SSD Unreadable after battery died.
Ok, here’s a weird one:
Last week I was using my 2011 15” MBP as normal with no issues on battery power. I was checking email when a family emergency presented itself, so I left the MBP on the kitchen counter.
Needless to say, when I returned, the MBP had gone into deep sleep as the battery had died. I plugged in my power adapter and waited until the battery was fully charged. Upon restart, I noticed that the computer was EXTREMELY sluggish, to the point of non-usability, so I restarted the MBP. After the chime, I got a dim grey screen with no Apple logo. NVRAM resets and SMC resets did not improve the situation.
I removed the Samsung SSD and replaced it with the old hard drive I had removed years ago, and the MBP booted as normal, ruling out other possible hardware issues. I installed the suspect Samsung SSD into another test 13” 2012 MBP, and it exhibited the same issue, although after about 5 minutes I got the blinking folder with question mark symbol.
I have also tried placing the SSD in an external USB enclosure, but in this configuration, the SSD is invisible to Finder, Disk Utility and Terminal.
Is this SSD toasted?
The OS on the suspect Samsung SSD is High Sierra, and the OS on the working 13” MBP is Mojave.
Also, I got no prompts from any of the folowing OS's stating that the drive could not be read and needed to be initialized or formatted when connected as an external drive in a USB enclosure: Mac OS El Capitan, macOS Mojave, mac OS Sierra, Window 8, Windows 10 (yes, I tried it on 5 different machines). Not even a nudge to indicate that the computer recognized a device hooked up to USB.