Repair the primary volume on a Mac
15 August 2009 | Posted by Jeffrey Barke | No comments
As I do weekly, I ran the "Verify Disk" function of Mac OS X's Disk Utility.app this morning. For the first time, I received the message Volume needs repair.
Since this was the primary volume (startup disk), the "Repair Disk" button was grayed out, and, of course, I didn't have a clue where the Mac OS X install disc is. Not sure how to fix it, I turned to Google. Turns out the repair process is quite easy:
- Turn off the computer.
- Restart in single-user mode by pressing the power button to turn the computer on and immediately pressing and holding the Command (Apple) key and the "s" key.
- At the command-line prompt, type:
/sbin/fsck -fyand press Return. - fsck will run through five "phases." If it makes any repairs, it will display
***** FILE SYSTEM WAS MODIFIED *****If you see this message, repeat step 3 until you see** The volume (name_of_volume) appears to be OK - At the prompt, type
rebootand press Return.


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