4 Replies Latest reply: May 10, 2013 7:00 AM by WZZZ
dean14 Level 1 Level 1 (0 points)

iMac would not boot up past Grey Apple screen on repeated attempts.  tried to reboot in safe mode with tracking on and after several lines of boot up code it stopped and I get a reparated disk0s2: I/O error. message.

 

What does this mean?

  • 1. Re: disk0s2: i/o error
    vea1083 Level 3 Level 3 (685 points)

    dean14 wrote:

     

    iMac would not boot up past Grey Apple screen on repeated attempts.  tried to reboot in safe mode with tracking on and after several lines of boot up code it stopped and I get a reparated disk0s2: I/O error. message.

     

    What does this mean?

    I would suggest you to see the following Apple Support Article:

    http://support.apple.com/kb/TS1417

     

    Best!

  • 2. Re: disk0s2: i/o error
    dean14 Level 1 Level 1 (0 points)

    Thanks for the suggestion.  I ran the fsck check and if did not finish.  It stopped in the ** Rebuilding catalog B-tree section.  Kept repeating disk0s2: I/O error. 

  • 3. Re: disk0s2: i/o error
    Samurai2k Level 1 Level 1 (0 points)

    kernel[0]: disk0s2: I/O error.

     

    My iMac starts up slow and often stops working during the day after these errors.  I run the Disk Utility frequently and it never finds any errors, but it is only a bandaid. How do I fix the issue ?

     

     

    My iMac

     

    24-inch, Early 2008

     

    Processor  3.06 GHz Intel Core 2 Duo

    Memory  4 GB 800 MHz DDR2 SDRAM

    I can not add anymore physical ram

     

    Graphics  NVIDIA GeForce 8800 GS 512 MB

    Software  OS X 10.8.3 (12D78)

     

     

    kernel[0]: disk0s2: I/O error.

  • 4. Re: disk0s2: i/o error
    WZZZ Level 6 Level 6 (12,225 points)

    The I/O error and the other symptoms strongly suggests the drive is failing. First thing is to make a backup immediately.

     

    After that test with the free demo of SMART Utility.

     

    http://www.volitans-software.com/smart_utility.php