Samsung Portable SSD T7 not working with Catalina

Did you set Partition scheme to GUID in the Erase dialog?? APFS should then be visible as an option when the device (not a volume under it) is selected.

Then use Mac OS Extended, Journaled. Are you sure your T7 is an SSD? What will you use the T7 for? Your image did not get uploaded.

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(⌘⬆︎3) Command-Shift-3 Capture the screen to a file

(⌘⬆︎⌃3) Command-Shift-Control-3 Capture the screen to the Clipboard

(⌘⬆︎4) Command-Shift-4 Capture a selection to a file

(⌘⬆︎⌃4) Command-Shift-Control-4 Capture a selection to the Clipboard

(⌘⬆︎5) Command-Shift-5 Invoke new screen grabber

Strange you can't see it on the desktop (are the Finder prefs enabled in order to view hard disks?). After that the only way is to zero down some sectors via Terminal (1-2%) and Diks Utility will be able to format it in any way you desire. As I said above.

Secondly, any SSD MUST work with Catalina. There are no standards for Apple or for Windows in terms of hardware. At least in filesystems.

So you don't have this partition scheme option in the Erase dialog when the device is selected? Then the APFS option should be available.

Exactly what was the solution so you may help others with the same problem?

In reading the above posts, I was about to mention that the need to "Show All Devices" until I saw your post. :)

Norbert E. Fuchs wrote:

Thank you all for your help. After some input from Samsung Support it worked out OK. My problem is solved.

It is customary in public forums that when a solution is found the solution is posted in order to help others.

This is interesting and helpful information. I've always recommended not using third party disk management utilities and to use Disk Utility to manage a drive. I'll have to dig further into this.

Thanks for getting back with that info.

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Samsung Portable SSD T7 not working with Catalina

I tried to connect a 1TB Samsung Portable SSD T7 to my MacBook Pro running under macOS Catalina, but failed to do so.

Starting DiskUtility, I noticed that the SSD is formatted as FAT32, that the disk cannot be partitioned, and that erasing/reformatting the disk as APFS is not available.

I also downloaded the T7 software from Samsung, but to no avail. The software simply claimed wrongly that the disk was not attached.

I wonder what I can do in this situation.

Also I would like to know which portable SSDs work with Catalina.

Hi...Thanks for response...why not APFS ? ( versus MACOS Journaled )....My issue: I'm using Big Sur, Carbon Copy, Imac pro (2015 ) and Samsung T7. External drives not always showing up ( either from system preferences or holding down Option key on startup ).

I can get it to work usually by turning off MAC completely ( vs "restart" ) but the inconsistency make me uncomfortable and I don't have another MAC to validate the bootable clone with )

What I'm trying to achieve is cloning my MAC internal drive to the Samsung T7 , then restarting the Imac from the T7 to validate the clone actually works.

Thanks for any insights

Hi. Working with the same problem but can't get anywhere since after installing the Samsung Portable SSD v.1.00 (from the SSD) my mac won't start (Catalina / MBP 2019). Have tried SHIFT and OPTION restart, but even the latter ends up stucked when the progress bar coming to an end. What next?