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TOPIC: External drive not recognized for Volume Rebuild; how do I prevent issues?

External drive not recognized for Volume Rebuild; how do I prevent issues? 24 May 2016 13:52 #7236

Checkmate is telling me I have a volume structure error on an external drive but Apple's DiskUtility says it's fine and TechTool doesn't recognize the disk for a Volume Rebuild. I reformatted the drive to see if that would help, but it still won't show up in TechTool. I'm running TechTool 8 with latest updates. Please advise.

Also, I'm fairly confident the volume is getting messed up because it's a USB drive and my Mac keeps going to sleep without properly unmounting the drive. I've turned off put hard disks to sleep and installed Mountain in an attempt to control. I also tried using Western Digital's controls to put the drive to sleep periodically. Nothing has helped. Short of never putting my Mac to sleep, I'm not sure what to do. I've searched the internet for answers but everything I've tried has failed. Can anyone help?
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External drive not recognized for Volume Rebuild; how do I prevent issues? 24 May 2016 14:41 #7237

The USB drive should be formatted by Disk Utility with a GUID partition map and a Mac OS Extended (journaled) volume.

Sometimes, when Checkmate reports a volume structures failure, the disk directory errors are minor ones that are repaired by the operating system when the volume is next mounted, such as during a restart or reboot. If the volume was not properly unmounted, as you have reported, then it would be automatically checked and repaired by a process called fsck_hfs the next time is mounted. The fsck_hfs process is what Disk Utility uses to diagnose and repair disk directories.

Whatever the reason is for the volume not showing up in the Volume Rebuild tool, it is not because the volume is unmounted. The Volume Rebuild tool unmounts a volume before it begins its tasks.

Please send a message to This email address is being protected from spambots. You need JavaScript enabled to view it. , including a link to this thread. You will receive a reply by email, and may be asked to send in some log files and an Apple System Information report. Thank you.
MicroMat Inc
Makers of TechTool
Last Edit: 24 May 2016 14:41 by micromattech3.
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