How to Repair and Restore Unallocated Space on USB/SD Card?

Problem: USB/SD card stops working, showing as unallocated, how to fix it?

Have you ever met this problem that your SD card or USB drive suddenly shows as unallocated or even stops working in your PC? You can't neither access data nor save new data on it.

When such a problem happened, most users would simply abandon the USB drive or SD card, thinking that the drive can never be repaired and nothing can be done!

If you are having exact the same thought, stop thinking so right now! Now the unallocated space error on USB drive, SD card or memory card can be fixed on your own! How? Here below, we'll provide you effective methods to help you repair and fix unallocated USB/SD card with simple steps now.

How to fix and repair USB/SD card showing unallocated error?

Here you'll have two steps to go for repairing unallocated USB drive or SD card:

Step 1. Recover data from unallocated space on USB/SD card

In order to protect you from losing data on unallocated USB drive or SD card, you shall firstly try a professional data recovery software to get your precious data restored in advance.

Here you may try EaseUS Data Recovery Wizard which supports you to recover data from unallocated USB drive/SD card within 3 simple steps:

Launch software > Select location and scan > Preview and restore.

Step 2. Repair unallocated USB/SD card

To restore unallocated space on USB drive or SD card, you have two choices here:
1. Repair unallocated USB/SD card with CMD;
2. Restore unallocated space on USB/SD card with free partition manager software.

You may selectively follow either one method to restore and repair unallocated space on USB/SD card and make your device reusable again.

Method 1. Repair unallocated USB/SD with CMD

• Type: list disk and hit Enter;
• Type: select disk 0 and hit Enter; (0 shall be the drive letter of your unallocated USB/SD card.)
• Type: create partition primary and hit Enter;
• After this process, type: exit and hit Enter to finish the process.
• Go to your USB drive or SD card, right-click it and select Format.
• Set the file system and rename it for your USB drive or SD card then click Start to make it reusable again.

Method 2. Restore unallocated USB/SD card with free partition manager software

If you prefer a simpler way to repair unallocated USB or SD card, you may try free partition manager software - EaseUS Partition Master Free. 

This software allows you to restore unallocated USB/SD card within 3 simple steps. You may download it and follow below tutorial steps to get problem fixed now:

1. Run EaseUS Partition Master Free and right-click unallocated SD or USB drive, select Wipe Data;

2. After this, right-click unallocated SD/USB and select Create partition;
Set file system, size for the SD or memory card.
3. Finally, click Apply. Then the unallocated SD memory card will be usable again.