| Note Using chkdsk /f or chkntfs /c to schedule a Chkdsk against a volume and using chkntfs /x to exclude a volume from being checked override each other. This gives you complete control over whether Chkdsk is run against a particular volume unconditionally, conditionally, or not at all during the startup process. The last command that you issue sets or resets the registry entries accordingly.
If you schedule Chkdsk to run the next time the system starts, Chkdsk does not set the dirty bit on an in-use volume to check the volume during the next start-up process. Instead, Chkdsk sets a registry entry to tell Autochk to run against that volume. The dirty bit is only set by the file system when it detects a problem.
If you schedule Chkdsk to run during the start-up process against a volume, and during the startup process, you decide to bypass Autochk by pressing any key, Autochk does not run against that volume, and it removes the registry entry so that Autochk is no longer scheduled to run against that volume in the future. In certain situations, it may be helpful to bypass running this Chkdsk.
To change the length of time that Windows waits before running Autochk so that you have enough time to bypass running it by pressing any key, locate the following registry subkey:
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