|Cause for C: is dirty message:|
Chkdsk turned on the dirty bit for two main causes - a software problem caused by improper shutdown of Windows, or a more serious hardware problem that can indicate a failing hard drive.
If your file system is NTFS, you can turn off the C: is dirty bit by following this procedures:
1. Open command prompt.
2. Type in chkntfs /x C:. This will prevent chkdsk from scanning drive C: at startup
To reset it back to normal, again open command prompt and type in chkntfs /d