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Restoring the USB disk to its full disk space can be tricky. If the usual format option is not showing the full disk space, try the steps below:

1. Run cmd as admin
2. Type the commands:  diskpart
3. Show available disks: list disk
4. Select the USB Disk: select disk 1 (Be careful)
5. Type: clean
6. Type: create partition primary
7. Type: format fs=ntfs quick