Locks a drive, enabling direct disk access for an application.
Can be used to lock a disk drive for direct disk access when
using commands like: UNDELETE
To unlock a disk drive for direct disk access use: UNLOCK
It is necessary to LOCK the disk drive letter PRIOR to using commands like UNDELETE or you will have to reboot your computer with CTRL+ALT+DEL when you receive:
"Windows has disabled direct disk access to protect your long filenames"