I have an iMac Retina 2017 (and a Mini, 2014) running Mojave and Sierra respectively. I had a spare Samsung 850 EVO (250 GB) SSD from another computer that is dying. I got a new USB3 case from Amazon (Orico). Fitted the SSD and plugged it in. Weirdness begins.
1. Wouldn't show up in Finder, Disk Utility, Terminal (diskutil).
2. Unplugged and replugged. Showed up once allowed me to reformat it.
3. Ejected and wouldn't show up again.
4. Tested on both machines. Same problem.
5. Placed the SSD in an old USB2 case. Mounted and worked without an issue.
6. Placed an old 160GB HDD in the USB3 case. Mounted and worked without an issue.
7. Tested the USB3/SSD combo again: wouldn't mount.
8. Changed the USB3 cable with a cable from a Seagate 2TB, 2.5" drive mounted. Allowed me to install Mojave. And then halfway through installing apps, it hung. Hard reboot of iMac.
9. Tried plugging into the Mini. Mouse cursor disappeared!
My conclusions:
the case works, the drive works, the cable works. They just don't work together.
I would be very grateful for any help or pointers.
I've already returned one case because it went through these issues.
Thank you
Ashok
Asked by asarath
(11 rep)
Aug 22, 2020, 11:53 AM