Somehow my PC has acquired a logical drive separate from the one on which the system files are stored. In effect it has bisected the hard drive and refers to the empty half as 'data'. The system half contains 'my documents' as well as programs and is too full to defragment. I'd like to re-merge the hard drive and give back the space to the system half. There is a 'Windows' option to delete the logical drive under 'disk management' but all I know is that this will lose any data under that drive letter. Does anyone know why my hard drive was partioned into 2 halves and also whether I can simply delete the logical drive in order to regain all the space under the system drive? Data loss would not be a problem.