This is something other than a traditional HD issue
Traditionally we have had issues with the 13” 2011-12 MBP with failed hard drive/IR cables and failed drives. But this seems to be something else.
Yesterday I had two machine come back in.
MBP i5 2.3 GHz 13” Early 2011
MBP i5 2.5 13” Mid 2012
MBP i7 2.9 13” Mid 2012 (mine)
All the above machines came in with problems reading the drives.
All got new hard drive 2012 cables and Seagate 1 TB SSHD FireCudas for a second time!
The first two were repaired within the last month and a half and had already had the cables and drives replaced.
The third drive is one I have for stock. On it, it runs perfectly with Mavricks but nothing above that.
Something else is happening with these machines and I strongly suspect Apple of doing things in their updates to disable 3rd party repaired machines.
I have also seen this on 2011=12 iMacs (both the 21” & 27” machines with replaced FireCuda drives and OWC thermal sensors.
We have been giving the standard answer of hard drive cable replacement but I firmly believe this is something Apple is doing.
@danj @arbaman @oldturkey03 Do others have any opinions on this problem or solutions?
UPDATE
I would like to see if a Mojave Beta will fix this issue but I’m not signed up as a developer any more.
SIDE NOTE on Thermal sensors
I have ordered in the 2N3904 Transistors and 2N4401 NPN Transistor 40 V 600 mA 4401 TO-92 to see if these cheap things will work instead of using those $45 per pop OWC sensors.
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Don't forget the newer 2.5" FireCuda drive is now a fixed SATA III (6.0 Gb/s) drive so don't use it in the older SATA II (3.0 Gb/s) systems. The 3.5" FireCuda drive is an auto sense drive so it works across the different SATA I/O speeds!
из Dan
I'd be inclined to think about some kind of dislike between Firecuda drives and latest Mac Os versions. Unfortunately I don't have around any of that kind of drives to test, however I have always around 3/4 boards of i5 2,3Ghz and i5 2,5Ghz, all fixed at component level and tested and I didn't record any problem with Ssd or standard drives and updated with Sierra/High Sierra.
Funny enough, the bad Hd cable plague on this side of the ocean seems not to exist almost at all. Anything you might want me to try, just ask, with pleasure.
из arbaman