How to Fix USB Drive that isnt showing full storage space in Windows

Solution 1. Use Diskpart to make pen drive show full space

The most simple way is to delete paritions on pen drive. Generally, you can use Windows Disk Management, but it does not allow you to delete volume on removable disk or delete/format system related partition. Thus, it comes to another Windows native tool named Diskpart.

Step 1: Connect the pen drive to your computer and make sure it is detected.

Step 2: Search “Command Prompt” in the Start menu. Right click its shortcut and select “Run as administrator”.

Step 3: Type “diskpart” → Enter.

Type Diskpart


Step 4: Type “list disk” → Enter. It will show you disks connected to the computer.¬¬

List Disk



Step 5: Type “select disk #” → Enter. (Replace # with the number which is identified as the pen drive in your computer.)

Select Disk 2

Note: Be careful when entering the number, otherwise everything on the disk you choose will disappear.



Step 6: Type “clean” → Enter.



Step 7: Type “create partition primary” after you see “Diskpart succeeded in cleaning the disk”. If you want to create more than one partition on the pen drive, specify the partition size by this syntax: create partition primary size=#. For example, to create a 4000MB partition, run the command “create partition primary size=4000”.

Create Partition Primary



When finish, leave the command window then you can format the pen drive easily through Disk Management as you wish. Of course, you can also format drive with Diskpart by executing command “format fs=”.

However, using Diskpart to solve USB drive shwoing less space takes certain risks, especially for computer green hands. It is inconvenient to distinguish which disk is exactly the pen drive. Besides, if typing something wrong in the command window, no one could guarantee what will happen next. So here introduce another useful and free partition manager.