New Mac Mini, Sandisk was working fine, now it's not mounting

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Level 1

4 points

New Mac Mini, Sandisk was working fine, now it's not mounting

SanDisk Extreme Pro Portable SSD V2 2TB not mounting or showing up in Finder all of a sudden. Not sure if it was due to recent Sequioa update or what.

Shows up in disk utility and diskutil list.

Brand new Mac Mini 2024.

I tried rebooting, unplugging power, new cable, port, etc. I can see the drive as. a volume Mac OS Extended (journaled) in disk utility and 'first aid' works successfully. Clicking mount does nothing.

I have a seagate that is working fine.

Any other ideas?

Mac mini, macOS 15.2

Posted on Dec 14, 2024 06:15 AM

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Answer 1

den.thed

Level 10

88,960 points

Dec 14, 2024 09:14 AM in response to GMSANDISK

See if re-formatting the SanDisk Extreme Pro Portable to APFS instead of Mac OS Extended (journaled) helps.

File system formats available in Disk Utility on Mac - Apple Support

Just make sure that you copy any data on the SanDisk, to the Mac or another external drive before re-formatting it.

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Answer 2

GMSANDISK Author

Level 1

4 points

Dec 15, 2024 03:30 AM in response to den.thed

Thanks den.thed!

Used disk utility 'edit-convert' function to change to APFS and that worked! All files intact.

This is the only issue I've had so far in upgrading my mac mini from the 2012 version, hopefully I will be good to go for 12 more years!

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Answer 3

den.thed

Level 10

88,960 points

Dec 15, 2024 07:04 AM in response to GMSANDISK

GMSANDISK wrote:

Used disk utility to convert to APFS and that worked! All files intact. Thanks den.thed.

You're welcome.

My seagate time machine drive is on the old format , that one might need a conversion as well.

You're current Time Machine backup is fine formatted Mac OS Extended (Journaled).

Besides reformatting it would erase all of the existing backups.

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Answer 4

lanstrad1

Level 3

556 points

Dec 14, 2024 09:07 AM in response to GMSANDISK

Are you able to try another card in order to determine if the problem id with the card, with the reader, with the physical port of the mac, or with the OS ?

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Answer 5

GMSANDISK Author

Level 1

4 points

Dec 15, 2024 03:18 AM in response to den.thed

Used disk utility to convert to APFS and that worked! All files intact. Thanks den.thed.

My seagate time machine drive is on the old format , that one might need a conversion as well.

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New Mac Mini, Sandisk was working fine, now it's not mounting

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