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Mac kernel disk0s2 i/o error

If the disk has the "S. T" self-diagnosis feature, look at the disk information at the bottom of the window.


  1. disk0s2: I/O error even after new disk fitted. Ideas?.
  2. Disk0s2 I/O error.
  3. Apple Footer.

If the status is "Failing," back up the disk and replace it. To verify the disk, click "First Aid" and click "Verify Disk.

Hint Options

If Disk Utility returns an error on a non-system partition, select the partition and click "Repair Disk. If you can't repair the problem and haven't recently backed up your data, back up immediately to another drive. To back up the drive using Disk Utility, drag the partition from the left side of the window into the "Source" box, then drag the disk you want to copy the partition to into the "Destination" box.

To replace your drive, find your model's instructions on removing and installing a hard drive.

Apple uses standard disk sizes, and you can format your new disk by booting with the System CD, opening Disk Tools, clicking "Partition" if you want more than one partition on the drive, or clicking "Erase" to format a single partition. Hard disk failure is a common problem. Prepare for it with the expectation that your disk may fail at any time. Time Machine makes incremental backups to an attached external drive, and when you must replace the disk, you can copy everything back from your Time Machine backup, including your system settings and preferences.

Check your disk periodically with Disk Tools or a third-party utility to fix small problems and get early warnings of big ones.

I/O Error Log on a Mac

Michael Cox writes about lifestyle issues, popular culture, sports and technology. In a career spanning more than 10 years, he has contributed to dozens of magazines, books and websites, including MSN. Search Glass x. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in.

Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site. Click here to Register a free account now! Started by Start , Dec 11 Please log in to reply. Male Local time: I have a friend that has a sick Macbook. His Macbook model is: MacBook inch, Early His Macbook cannot boot.

disk0s2: i/o error - Apple Community

When the power button was pressed, the grey apple logo and the spinning thing appears. In addition, there is a progress bar underneath. I waited till the progress bar disappears, but it automatically shuts down after that. I tried to restart normally, but the same thing happened. I tried removing the battery and holding down the power button for 20 to 30 secs, but it did not work. I tried booting into the verbose mode, and "disk0s2: Here's a section of the log: Is there a way to retrieve the files inside? How can this be fixed? Norwich, Connecticut. I am going to be serious when I say I have zero back-ground experience with Macintosh computers or their hardware.

Solution Disk Erase Failed with error Couldn't unmount disk mac

But based on the errors I see that you posted above, it appears to me like you may have either a corroded contact on the hard drive or motherboard, that connects the drive to the motherboard. I would try disconnecting the cable at both ends and re-connecting them, lets see if this corrects the problem, it certainly wouldn't hurt and may resolve the problem.

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