I have an USB stick totalling 8GB. It has three "partitions":

enter image description here

  • 41 MB Unallocated
  • D: 2MB Fat
  • the rest is unallocated

I want to completly format the USB drive. Yet when I do right click on D:\ and select format it will only format the 2.25MB partition:

enter image description here

I cannot delete the D:\ partition within Disk Management tool ("Create and format hard disk partitions"). When I right click it, all options are grayed out.

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I tried ejecting the disk, but then it also disappears from the disk management tool.

(I assumed unmounting the D:\ drive would let me delete the partitions, yet as it appears: ejecting is not unmounting.)

How to format the entire USB stick using the Windows Disk Management tool?

  • 1
    What tool did you use to originally create the partition? Edit your question instead of submitting a comment
    – Ramhound
    Commented Jan 15, 2022 at 3:22
  • 1
    Use diskpart in cmd prompt, use the "clean" command once the proper usb device is selected. Now you should be able to format it.
    – Moab
    Commented Jan 15, 2022 at 14:13
  • Or a free third-party tool, such as DiskGenius. Commented Jan 16, 2022 at 0:36

1 Answer 1


It turns out that Windows protects EFI partition from being deleted. One is able to delete the partion via

  • diskpart (Win + R, enter the command, a terminal windows with diskpart running will pop up)
  • list disk, will print a list of all disks, e.g.:
DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online         3726 GB      0 B        *
  Disk 1    Online          931 GB  1024 KB        *
  Disk 2    Online          238 GB   450 MB
  Disk 3    Online          476 GB      0 B        *
  Disk 5    Online           57 GB    57 GB
  • select your relevant disk. in my case, it's Disk five: sel disk 5 (double check your disk numeber!)
  • list partition
DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    System            3968 KB  1988 MB

DISKPART> sel partition 1

And finally, deleted the partion via:

DISKPART> delete partition override
DiskPart successfully deleted the selected partition.

From the source, they also set an ID, yet that part both did not work nor was it necessary for me.

Now the entire USB stick was deleted:

enter image description here

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