How to Fix Your USB Pen Drive when it's Showing Less GB Disk Space

Fix USB Pen Drive is Showing Less GB Disk Space

Is your USB flash drive suddenly showing less GB in disk space than actual?

Did your 16GB or 8GB USB pen drive became 3GB, 0.99GB, 64MB, 30MB, or 4MB?

Is your USB pen drive showing unallocated space?

Then you are on the right page, because here...

...I will show you step by step how to fix these problems without installing extra software, but by using two tools that are built-in Windows XP, Vista, 7, 8 ,8.1 and 10.

This tutorial will work for all USB pen drive brands such as Kingston, SanDisk, Toshiba, Lexar, HP, PNY, Transcend, Freecom, and all other brands.

Restore USB Flash Disk Back to Full Capacity

Important! Copy all data (documents, pictures, videos, music, etc...) from the USB flash drive to another USB pen drive or hard drive, because all data will be erased.

Warning! Diskpart is a very powerful tool. You need to be 1000% sure that you select the right disk, because if you delete the partition on the wrong disk you might delete the Windows partition or another important partition.

1 Open Windows "Command Prompt".

A few ways to open "Command Prompt":

  1. Click on the Start menu button, choose "Run", enter "CMD" and click on "OK".
  2. Click on the Start menu button, enter "CMD" into the search bar and hit enter (keyboard).
  3. Windows 10: right-click on the Start menu button and choose "Command Prompt (Admin)".

2 Enter the following command:

diskpart

Open Diskpart

3 Hit enter (keyboard).

4 Enter the following command:

list disk

List Disk Diskpart Command

5 Hit enter (keyboard).

Now you will see a list with all the disks that are on your computer.

Important!!! Take a good look and make sure you know exactly which one your USB pen drive is. In the example on this page is "Disk 1" my USB flash drive, but this doesn't mean that "Disk 1" is also your USB pen drive.

6 Enter the following command, but replace "X" with the disk number you want to select:

select disk X

Select Disk Diskpart Command

7 Hit enter (keyboard).

8 Enter the following command:

list partition

9 Hit enter (keyboard).

Now you will see the partition(s) on the selected drive.

10 Enter the following command, but replace "X" with the partition number you want to select:

select partition X

Select Partition Diskpart Command

11 Hit enter (keyboard).

12 Enter the following command:

delete partition

Delete Partition Diskpart Command

13 Hit enter (keyboard).

If you get the message: "Diskpart successfully deleted the selected partition.", then continue with the following steps.

But:

If you get the message: "Cannot delete a protected partition without the force protected parameter set", then visit from HowToGeek (link opens in a new window).

Now it's time to close DISKPART and Command Prompt.

14 Enter the following command:

exit

15 Hit enter (keyboard).

This will close diskpart.

16 Enter the following command:

exit

17 Hit enter (keyboard).

This will close Command Prompt.

Disk Management

Warning! Disk Management is a very powerful tool. You need to be 1000% sure that you select the right disk, because if you change, format, or delete the partition on the wrong disk you might delete the Windows partition or another important partition.

18 Open Windows "Disk Management".

A few ways to open "Disk Management":

  1. Click on the Start menu button, enter "disk management" into the search bar and hit enter (keyboard).
  2. Click on the Start menu button, right-click on "Computer", choose "Manage" and click on "Disk Management" located on the left side.
  3. Click on the Start menu button, choose "Control Panel", open "System and Security", open "Administrative Tools", open "Computer Management" and click on "Disk Management" located on the left side.
  4. Windows 10: right-click on the Start menu button and choose "Disk Management".

19 Locate your disk. Usually it's easy to locate, because it will be shown as "Removable" with unallocated disk space.

20 Right-click on the disk (your usb drive) and choose "New Simple Volume...".

Create New Volume in Windows Disk Management

Now the "New Simple Volume Wizard" will open...

21 Click on "Next".

22 Check if the maximum disk size is selected and click on "Next".

Disk Management Check Maximum Disk Space

23 Select a drive letter (if you want) and click on "Next".

24 Make sure "FAT32" is selected as "File system".

25 Go to "Volume label" and enter a name.

Disk Management Format Options

26 Click on "Next".

27 Click on "Finish". Windows will create the new volume. That's it.