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Event ID: 1001 Source: Winlogon

Source
Level
Description
Checking file system on <drive>
The type of the file system is <filesystem type>
Volume label is <volume label>

One of your disks needs to be checked for consistency. You may cancel the disk check, but it is strongly recommended that you continue. Windows will now check the disk.

<Corrections Data>

Windows has made corrections to the file system.
Comments
 
This event could occur if you check your hard disk drive with CHKDSK in Read Only mode and it has files currently open or in use by Windows NT. See ME109524 for details.

See MSW2KDB for additional information about this event.
As per Microsoft: "This problem occurs because if Chkdsk is run against an NTFS volume, Chkdsk.exe may report that security descriptors are in the database that are no longer referenced by any file or folder and that it is removing them. However, Chkdsk.exe just reclaims the unused security descriptors as a housekeeping activity, and it does not actually fix any kind of problem". See ME255008 and ME218461 to fix this problem.
Event logged by an automatic CHKDSK upon reboot.

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