In other news, yah, you can do this.
The SD card is mounted as if it is a disk so you install a bootable copy of Yosemite 10.10.2 on it. This will not work for porting from System A to System B, however. My first whizbang idea was to install 10.10.2 and then boot it on the iMac. However, that doesn't work as you need to generate OS X on the model of machine which will use it.
The above may still be possible if OS X 10.10.2 can be downloaded somehow to the iMac and then installed on an SD card in the builtin SD card reader. A 2012 Macbook Pro has one as well and that's how I know this works. The SD card is, in effect, a not very bright but exceptionally fast SSD.
The value in the exercise is successfully running OS X 10.10.2 on the iMac means unquestionably there is a bug in Yosemite 10.10.3 as we've seen it fails even when no other software is installed on the machine. Successfully running OS X 10.10.2 proves there is no esoteric weirdness about this particular machine which is crashing OS X 10.10.3. After all the testing, that probability is vanishingly small but that test would lock it to zero.
The SD card is mounted as if it is a disk so you install a bootable copy of Yosemite 10.10.2 on it. This will not work for porting from System A to System B, however. My first whizbang idea was to install 10.10.2 and then boot it on the iMac. However, that doesn't work as you need to generate OS X on the model of machine which will use it.
The above may still be possible if OS X 10.10.2 can be downloaded somehow to the iMac and then installed on an SD card in the builtin SD card reader. A 2012 Macbook Pro has one as well and that's how I know this works. The SD card is, in effect, a not very bright but exceptionally fast SSD.
The value in the exercise is successfully running OS X 10.10.2 on the iMac means unquestionably there is a bug in Yosemite 10.10.3 as we've seen it fails even when no other software is installed on the machine. Successfully running OS X 10.10.2 proves there is no esoteric weirdness about this particular machine which is crashing OS X 10.10.3. After all the testing, that probability is vanishingly small but that test would lock it to zero.
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