Locks the volume and fixes errors on the volume. If Chkdsk cannot lock the volume, it displays the following message before it prompts you to schedule Chkdsk the next time the system is restarted:
Chkdsk cannot run because the volume is in use by another process. Chkdsk may run if this volume is dismounted first. ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID. Would you like to force a dismount on this volume?
(Y/N)
If you schedule Chkdsk to run the next time the system is started, Chkdsk does not set the “dirty bit” on an in-use volume to check the volume at the next startup process. (A “dirty bit” is a bit on the physical disk that is used by the operating system to mark a volume as corrupted and in need of corrective actions.) Instead, it sets a registry entry to tell Autochk to run against that volume. The dirty bit is set by the file system itself only when it detects a problem. (Versions of the chkdsk /f command in Windows NT 4.0 and earlier set the actual dirty bit.)
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