Quote:
Originally Posted by haertig
Gosh, I just got involved in another disk disaster.
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I kind of ran into the same sort of thing recently.
Somebody had an Onyx ereader that they accidentally wrote an update directly to the raw UFS unit starting at sector 0. After much effort we had (almost) everything back but it still wouldn't boot. My utilities that looked at the GPT were entirely happy, what could be wrong? Even with the correct GPT the PBL (ROM primary bootloader) wouldn't start without a valid
protective MBR. Such a MBR is just a bit of boiler plate with the AA 55 and the raw disk dimensions of the maximum possible in MBR (which has nothing to do with the actual disk size). It's the same data for
any GPT, 512 bytes of nonsense. It booted after that.