If you are not familiar with Diskpart, you can also use a free partition manager with a clear interface to do this. Since this method involves complete deletion of your USB drive and all the operations cannot be canceled or undone, be extra careful while you do it. Then you can format unallocated space on your USB drive easily. For example, to create a 3000MB partition, run this command "create partition primary size=3000".Īfter a little while, Diskpart will succeed in create a partition. If you want to create more than one partition on the USB drive, you specify the partition size referring to the following syntax: create partition primary. Step 5: type "create partition primary" to create a primary partition. Step 4: Type "clean" to delete all volumes and partitions on the selected disk, which is the USB drive from here. From here, the disk number of the USB drive is 2, so just type "select disk 2" command. Step 3: Run "select disk " to select the USB drive. Step 2: Run "list disk" command to display all the online disks with a specific disk number on your computer. Step 1: connect the USB drive you are having a problem with to your computer, and type “diskpart” in the Run dialog or search box, and press Enter to open Diskpart utility. Before you get started, backup data because incorrectly operations with Diskpart may cause permanently data loss. Then you can switch to another tool named Diskpart that can definitely help you to reclaim the lost space on your USB drive.
In case you delete something essential to your system, Disk Management cannot delete or format some system related files, so you may find there is no way to put the unallocated space in use. The most simple and effective method is using Disk Management. When this situation happens to you, there is no need to worry, because there are many ways to solve the USB drive showing less space error.
Using some third party software inappropriately or an unsuccessful formatting may also cause inaccessible portion on your USB drive, which is shown as unallocated space. Some operating system (OS), such as Chrome OS and Linux, will change the partition system of your removable device, so there will be little free space on your USB drive.
The lost space on USB drive often occurs after trying to burn a system to the USB drive. Before you manage to recover unallocated space on the USB drive, you may want to know how this happened. You will find out that the lost space is shown as unallocated.
Then you open Disk Management, which is a Windows built-in utility, to see what really happens to your USB drive. When trying to use your USB drive, you plug it in your computer and open My Computer, only to find that much space on the USB drive is lost, leaving only a few megabytes available free space.