},{\"@type\":\"Question\",\"name\":\"Does a larger cluster size increase maximum file size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It can affect NTFS file and volume limits, but the file system and Windows version also matter. Increasing FAT32 cluster size does not remove FAT32\u2019s approximately 4 GB per-file limit.\"}},{\"@type\":\"Question\",\"name\":\"Can a 4 KB cluster contain several small files?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ordinary independently allocated file data does not share the same allocated cluster merely because several files would fit inside it. NTFS resident data is a separate case: small file contents may reside inside their metadata records.\"}},{\"@type\":\"Question\",\"name\":\"Will changing cluster size recover missing disk capacity?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It may reduce allocation overhead when many small files occupy large clusters. It will not recover capacity reserved for other partitions, remove file system metadata requirements, or correct the difference between decimal drive capacities and binary capacity displays.\"}}]}<\/script>\n                \n    <\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Allocation unit size is the size of a cluster\u2014the unit a file system uses to allocate storage space on a volume. In Windows formatting tools, \u201callocation unit size\u201d and \u201ccluster size\u201d describe the same setting. A cluster contains one or more logical sectors, but changing its size does not change the drive\u2019s sector format. This [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":58009,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[842],"tags":[844],"class_list":["post-58008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-disk-partition","tag-windows-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Allocation Unit Size Explained for Windows | Amagicsoft<\/title>\n<meta name=\"description\" content=\"What allocation unit size means, how clusters differ from sectors, how to check Windows drive, and when changing the default makes sense.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.amagicsoft.com\/pt\/kb\/disk-partition\/allocation-unit-size.html\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Allocation Unit Size: Cluster Size and Sectors in Windows\" \/>\n<meta property=\"og:description\" content=\"What allocation unit size means, how clusters differ from sectors, how to check Windows drive, and when changing the default makes sense.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.amagicsoft.com\/pt\/kb\/disk-partition\/allocation-unit-size.html\" \/>\n<meta property=\"og:site_name\" content=\"Amagicsoft\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/amagicsoft.2024\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-30T02:48:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-30T02:49:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.amagicsoft.com\/wp-content\/uploads\/2026\/10\/allocation-unit-size-cluster-size-sectors-windows-1350x760-1.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1350\" \/>\n\t<meta property=\"og:image:height\" content=\"760\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Jason\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Amagicsoft\" \/>\n<meta name=\"twitter:site\" content=\"@Amagicsoft\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jason\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/kb\\\/disk-partition\\\/allocation-unit-size.html#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/kb\\\/disk-partition\\\/allocation-unit-size.html\"},\"author\":{\"name\":\"Jason\",\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/zh\\\/#\\\/schema\\\/person\\\/0578d4121e816aeb4661c464e92daf57\"},\"headline\":\"Allocation Unit Size: Cluster Size and Sectors in Windows\",\"datePublished\":\"2026-10-30T02:48:30+00:00\",\"dateModified\":\"2026-10-30T02:49:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/kb\\\/disk-partition\\\/allocation-unit-size.html\"},\"wordCount\":2029,\"publisher\":{\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/zh\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.amagicsoft.com\\\/kb\\\/disk-partition\\\/allocation-unit-size.html#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.amagicsoft.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/allocation-unit-size-cluster-size-sectors-windows-1350x760-1.webp\",\"keywords\":[\"Windows Storage\"],\"articleSection\":[\"Disk &amp; 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