However, this drive doesn’t even appear in Disk Management. So, you run Disk Management to check the Z drive’s details and tried deleting it from there. However, when you double-click on it, a window pops up “You don’t currently have permission to access this folder”. Then, you decide to access it to see what there is. After upgrading your computer OS like upgrading Windows 7 to Windows 10 or partitioning a hard drive, there is a chance that you may find a Z drive in File Explorer which is only hundreds of MB.