External hard drive not showing up

Apple Genius bar recently had to wipe clean my hard drive. I reinstalled from my external hard drive using Time Machine (which is partioned between Time Machine and Super Duper).

Yesterday I tried to access Photos but got the message: Photos cannot find the System Photo Library named “Photos Library.photoslibrary”. I opened 'Other' and let the gray wheel spin overnight.

I then looked for the external hard drive in Finder and did not find it. I also tried to use Super Duper but it also could not find.

However I just was able to open Time Machine and it has been backing up.

What to do in order to re-install "Photos" and to access "Super Duper"?

iMac 27", macOS 10.15

Posted on Feb 26, 2020 6:46 AM

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21 replies

David Grant Author

Level 1

25 points

Feb 26, 2020 9:51 AM in response to babowa

For some years I have indeed partitioned the external 3 TB hard drive -- half for Super Duper and half for Time Machine. No problems until now.

David Grant Author

Level 1

25 points

Feb 26, 2020 1:53 PM in response to rkaufmann87

Is there any reason not to partition TWO external hard drives, each one partitioned half-and-half. And then, regularly switch the EHDs, placing one off-site?

rkaufmann87

Level 10

148,624 points

Feb 26, 2020 1:57 PM in response to David Grant

That would work.

David Grant Author

Level 1

25 points

Feb 28, 2020 6:36 AM in response to David Grant

I meant that I did check the "Energy Saver>Put disk to sleep when possible". It was not previously checked.

BDAqua

Level 10

250,379 points

Feb 28, 2020 9:15 AM in response to David Grant

Seems like, some crazy things happening lately where MacOS doesn't see Printers, MNonitors, Drives etc. except on restart!?

I meant that should not be checked to put to sleep.

David Grant Author

Level 1

25 points

Feb 27, 2020 5:39 AM in response to rkaufmann87

I don't know what's going on with the external hard drive. Time Machine and SuperDuper seem to load randomly (I see them in the 'Location' in Finder).

Last night I left the computer in Sleep mode with both of them showing.

This morning when I woke the computer I get these messages in the upper right of the screen.

This shouldn't happen just by putting the computer in Sleep mode, should it?

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External hard drive not showing up