View Full Version : ML on MBP July 2009 fails to boot - disk0s2 I/O error

Feb 11, 2013, 02:38 AM
Hi guys!

Sunday morning I switch on my MBP and went to prepare breakfast - when I returned to the desk - there was no login screen - the grey boot screen with apple log and small spinning "gear" was still spinning. Took a shower and when I came back - nothing had changed -seems to be stuck at the boot screen.

The evening before, there was just a normal shut-down. Before closing, I just ran update from the app store and moved a Lightroom 4 gallery to an external hard drive.

I ran Disk utils to scan the main hard drive - there were a few rights on 2 folders "out of order", but easily fixed. The hard drive scan said "no errors" and that the "volume is ok".,

I rebooted - but still same problem - no error messages displayed. :mad:

Any tips on debugging this? Does ML have a "verbose" mode???


Feb 11, 2013, 08:01 AM
Ok, I manage to boot in the verbose mode - then I get some disk0s2 I/O errors :mad::mad:

I then tried single user mode and ran: fsck -fy getting the final message "The volume Macintosh HD appears to be OK".

Now what?

Feb 11, 2013, 12:15 PM
Now tried Diskwarrior 4.4, the graph/directory structure was rebuild. The SMART tool says that the hard drive i functioning normally.

For some reason, the "Repair Disk Permissions" option is greyed out., claiming unsupported OS X version - but Mountain Lion is supported by 4.4. :confused::confused::confused:

I noticedthat in verbose boot mode, I am getting this:

BootCacheControl: Unable to open /var/db/BootCache.playlist: 2 no such file or directory

Then I again get a bunch of disk0s2: I/O errors.