After upgrading to MacOS Sierra on a Mid-2012 Retina MacBook Pro with an aftermarket OWC SSD, the “folder with question mark” icon appears upon boot, and intermittent pinwheels cause hard-resets/crashes — especially coming back from sleep mode. System heats up during charging.
Things Tried That Did Not Work
- PRAM Reset
- SMC Reset
- First Aid with Disk Utility
- Flashed the OWC SSD to latest firmware
- Disabled FileVault
- Clean install of Sierra
- Opened up the laptop and reseated the OWC SSD
- Disabled the “put hard disks to sleep when possible” check box in the Power section of System Preferences
- Changed “hibernatemode” value from 3 to 0.
- Disabled Wake for WiFi, Power Nap and Automatic Graphics Switching
- Removed the OWC drive, cleaned the contacts with alcohol and placed a small pad to apply pressure to the contacts to ensure good contact.
- Secure-erased the SSD
What Finally Did Work
The adapter and drive together are a bit taller than the original equipment. There appears to be a slight clearance issue. The drive fits right up against the bottom panel and pushes it out slightly, about~0.2mm, after reassembly. It’s not enough to notice unless you’re looking for it, but the adapter could be improved with a slimmer profile. For half the cost of a more perfect fit, it’s a satisfactory option.
So much for the fabled longevity of SSD‘s — the OWC lasted about three years.