MacBookAir6,1 disk I/O error...and how I fixed it
nothing gives a college student a heart attack like a boot-looping machine

I’m usually up late, so this is normal:

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It’s late? Only 12:45am haha

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Alright, so let’s use verbose mode to figure out what’s going on. OS X is pretty descriptive with a little -v magic.

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I’ve never seen this before. Let’s try single user mode and fsck -fy /

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** The voume Macintosh HD could not be verified completely.

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It’s worth noting that fsck -drfy / wasn’t able to do anything either.

Time to bring out the El Capitan installer disk. Thanks to DiskMaker X, we had the installer running shortly:

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Attempting to run First Aid using Disk Utility proved absolutely worthless

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This tool used to be so good and reliable… Anyway, looks like a hardware issue with the internal SSD. I really hope not…but always assume the worst.

Let’s see if the filesystem is still readable…

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Oh good, it looks like we can read the files. Yay! You won’t lose anything!

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Took the computer home, busted out cp -R and within about an hour had everything backed up.

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Time to experiment

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Let’s give fsck_hfs -fy /dev/disk0s2 a shot and see what it says:

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This was expected. Wipe it with diskutil eraseDisk jhfs+ "MACHD" /dev/disk0

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…is there hope?

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Apple diagnostics?

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Wiping it with diskutil didn’t help, so let’s give Gparted a go.

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Boots right up with no problem. EFI ftw.

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Created a completely new GPT setup. Attempting to install OS X again:

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Left the apartment for 3 hours and came back to this:

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Reboot with -v aaaaaaand

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I’m about to give up and call it a hardware issue.

Hold on…

There is one thing I have never tried on a disk… zeroing

Hmm…

Pulled the SSD from my MacBook Pro because the Terminal on the installer is annoying:

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Never tried this before…

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Almost done…

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Okay, so now it should be completely blank, no data whatsoever. Repartitioning the disk with diskutil partitionDisk and repairing with diskutil repairDisk now…

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The issue was repairing the volume from before, so we’ll try that next with diskutil repairVolume /dev/disk0s2:

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NO ERROR. Final attempt at installing the system:

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Never give up.

Part 2 Here


Last modified on 2016-04-04

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