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I have external hard drive Transcend.

Previously I could work with it without problems , but I did not use it for two month.

Today I tried to connect to my Mac and result :

I can see HD in Disc Utility , but I can't see it in Finder.

Is there a setting to change that would prevent or cause the vipooume to show in finder?

EDIT

Now I get new message when I connected HD to Mac

enter image description here

but anyway I tried to open DiskUtility and execute FirstAid, I got such message

enter image description here

Weird=( How I can check the reason of error and make it work?

  • Have you tried plugging it into a Windows machine? – Allan Sep 7 '17 at 18:30
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There are many reasons why a volume won’t mount: How does Mac OS X decide which volumes to mount? One of my disks doesn't mount at boot

Since yours shows in disk utility, I would either run a verify or repair operation based on if the data is backed up elsewhere. This could be the first sign the filesystem or hardware are failing and when you “repair” a filesystem, sometimes that deletes bad files or causes other data loss.

It could also be that the filesystem check is taking hours and that given enough time, it will mount again rapidly once a full check is done. You can see those check details in the disk utility or possibly in /private/var/log while the checks run.

  • Edited my question, maybe you know how I can make it work? – Aleksey Timoshchenko Sep 2 '17 at 16:38
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If Disk Utility won't fix it you can try a third party disk repair utility.

I use DiskWarrior but there are others.

No guarantees any will work, it just depends on how much the data on that drive is worth to you.

The problem might also be hardware related. EG no disk repair utility will fix it.

If third party disk repair utilities fail you may have to ship the drive off to a data recovery specialist. That can get expensive.

  • That is a good point, but I've found that running Disk Utility from Recovery mode on modern versions of macOS yields better results when attempting to repair a volume. – Jake3231 Sep 2 '17 at 21:05

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