Good day everyone.
I have a Macbook Pro 9,2 that can't read an SSD that has a macOS High Sierra installed on it.
For the background context, a friend gave me her Macbook Pro for me to retrieve the files, and told me I can keep the laptop after. What I did was I took out the current hard disk, inserted it on an enclosure, and gave it to her.
Now, I have two "spare" SanDisk SSDs:
- 240 GB -- macOS Sierra
- 480 GB -- macOS High Sierra
At first, I inserted the 480GB SSD, but it wasn't booting. I was given the blinking folder icon which indicates that the laptop wasn't able to read the hard drive. I then rebooted the SMC and PRAM, and on the normal boot, I held the right option/alt key to see the bootable devices, but I didn't see any, which established that the laptop couldn't read the 480GB SSD as a bootable device.
I then inserted the 240GB SSD, and I was able to boot normally. I then inserted the 480GB into an enclosure, and then attached it to the laptop. The laptop was able to read the contents in the Finder, as well as list down the item in Disk Utility. However, the top level was read as
AppleAPFSMedia, and then the
SSDName under it. This gives the impression that the laptop cannot properly read the 480GB SSD as a bootable Hard Drive.
Now, we how will the MacBook Pro read the 480GB SSD APFS as a bootable hard drive?
Right now, we're thinking of upgrading the 240GB SSD from macOS Sierra to High Sierra. We think that doing so would upgrade the BIOS, and enable the laptop to read APFS format hard drives. However, we're very reluctant to do this, because if it doesn't work, we will need to wipe a hard drive and try to install High Sierra again.
Has anyone experienced this situation before? Any lead would be very much appreciated.