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.
URGENT - disk0s2: I/O error.
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. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.
Save yourself that grief and get a new drive now. Problem fixed after completely reinstalling Mac OS X. So no panic and no hysteria. I just had this experienced recently and I have managed to get it back working to normal. It may well be that the combination of long period of usage and the accumulation of dirt in your computer have caused this error. I'm not an expert, but I've tried most of the proposed solutions online found in forums stopped short of getting anything replaced , so the list below is what I think works for my case.
I don't know how long will this last, though. So as previous poster said, get everything backed up always. This is my experience only and I will not be liable if you damage anything in the process! I had this same problem and thought it would be necessary to replace the disk. The Disk Utility "Repair Disk" feature didn't help. In a fit of desperation I tried erasing the drive and restoring from backup, and I haven't had any disk-related errors since. That was 8 months ago. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
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Resetting port. Aug 4 MacBook—Air—2. JakeGould Shall we assume you don't have a suitable backup that you can simply restore onto a working disk? That's what happends whe people live on the edge. There are sometimes ways to get a failing hard drive back to a somewhat more healthy state, but they still take many hours mostly "unmanned" hours it goes something like this: Get a large fast external hard drive big enough to hold a bootable copy of Mac OS X, and still have more free space than the entire capacity of the failing disk.
Boot from the external drive and unmount the internal drive. I am also unable to start the computer in recovery mode or safe mode, it just gets to the grey mac loading page and stops with the bar half full but never finishes. Hi thanks for all the info here! I get to the root but then I cannot enter any text.
Am I just not giving it enough time to process? I let it run for fifteen minutes. When I ran the Fsck -fy this is the message I got:.
However what I notice is that after ejecting my external HDD the permission problems reappear and I have to reinstall everything using safe boot and the last backup in time machine. Does anyone have any idea if the external HDD or the new ssd or ram creates the problem? Is something failing? Can you help me out with my MacBook Pro? I try to boot fsck on my mac according to your suggestion when it failed to show the HDD.
disk0s2: oxe0030005 (Undefined)
When I put fsck in, it said command not found. What should I do? Thank you. This was a splendid advice. I used it for a Yosemite system disk. Thank you very much! That was easy. The Mac is telling you that once in S. The trick is how you find the partitions names you might have and fsck them.
You sound very impatient, not good for running disk repair. Be patient, it can take a long time if the drive is large, slow, or failing. If you reboot in the middle of fsck running you can damage the disk and cause data loss. I hope you have a good backup handy. Name required. Mail will not be published required. All Rights Reserved. Reproduction without explicit permission is prohibited. Jack Johnsman says:. December 29, at am. Jean says:.
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Repair Your Hard Disk in Single User Mode | Everything Macintosh
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