On Nov 14, 2017, at 1:58 PM, Carl Hoefs <[email protected]> wrote: > > The Seagate HDD I replaced was not the original one that came with the iMac, > but was the one it had been running fine with for the last few years. So the > new HDD of the same type should be a plug-in replacement without issues.
Beginning with the 2010 iMac, Apple started pulling drive temperature data from the SATA pins of the OEM drives. After market drives usually didn't provide the same pin-out information, even when they were the same make/model. The usual indication of this was the fans racing, but even when that didn't happen the drives wouldn't pass Hardware Test. It's not unreasonable to suspect if you have an after-market HD in a Mid 2011 iMac without an Inline Thermal Adapter, the High Sierra update might choke. I know for a fact it runs fine on that same vintage machine with stock drives, after market SSD drives w/thermal sensor in 3.5" SATA slot, and after market SSD drives in backside SATA slot (which doesn't expect to get temp data). $35 might be money well spent to keep this machine happy. -david _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
