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  1. #16
    imac keeps crashing, rebooting?
    MacInWin's Avatar
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    DU cannot fix the drive from which you are booted. To enable repairs, boot from an external drive and run DU from there, or boot into Recovery (If you have it) and it can fix the main container because it is no longer the boot drive. If it's APFS, Tech Tool won't do anything. It's not compatible, despite what the developer says.
    Jake

  2. #17
    imac keeps crashing, rebooting?
    macgig's Avatar
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    tech tool pro is not finding anything odd, all the tests I ran passed. good to know Macinwin thanks.


  3. #18
    imac keeps crashing, rebooting?
    macgig's Avatar
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    booted from external drive, ran DU.... .same error and it's not fixing it. its not repairing it....

    warning: found physical extent corruption but repairs are disabled





  4. #19
    imac keeps crashing, rebooting?
    chscag's Avatar
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    if its the hard drive going bad, I've never had one die this soon on any mac i've owned. 5 years is all I get out of it? it is mechanical so I guess that is possible.
    I've had hard drives go bad sooner than that. My 2011 iMac was 2 years old when the hard drive failed. Luckily I had Apple Care and it was replaced for free.

    Getting back to your problem.... it does sound like your drive is failing so be sure to keep up with your backups. Both Time Machine and CCC are recommended.

  5. #20
    imac keeps crashing, rebooting?
    MacInWin's Avatar
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    Quote Originally Posted by macgig View Post
    booted from external drive, ran DU.... .same error and it's not fixing it. its not repairing it....

    warning: found physical extent corruption but repairs are disabled



    Just to be sure, the version of OS on the external is the same as the version on the internal? DU is updated with the OS, so you need the same DU as the internal. Particularly with APFS changes at Mojave/Catalina. If that is the case, the drive is dead/dying and chscag's advice is about al you can do. Backup what you can, replace the drive. You could do a backup, boot from an external installer, try formatting the entire drive and then creating the APFS container and reinstalling from scratch. Test the drive again and if the error are corrected, do another reinstall and use Migration Assistant at the first boot to get your system back like it is now.
    Jake

  6. #21
    imac keeps crashing, rebooting?
    Randy B. Singer's Avatar
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    If you suspect that your hard drive is failing, I recommend that you run:

    Apple Diagnostics
    How to use Apple Diagnostics on your Mac - Apple Support

    You might also try this excellent product, but I don't know if it is compatible with an APFS drives:

    DriveDX - free demo
    DriveDx - the most advanced drive health diagnostics and monitoring utility
    Randy B. Singer
    Co-author of The Macintosh Bible (4th, 5th, and 6th editions)
    Mac OS X Routine Maintenance http://www.macattorney.com/ts.html

  7. #22
    imac keeps crashing, rebooting?
    chscag's Avatar
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    You might also try this excellent product, but I don't know if it is compatible with an APFS drives:

    DriveDX - free demo
    DriveDx - the most advanced drive health diagnostics and monitoring utility
    It is compatible. I have the latest version and I use it to check my Apple SSD on my iMac which runs Catalina.

  8. #23
    imac keeps crashing, rebooting?
    macgig's Avatar
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    I ran DriveDX... it says the drive is ok. guess I'll keep and eye on it and keep good backups. lol

    OS is the same on both drives... have to wonder if the power supply is slowly dying? I'll just keep an eye on it for now.
    Last edited by macgig; 04-05-2020 at 04:14 PM.


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