What does CHKDSK do?

Bah! Okay I have a hard drive going bad so I'm running Windows XP CHKDSK on it. While I'm staring at the little green bar and the announcement of which phase it's on, I was wondereing what each phase did.

Here's a nice like to a MS explanation of CHKDSK phases, and what it does, and how to estimate how long it will take!

http://support.microsoft.com/kb/314835

Here's a short version.

• Phase 1 - Checking files
• Phase 2 - Checking indices
• Phase 3 - Checking security descriptors
• Phase 4 - Checking sectors