The only thing it will let me do is booting to Safe Mode. After running /sbin/fsck_hfs -drfy /dev/disk0s2 it returned with an incorrect number of extended attributes (it should be 486802 instead of 486801) and disk0s2: i/o error. **the volume macintosh could not be verified completely.**

Running the command once more it returns:

**the volume macintosh could not be verified completely.**
volume check failed with error 5
volume type is pure HFS+
primary MDB is at block 0 0x00
alternate MDB is at block 0 0x00
primary VHB is at block 2 0x02
alternate VHB is at block 623463230 0x25294b3e
sector size = 512 0x200
volumeObject flags = 0x07
total sectors for volume = 623463232 0x25294b40
total sectors for embedded volume - 0 0x00
checkHFS returned 5, fsmodified = 1
*****the volume was modified *****
doing update / reload mount for / now

sw_vers: Mac OS X 10.9.5

I don't know what to do now. I really am trying to do this myself without spending any money or as little as possible. And I cannot do anything that will wipe out all of the info that is on it.

  • The key there is the error "volume check failed with error 5" This is more often than not a physical hard drive failure - meaning you will have to get a new drive. I wrote an answer that is applicable to your question. Also, you might want to take a look at Repair disk from single user mode (fsck fails) as it is vert similar and relevant to your situation.
    – Allan
    Commented Aug 31, 2016 at 22:54
  • Also you should check your drive's SMART status to verify if it has any errors. Issue this command in Terminal: diskutil info disk0 | grep -i smart and post the results.
    – Allan
    Commented Aug 31, 2016 at 22:58

1 Answer 1


I/O errors are usually bad news- often a sign of failing hardware. :(

If you don't have a backup already be sure to make one ASAP. For example, try booting in target disk mode (hold the T key while starting up) and connecting to another Mac. From there make a copy and try running Disk Utility to repair the volume.

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