I have recently re-installed Windows XP which consequently reformat my hard disk. When I plug in my external hard disk USB (which was working fine prior formatting the PC), it does not shows up in 'My Computer'. When checking Device Manager, the device is working properly. I have verified on Disk Management, the external hard disk is there but with no Drive letters and paths, it mention "unallocated". It does not allow me to give it a drive letter. During the re-installation on Windows, the external HD was connected to My PC. The external HD is an Apollo 2.5" portable hard drive 250GB. On the "USB device properties", under volume tab, the partition style is: Master Boot Record, capacity:238,473 MB, Unallocated space: 238,473 MB, Reserved space: 0 MB and status: Online Can anyone help me on the above issue. I have some important data on it. Has the disk been erased?