SD 磁碟機無法辨識：6 種經驗證的修復方法

2025 年 12 月 28 日 Vasilii 尚未有評論

Nowdays, digital cameras, smartphones, and other portable devices use SD cards to store data. However, it’s not uncommon for users to face the issue where their SD drive is suddenly not recognized by their computer or device. Whether it’s a microSD card, SDHC, or SDXC, this issue can occur for a variety of reasons.

Fortunately, there are multiple solutions to fix an SD card that is not showing up. In this guide, we will explore the common causes and provide step-by-step instructions on how to resolve the problem and recover data from the corrupted SD card.

Why is My SD Drive Is Not Recognized?

There are several reasons why your SD card might not be recognized:

1. Driver Issues

If the drivers for your SD card reader are outdated or corrupted, your computer may fail to detect the card. This is especially common after system updates or hardware changes.

2. Card Reader Problems

The issue might not lie with the SD card itself but with the card reader. If the reader is faulty or incompatible with your SD card, it may fail to detect the card.

3. Corrupted File System

Sometimes, the file system of the SD card can become corrupted, making it unreadable. This often happens when the card is removed improperly or experiences power loss during a write operation.

4. Hardware Failure

In rare cases, SD cards can fail due to internal hardware malfunctions. Physical damage can make the SD card unreadable. This could happen due to wear and tear, exposure to extreme conditions, or improper ejection from a device.

How to Fix an SD Drive That Is Not Recognized

如果您的 SD card is not showing up, follow these troubleshooting steps:

1. Check the SD Card on Another Device

Before assuming your SD card is faulty, test it in another device. If it works in another camera, smartphone, or computer, the issue may lie with your computer or card reader.

2. Restart Your Computer

A simple restart can sometimes resolve detection issues caused by software glitches or temporary hardware malfunctions.

3. Try a Different Card Reader or USB Port

Sometimes, the issue is with the card reader or USB port you’re using. Try using a different card reader or port. If using a USB hub, connect the card reader directly to the computer.

4. Update or Reinstall Drivers for the Not Recognized SD Drive

Outdated or corrupt drivers can make your SD card not recognized. Follow these steps to update or reinstall your drivers:

開啟 裝置管理員 (you can search for it in the Start menu).
Find the SD card reader 在下 磁碟機.
按一下滑鼠右鍵，然後選擇 更新驅動程式 或 解除安裝裝置.
Restart your computer, and Windows should reinstall the drivers automatically.

5. Use Disk Management to Assign a Drive Letter for the Not Recognized SD Drive

If the SD card is physically working but not appearing in File Explorer, you can try to assign a drive letter.

Right-click on the 開始 menu and select 磁碟管理.
Locate the SD card in the list of drives.
Right-click on it and select 變更磁碟機代號和路徑.
Assign a new drive letter.

6. Format the SD Card (If Necessary)

If the system still cannot recognize your SD card, you may need to format it. Formatting will erase all the data, so ensure you have a backup for the data on the SD card.

To format the SD card:

開啟 檔案總管 and right-click on the SD card.
選擇格式.
Choose a file system (exFAT is commonly used for larger cards).
鍵點選開始 to format the card.

If you don’t want to risk data loss by formatting, data recovery from the not recognized SD drive would be the first choice.

How to Recover Files from a Not Recognized SD Drive

如果您已經 lost data due to a corrupted or unreadable SD card, you may still recover the data with the right tools. Magic Data Recovery is an advanced solution for recovering lost files from a non-detected SD card. This tool offers a read-only mode, ensuring that no data is overwritten during the recovery process.

總結

如果您的 SD drive is not recognized, don’t panic. By following the steps outlined above, you can troubleshoot the issue and fix the problem in most cases. If the issue persists and you need to recover lost data, using a data recovery tool like Magic Data Recovery is your best choice before repairing the SD card. Download Magic Data Recovery to safely recover your files from SD cards, and ensure your data is protected from future issues.

下載 Magic Data Recovery

支援 Windows 7/8/10/11 和 Windows Server

SD Drive Not Recognized – FAQ

1.How to fix SD drive not recognized?

If the computer cannot recognize the SD card, start by checking whether it works on another device to rule out hardware failure. If the card is functional, update or reinstall the SD card reader drivers and verify the card appears in Disk Management. Assigning a new drive letter often resolves detection issues caused by system conflicts.

2.Why is my SD card suddenly unreadable?

An SD card may suddenly become unreadable due to file system corruption, unsafe removal, power interruption during data transfer, or internal memory wear. In many cases, the data is still intact but inaccessible until the file system is repaired or scanned with a professional recovery tool.

3.Why won't my SD card show up in files?

If the SD card does not appear in File Explorer, it may not have a valid drive letter or the file system may be damaged. Checking Disk Management helps determine whether the card is detected at a lower level by the operating system. When the card is visible there but inaccessible, data recovery should be performed before formatting.

4.How do I get my computer to read my micro SD card?

To make a computer read a micro SD card, use a compatible card reader and ensure the reader drivers are properly installed. Testing the card on another system helps confirm whether the issue is software-related or hardware-related. Updating reader and USB drivers can also improve detection reliability.

5.How to fix a dead micro SD card?

A micro SD card that appears dead may be suffering from severe corruption or internal controller failure. While physical damage cannot be repaired, data can sometimes be recovered using read-only recovery software before the card is retired. Continued use is not recommended once failure symptoms appear.

6.What is the lifespan of an SD card?

The average lifespan of an SD card ranges from several years to a decade, depending on write cycles, usage frequency, and environmental conditions. Cards used for continuous recording, such as in cameras or dashcams, tend to wear out faster due to limited flash memory write endurance.

7.How to recover an undetected SD card?

Even if an SD card is not detected in File Explorer, it may still be accessible at the disk level. Professional tools like Magic Data Recovery can scan undetected or RAW SD cards in read-only mode and safely extract recoverable files without modifying the original storage.

8.How to tell if an SD card is bad?

An SD card may be failing if it frequently disconnects, becomes read-only, produces repeated file errors, or is not recognized by multiple devices. When these symptoms occur, stop using the card immediately and attempt data recovery to prevent permanent data loss.

WiKi

Vasilii

Vasilii 是一位在該領域擁有約 10 年實務經驗的資料復原專家。在他的職業生涯中，他已成功解決數千個複雜的個案，包括刪除的檔案、格式化的硬碟機、遺失的磁碟分割和 RAW 檔案系統。他的專業知識涵蓋使用十六進位編輯器等專業工具的手動復原方法，以及使用復原軟體的進階自動解決方案。Vasilii 的使命是讓 IT 專業人士和一般使用者都能獲得可靠的資料復原知識，協助他們保護寶貴的數位資產。.

SD 磁碟機無法辨識：6 種經驗證的修復方法

目錄

Why is My SD Drive Is Not Recognized?