Tick on Samsung Electronics close the details window and restart your Mac as prompted. Unlock the settings and click on details. Click on go to Security & Privacy settings and under The General tab you will see the text I described earlier. Then reinstall the Samsung Portable SSD utility and you will get the notification saying the extension has been blocked. Follow the guidelines in the medium article to disable the feature mentioned above. Unistall the Samsung Portable SSD utility using the script inside the Application contents. If you miss that at the first installation it will never appear again unless you switch macOs in recovery mode and disable kernel extensions blocking. The first time you are to install the software it prompts you to go to System Preferences > Security & Privacy and under the General tab you are to find a Notification under the "Allow apps downloaded from:" section. This is not a Samsung issue, its a Big Sur issue. Note that there was no reinstalling of the OS, no changing permissions or disabling SEP in Recovery Mode ( crsutil, spctl, etc.) I tried those solutions, but I ended up resetting all those back to defaults before running the above steps since they didn't help.I had the same issue. Reboot - afterwards the SSD should be recognized again and all should be well!.Approve the security prompt in System Preferences before allowing the Samsung software installer to reboot your computer - otherwise you will have to repeat this process.Their website also advertises a special version of the software specifically for Big Sur users, but I did not find this was necessary to use. Install the "normal" Portable SSD software from the Samsung website.sudo rm -rf /Library//StagedExtensions/Library/Extensions/SamsungPortableSSDDriver.kext.sudo rm -rf /Library/Application\ Support/PSSD_Installation.sudo rm -rf /private/var/db/KernelExtensionManagement/AuxKC/CurrentAuxKCA/StashedExtensions/17A3D6DA-575D-40F2-B1EC-59FD1CB31623 (I checked what was in each of the StashedExtensions subfolders and found the one that had Samsung Portable SSD stuff).cd /Users//Library/Application\ Support/Portable_SSD/.YMMV and you might not have to run all these steps.
Here is the sequence of steps I finally came up with that fully removes all traces of the PSSD software and got me back to a working state. In turn, the reinstalled software doesn't work / doesn't have the correct permissions to access the SSD. Therefore, when you try to reinstall the software, macOS doesn't prompt you to approve the security exception for the software in System Preferences -> Security & Privacy. The root issue appears to be that none of the suggested solutions actually does a full removal of the Samsung Portable SSD software.
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