Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
December 25th, 2016, 11:29
I'm trying to manually rebuild a lost core storage GPT partition table (computer tech accidentally deleted it). I've already determined the starting and ending sectors of the partition, but it seems no matter what I do I can't get MacOS to recognize this stupid thing as a core storage volume.
Does anyone have a sample partition they could upload of a 1Tb MacOS drive that's using core storage? I have a 500Gb one I'm currently trying to modify, but I can't seem to get the checksums right so that a mac will recognize it and not blow up.
I'd really appreciate it if someone could upload the first couple sectors of one of these for me to analyze.
Thanks!
December 25th, 2016, 20:06
Alright, I think I've figured out how to recalculate the checksums now (been meaning to figure that out for a while now).
I should be able to manually add the entry back in now and fix the CRC32 so it'll mount.
December 25th, 2016, 20:44
December 26th, 2016, 10:50
Pretty much. There's actually two checksums, and one is used when the other one is calculated. Then the second one actually uses its own range within the calculation and needs to be zeroed out to run the checksum. Wish I'd seen this article, but I managed to figure it all out. Now I'm just waiting on the correct password to decrypt the core storage volume.
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