A disk sector is a fixed-size unit used to organize and access data on a storage device. The operating system addresses logical sectors, while the device also reports physical sector information that matters for write alignment and compatibility. These sizes can differ: a 512e hard drive exposes 512-byte logical sectors over 4,096-byte physical sectors. Sector size becomes relevant when checking drive specifications, cloning a disk, interpreting storage errors, or investigating partition alignment. It is also easy to confuse with a file system’s allocation unit size. This guide explains the differences and provides read-only checks for Windows 10 and Windows 11, with notes for HDDs, SSDs, and storage presented through controllers […]
