- iMac doing fsck_hfs on every start up - Ars Technica OpenForum
- Repair Your Hard Disk in Single User Mode
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This could be good to get a manual backup by cp. There are other modes to try backups if single-user mode is not available. Probably will point you towards the error due to which you are not able to go into Single User mode. Shift-key Safe mode T Target Disk mode: This works with FireWire. And now Thunderbolt as well. Not being able to mount the drive, I could not copy my files before trying the fix by any traditional means.
What I did do was load Data Rescue from CD and used the clone function to clone the broken HD to a FireWire external - for some reason it could see the drive and execute the clone. I then tried the fix on the clone first. Disk Utility can verify your computer's startup disk volume without starting up from another volume. Here are Apple's instructions. This feature is called 'Live Verification. You can't repair your startup volume while your computer is started from it. Very important: The thing which can tell if it works is if you are getting a different output of the Repair in successive runs.
So log the successive runs and if the error reported is changing in successive runs, it is likely that REPAIR is fixing some problems in each run and it could be possible that using REPAIR repeatedly could solve your problem. At the command line, type: If this message appears, repeat the fsck command you typed until fsck tells you that your volume appears to be OK first-pass repairs may uncover additional issues, so this is a normal thing to do.
About the -y flag: Tells fsck that you want to answer 'yes' to all questions about fixing, repairing, or salvaging information. This is the optimal approach, as answering 'no' to any question causes fsck to stop. You cannot determine that all necessary repairs have been made until fsck completes and gives its final report. The -f flag forces fsck to check 'clean' filesystems when preening. Try many times.
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DiskWarrior isn't, strictly speaking, a data recovery tool, but it's 'scavenge' mode does an excellent job of retrieving data from a file system even if it can't be entirely repaired. A good data recovery tool is Data Rescue. Hardware level verification even if your volume gets fixed by above: Or is the disk highlighted in red?
iMac doing fsck_hfs on every start up - Ars Technica OpenForum
If so, then the disk is dying, replace the hard drive, and hope your backups are recent. Even if your Disk Volume error is fixed, it is imperative to do the HW test. The endgame: If you need to replace your HD manually, and are out of warranty, try finding a video guide on YouTube for your model. For example, here is one for MacBooks. Concluding useful info: Summary of boot options: Single user mode: Shift-key while booting see full info here.
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- iMac doing fsck_hfs on every start up.
Booting from CD or other boot devices: Use the Option key while starting to see all the boot options Dealing with the mounting blues: To know which device was just inserted, at the command line type: To mount an external HD having the FAT32 filesystem if this is all you have to backup with in an emergency , type: OK, this is a long guide, many parts of which may be found in previous hints.
It seemed like a good summary of many of them. If you spot any errors, or have handy additions to make, please post them in the Comments. The following comments are owned by whoever posted them. This site is not responsible for what they say.
Repair Your Hard Disk in Single User Mode
Miniguide to fixing Volume-Filesystem errors Authored by: Auricchio on Apr 29, '11 Doc-Izzy on Apr 29, '11 Doc-Izzy on Apr 30, '11 Search Advanced. From our Sponsor Latest Mountain Lion Hints Click here for complete coverage of Lion on Macworld. User Functions Username: What's New: Hints 1 new Hints in the last 24 hours Comments last 2 days No new comments Links last 2 weeks No recent new links.
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My suspicion is it was too much for my memory and then the crash began. Same screen it gets stuck on. Thanks, it seems this solved my problem File system check exit code is 8, now zero. Hey, Could someone help me!!! My mac book pro from is blocking when the apple appears. I tries to reboot all the devices but no success. Hey, please help! Volume name: TimeWarp Volume type: Physical Volume BSD device node: USB Device tree path: No Is case-sensitive: No Is encrypted: No Can be verified: Yes Can be repaired: Yes Bootable: No Journaled: No Disk number: Media type: Generic Ejectable: Yes Solid state: No Parent disks: This really worked well for me — fsck fixed the hierarchy error on my disk wich Disk Utility could not fix.
I have a MacBook that was reset to factory mode but now when trying to set it up it only goes so far into the setup to setup user name then starts all over again. Help please thanks Jean. Using an external firewire drive boot to High Sierra, and internal drive shows, then disconnects repeatedly. Name required. Mail will not be published required. All Rights Reserved.
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