Disk Utility - Repair Mac OS X without CD Drive / DVD
Because I frequently dual boot between Windows XP and my Mac OS, there comes a time when my Mac OS gets corrupted as well (there's no hard proof that dual boot causes this, but I would like to believe so since I have cross OS read/write operations on both).
Very well, start Disk Utility and uh oh, "repair" disk option is not available. I restart, and worse, the Mac OS startup screen just gets stuck at the circle animated wheel forever. Ok, I don't panic, went to do some searching on another pc, and tried starting Mac OS X with the "shift" keyboard button pressed down (this is said to run the "repair" disk option). Still no luck.
I CAN'T find my Mac OS installer DVDs.... I cannot run Disk Utility off it no matter how much it wants me so.
Mac OS had it all along. We just need to get into some command line stuff, and you thought Mac OS did not have this unglamorous side.
1. Restart your Mac and get into Single user mode by holding down Apple key+S all the way through the boot-up till you see the ugly black screen with text
2. After everything finishes loading, type in fsck -yf (fsck stands for file system check). Remember to press enter after typing that of course.
3. Allow it to run and hopefully, you finally get to see the "Disk X appears to be OK." message.
4. Lastly, type "Reboot" to restart back into Mac OS X
