Samsung Portable SSD T7 not working with Catalina

how did you clone the bootcamp to external to work please provide instructions thank you

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Please someone provide step by step instructions how to clone boot camp so I put in on my Samsung t7 ssd external. I read this post a lot of time and can’t figure it out please post step by ste

This guy is trying to help you and you respond w attitude.

Why

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what was your solution?...I have the same issue

Why??? I posted the way to do it via terminal. Why don’t you people read the complete post? Oh Lord...

The drive should work just fine if you properly format it.

Drive Partition and Format - El Capitan or Later

1. Open Disk Utility in the Utilities folder.
2. After Disk Utility loads select the T7 drive (out-dented entry with Samsung.'s ID and size) from the side list. 
3. Click on the Erase button in the Disk Utility toolbar. A panel should drop down.
4. In the drop down panel set the partition scheme to GUID. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
5. Click on the Apply/Erase button and click on the Done button when it is activated.
6. Quit Disk Utility.

Which software did you download? There were multiple options. I downloaded the one that seemed obvious, Portable SSD Software 1.0 for Mac under Samsung T7, and I got PSSD V1.0, that does indeed turn on and off the security on the T7, but nothing that then allows me to us Disk Utility to partition and format as you describe.. just the same options that were available as before, namely exfat and OS extended.

If you haven't solved this already. I let time machine do all the prep and stopped it before the backups began. Then when i went to Disk Utility the partition appeared. So it looks like Time Machine influences the Uid, this then allowed me to partition the Touch drive.

To whom may concern: in these case the fastest way is to zero some sectors (1-2%)of the disk via terminal and the all the options will reappear in Disk Utility.

BE CAREFUL: you might mistakenly erase your internal (or other important disk) if you do not pay the correct attention to the disk which has to be erased after reading the "diskutil list" command result.

So I just got my Samsung T7. It was in FAT32 but ran the program on the disk. Which then had my computer restart. When it restarted, I went to the disk utility in Mac to erase and format . only Mac OS Journal wars available. No APFS. So I wanted to back up with Time Machine. I did that. And now it has one back up and is APFS. And it is in Read only. I cannot add anything to the external drive. I used to be able to have back ups and also some files on same external ssd.

Is this how it is supposed to be? Kinda pain in the butt....I want to be able to drag some files into the T7.

The original poster had this as the last sentence . . . "Also I would like to know which portable SSDs work with Catalina."

Here's what has worked for me, and I have my 2017 iMac booting Catalina off of an external 250GB Samsung SSD, and a second external Samsung 1TB SSD that I use for backups and Macintosh HD clone via Carbon Copy Cloner.

While the Samsung T5 and T7 portable units can cost $149 and $169 respectively, you can pick up an "internal" Samsung SSD of 1TB for under $100 at Amazon or Best Buy. At Amazon, pick up this enclosure https://www.amazon.com/Sabrent-Tool-free-Enclosure-Optimized-EC-UASP/dp/B00OJ3UJ2S/ref=sr_1_3?dchild=1&keywords=ssd+enclosure&qid=1608258968&sr=8-3

and you're done. No additional software to install and the internal Samsung SSDs format easily within Apple's Disk Utility.

Been working for me perfectly! I also have a third Samsung 500GB set up this way to let me experiment with Big Sur without disturbing my working system.

Both Crucial (X8) and other vendors now produce 1GB/s performance external drives in enclosures with USB-C/A connectors. You are not the first to have issues with the Samsung T7 in the Apple Support Communities.