Q: Can you fix disk0s2: I/O error errors on your HD?

Don't know if your Mac came with Lion preinstalled or you upgraded, so try either of these two:

boot up with your original install disk (while holding C key), go to Utilities, and run repair disk in Disk Utility.

and/or

Hit Command + R keys and use Lion recovery partition > Disk Utility > repair disk.

If Disk Utility cannot repair the disk, you can try something "stronger" such as Disk Warrior, but there is no guarantee. Your disk may be on the way out.

Important: before you attempt anything: make sure you have a backup!!!!

And, here is something I found googling:

http://hintsforums.macworld.com/showthread.php?t=134145

RoadRunn3r wrote:

 

Now I should hit Command+R on bootup or after?

When you hear the startup tone.

Thanks for stepping in! I was out for my walk...... (and should have been more specific in my answer!!).

No worries, the dog (I'm sitting) had me up at 5:30 wanting his walk. The little begger!

You're sitting on a dog????? No wonder he wants to walk (get you off)!!! 

Glad everything is back to normal - and even more so for getting rid of that worthless piece of (mal)software.

hi there, i am having a similar problem, where I just turned on my Apple Macbook pro. Whenever, I turn it on, the progress bar comes with the Apple symbol and after few secs, it turns off by itself. Safe mode on start up does not work either....After this i then did control r> open disk utility, tried to repair macintosh HD, but it says incorrect block count for file temp583624(it should be 2 instead of 0) volume repair, error, disk utility cannot repair this disk. any ideas?

You'd do better to start a new thread as this one is marked solved and probably won't get much attention.

As regards your issue, if Disk Utility can't resolve the problem you may need to try something like Disk Warrior (paid for app), but there's no guarantee that'll resolve it.

As I say, best post a new thread so your problem gets noticed and hopefully someone will have some useful advice.

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, 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.

It is Fixed!! After trying all possible clean up reboots and even battery disconnection I was giving up. At the end of the day I went to order a new SSD to replace my old MBP early 2011 HDD.

But before going to bed I decided to do a Time Machine restore to my earliest back up. I woke up and there it was, totally fixed! like brand new disk. My new SDD disk arrived today, oops what to do now : }