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I'm having issues formatting a Samsung T7 SSD on my iMac

I'm trying to format a new T7 as APFS, got to where it is now formatted as OS Extended Journaled, then again went through the erase and select steps, chose APFS, but it got to the last step, mounting, and failed.

What do I need to do, to prevent it from failing?



[Re-Titled by Moderator]

iMac 27″ 5K, macOS 11.7

Posted on Jan 15, 2024 1:17 PM

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3 replies

Jan 21, 2024 11:27 AM in response to Saxman

This forum is not the same as a chat. You will not necessarily get immediate replies ... especially if your post appear rude ... like the second one.


Folks here volunteer their time to try helping when they can. It could be that no one, seeing your initial post, had an answer for you. You should already know this as a Level 2.


... and going back to your first post. It could be possible that there is an issue with this particular drive. Disk Utility was successful in creating both an APFS Container (what was called a Partition in HFS+), and an APFS Volume inside of that container. What it couldn't do is mount the drive.


I suggest that you first run Disk Utility's First Aid to see if it finds any issues with this drive. Better still, and a good tool to keep in your troubleshooting "toolbox" is an app, called DriveDX, which IMHO, does a more through job of evaluating a drive's health.

Jan 22, 2024 9:40 PM in response to Tesserax

Sorry about my frustration, but I did install one, but it soon froze up and wouldn't mount. Sent it back, got a new one, and still having issues. I'll call Samsung, and see if they can help, this is ridiculous, as if it's asking so much that it just mount. I did run First Aid, and it checked out OK, which I thought a bit ironic, as it's OK, but Disk Utility can't get it mounted? Thanks for your comments, maybe I'll try DriveDx, and see how that goes...

I'm having issues formatting a Samsung T7 SSD on my iMac

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