How to Lock a drive in Windows XP?

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LOCK [drive:]

drive: Specifies the drive that needs to be locked.

UNLOCK [drive:]

drive: Specifies the drive that needs to be unlocked.

Examples

lock c:

Lock the C: drive

When typing the above command you will receive the below prompt.

WARNING: The LOCK command enables direct access by programs
that can CORRUPT file names and/or DESTROY disk data, resulting in the
loss of files on your disk.

Are you sure (Y/N)?

unlock c:

Unlock the C: drive

It is important to know that if errors occur indicating that a process, such as fdisk or a setup of a new program or operating system, cannot continue because the hard disk drive is locked, that using the unlock command will resolve this issue.