More than 3 Gigabytes of free space was lost in thin air ! I opened Windows Explorer, right clicked the USB drive icon, selected properties and found that the available space shown was only 250 MB. The other day I was trying to burn an Image on a USB drive and ran into a strange problem.Īfter using a freeware image burner to burn a portable Operating system on my 4GB removable drive, I found that my USB drive has lost all it’s space. How To Use DiskPart Command To Recover Missing Or Unallocated Space On A USB Drive