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

Updated on Dec 10, 2018 by Tracy King to Partition Manager

Summary:
If your SD card or USB drive etc storage devices suddenly become unallocated, don’t worry. Here in this article we’ll provide you effective methods to restore unallocated space on USB/SD card and fix USB/SD card with unallocated space error within 2 steps. Follow to get your problem fixed now.

Problem: USB/SD card stops working, showing as unallocated

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 neither access data nor save new data on it.

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

If you are having the same thought, stop thinking so right now! Now the unallocated space error on a 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 this issue 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

To protect you from losing data on the unallocated USB drive or SD card, you shall first 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 three simple steps:

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

Step 2. Repair unallocated USB/SD card

To restore unallocated space on the USB drive or SD card, you have two choices here:
1. Repair the 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 more straightforward way to repair unallocated USB or SD card, you may try free partition manager software - EaseUS Partition Master Free. 

Download Now

 Windows 10 is supported

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. Wipe data on unallocated USB/SD card

 

Step 1: Launch EaseUS Partition Master, right-click the partition you want to erase data from, and choose "Wipe Data".

Wipe Partition - Step 1

Step 2: In the new window, set the time for which you want to wipe your partition, then click "OK".

Wipe Partition - Step 2

Step 3: Click the "Execute Operation" button in the top-right corner, check the changes, then click "Apply" to wipe the data on your partition.

Wipe Partition - Step 3

# 2. Create a partition on unallocated space in USB/SD card 

Notice:
If you want to create a partition on an empty USB, SD card or external hard drive, connect it to your PC in advance.
 

Step 1: Launch EaseUS Partition Master

On the main window, right-click on the unallocated space on your hard drive or external storage device and select "Create".

Create partition on unallocated space

Step 2: Adjust the new partition size, file system, label, etc.

Set the size, partition label, drive letter, file system, etc. for the new partition and click "OK" to continue.

Set up new partition

Step 3: Confirm to create a new partition

Click on the "Execute Operation" button and confirm to create a new partition by clicking "Apply".

Confirm and keep all changes