Sandisk 1TB ssd not getting detected.

This solution has been working for me as well. Although, I have to do it every single time I use the drive. Have you figured out how to get this fix to last? at least for a few uses? It's frustrating to have to "repair" the issue every time I want to use an external drive. (This happens with all my Seagate drives on my M1 Macbook Pro)

For me it was the cable. I have a Sandisk extreme 2TB SSD external that worked just fine on my macbook in the past (I used it for backups). It suddenly stopped working - want to bet it was connected to compatibility issues thru an update?... Anyways, I tried a ton of stuff: plugged into a pc to diagnose, used the apple brand dongle thru usb and usb-c, checked the usb-c ports, ran repairs, etc. It all came down to just using an apple brand usb-c to usb-c cable and it was back to normal.

This works for me but the issue is, it happens too often, when I reconnect the ssd, or restart the mac mini, always it fails to get detected and I have to connect it to a windows pc and fix it... any permanent solution for this ?

try this. it worked for me. go into Disc Utilities and see if the SanDisk is there. if it is, click on it wait a bit and it will appear on your desktop. unfortunately, u have to do this every time, but it's worth it for folks like me who cannot find a PC easily.

The same issue for me! MacBook Pro M1 2020 and the solution was plug the SSD using the original cable and a USB A -USB C adapter. Then I used the utility disk, erased the volume and worked!!!

Just consider that before all this great solution, I formatted my Mac and reinstalled macOS :(. Maybe that helped

[Por si lo requieres en español]

Tuve el mismo problema en una MacBook Pro M1 2020 y la solución fue conectar el SSD usando el cable original y un adaptador USB A - USB C. Luego usé la app Utilidad de Discos, borré el volumen y funcionó!!!

Solo considera que antes de toda esta gran solución, tuve que formatear mi Mac y reinstalar macOS :(. Tal vez eso ayudó

I'm having this issue with my MacBook Pro M3. My 500gb Sandisk works until I eject it and turn the computer off. The next time I turn on the laptop, my computer won't detect the drive, not even in disk utility. The drive works perfectly on a Windows computer, no errors.

The only way to make the drive work again on my M3 MacBook is to plug it into my older MacBook Pro with an Intel i5. My old MacBook won't mount the drive anymore after ejecting it from my M3 MacBook. Somehow, my M3 MacBook is damaging the drive. However, unlike my M3 MacBook, my old MacBook is able to detect the drive in the Disk Utility. So I run First Aid on the drive, and it works again. It also works on my M3 MacBook, but then it gets damaged again if I eject it and turn of my laptop. It's just annoying repeatedly repairing this disk on my old MacBook.

This has happened on 2 Sandisk Extreme Drives for me. My only work around was to get a usb-c to usb-a adapter and plug-in to a hub / not directly to the computer.

Moved to a new thread: External disk in Sonoma not recognized - Apple Community