System hacks: Rescue USB memory with unallocated space error

In the process of using the USB memory, there is a relatively common problem, that is, after inserting the device there is an error message of unallocated space, the data in the device all disappeared, also became unable to read and write, this situation in Windows 10 how to deal with it?

Tip: After this problem occurs, first try another computer to see if the storage device can be recognized to rule out the current system problem. If the problem persists, then perform the following operations. A special reminder is that the data in the storage device is basically hopeless to recover, if there is indeed very important data, please do not act rashly, take it to a professional data recovery agency to try to recover.

1. Reasons for unallocated space errors

Unallocated space errors are usually caused by users accidentally deleting partitions on USB devices or SD cards, or by malicious software “doing it for you”. In addition, alternative operating systems that change the partition type of a mobile device can also cause Windows recognition problems. Also, improper use of certain third-party software or unsuccessful formatting may cause this problem.

2. Repair in Windows Disk Manager

From the System Control menu, start the Disk Manager program (Figure 1). Find the disk number where the USB drive is located in Disk Manager, right-click on the area and select “New Simple Volume”, then follow the on-screen prompts to complete the subsequent operations of creating a new partition and formatting it. Finally, test the drive to see if it can read and write data.


3. Use third-party special tools to solve

If you can’t fix it with Windows Disk Management tool, try formatting it with HP USB Disk Format Tool software, which can be used specifically to format and repair corrupted USB storage devices (download at storage_format_tool/).


After downloading, right-click on the EXE file and select “Run as administrator” to start the program. After that, insert the USB storage device, select the removable storage device from the Device menu, select the file system from the File system list, and click the Start button to start formatting (Figure 2).

4. Use the DiskPart command to resolve

If you still can’t solve the problem with the above methods, you can try to use the DiskPart command that comes with Windows to solve it. Since this command is dangerous, please be careful!

First, press Win+R to launch the Run box, type diskpart in the Run dialog box, and then press Ctrl+Shift+Enter to execute diskpart in administrator mode.

Type “list disk” and enter to list the drives, then type Select disk n (where n stands for the inserted USB drive number. Note! (Don’t choose the wrong number to avoid deleting the drive data by mistake). Next, type clean and enter to delete all volumes and partitions on the selected USB drive (Figure 3).


After that, type “create partition primary” and press enter to create a primary partition. Once the partition is successfully created, you can use it normally as mentioned in Article 2.

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