Q: disk0s2: i/o error

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!

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.

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