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Once complete, the drive will show as "Unallocated" in Disk Management. You will need to initialize it, create a new partition, and perform a high-level format (NTFS/FAT32).
To truly do a low-level operation on a USB flash drive, you need to bypass the OS and talk directly to the using vendor-specific commands. This is done with tools like: usb lowlevel format
: If your 64GB drive suddenly shows only 200MB. Once complete, the drive will show as "Unallocated"
The most famous tool for this job is by HDDGuru. Despite the name, it works perfectly for USB flash drives. This is done with tools like: : If
: Repairing drives with invalid Master Boot Records (MBR), hidden partitions, or corrupted boot sectors.
Open the , type cmd , right-click it, and select Run as Administrator . Type diskpart and hit Enter.