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Ways to use Unallocated Space on USB Drive

USB flash drives are the portable memory devices that enable easy transfer of all your data between computers. They are convenient to use and hence most of them even use them for booting the computer. However, they do have some problems while sharing. One such potential problem is unallocated memory, in which a portion of your USB drive memory becomes inaccessible and useless either due to unreliable third party diagnostic tools or an incomplete reformatting of your USB drives.

Until and unless the unallocated disk space takes up larger section of your USB drive space it is not a problematic issue. Luckily, there are many ways in which you can effectively utilize this unallocated space on USB drive, among them two of the most effective methods are as listed below:

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Method 1: Using Windows Disk Management Program

  • Connect your USB drive to your computer and go to “Start” and click on it to open the Start menu. Then move towards “My Computer” and right-click on it
  • Now, just choose the “Manage” option from the drop-down menu offered, with this the “Computer Management” window will open up
  • In this window, you could see many categories among them go to “Storage” category and then select “Disk Management” option
  • Here a list of all the drives on your computer will be displayed, including your flash drive that is located on the right side of the Disk Management window
  • Select the drive representing your USB drive and right-click on it; a drop-down menu appears. Then choose the "Delete Partition" option.
  • By doing this entire USB drive will be created as one portion of unallocated space
  • Again right-click on the USB drive and from the drop down list select the "New Partition" option
  • Now, the “Partition Wizard” will open up wherein just select the partition type that you want to create like primary, extended or logical drive.
  • Then choose the partition size and assign a drive letter to the USB drive; else the disk Management program will assign it automatically. Now just click on “Finish” to complete the process.

With this all your unallocated space on the USB drive will be released and you can utilize it now. However, before doing this just take backup of your entire USB drive data.

Method 2: Using DiskPart in command line

Windows offers another tool called DiskPart that helps you to release all unallocated space on the USB Drive. This DiskPart tool helps you in accessing all the details related to your Volumes and partitions and even helps you in deleting and creating thee partitions, etc.

Step 1: Once you connect the USB drive to your computer run Windows command line (Press Windows + R and type cmd in the Run dialog) and in the command prompt type diskpart

Note: If you are asked for the administrator permissions then provide the required password and other details.

Step 2: Type the command list disk to find your USB drive’s number, it should be the same as disk’s number in Computer Management tool.

DISKPART> list disk

Disk #   Status         Size           Free     Dyn  Gpt

Disk 0    Online       298 GB      0 B

Disk 1    Online      7509 MB    6619 MB

Step 3: Now, choose the drive to work with based on the disk numbers listed, here the USB drive number is 1. Then type select disk <disk number> command.

DISKPART> select disk 1

Disk 1 is now the selected disk.

Step 4:  Clean all volumes and partitions on that disk selected by using the clean command


DiskPart succeeded in cleaning the disk.

Step 5: Now create a primary partition by using the commands create partition primary.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.


Note: If your USB drive shows full but you're not able to access data, then read this article on How to Restore USB drive back to its original state.

That’s it; now you should be able to format your USB drive easily. With this, all your unallocated space on the USB drive will be made accessible and you can effectively utilize it. Since both these methods involve cleaning and deleting the partitions and volumes, it is recommended to have a complete backup of all the USB drive data. However, even if you lose the data due to partition deletion with the aid of Remo Recover software you can easily recover files from USB drive effortlessly.

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Tony Landry

Tony Landry is a Web Content Editor at Remo Software. He loves to write, edit, and manage content for users trying to troubleshoot and fix problems on Windows, Outlook, storage drives and Cloud storage networks.

He has published more than 200 articles in Remo Software blog. He actively engages in research and problem-solving techniques to consistently generate great web content. Fixing various hardware problems on computer and storage devices along with a great knack for fixing Outlook errors, Tony is also the fun-time IT guy for all his work friends. He lives in the San Francisco Bay Area and enjoys cycling.

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