On Sun, 4 May 2014, Andrew Berg wrote:
ada0 being the disk I want to recover. My question is, knowing the exact commands given to create the GPT, how should I go about creating a file that will restore the GPT on ada0 without damaging the data on the partitions themselves? I suppose I could create a new GPT on the scratch disk and use the output of 'gpart backup' from that, but I'm not sure it would be 100% correct and I'd have to clone the original disk over it again, which would take hours since it's a TB and dd isn't exactly the fastest way of copying data (even with large blocksizes). I'm very hesitant to write *anything* to the original disk.
It will take a while to copy the disk with dd(1), but that's really the only safe way. Make a copy, and write the partition tables to that.
gpart(8) only writes to the partition tables or bootcode, and should be safe for the data in the partitions, but the only way to guarantee that is on a copy, not the original.
gpart backup produces plain text that can be manually created. I'd still rather let gpart deal with the disk directly by using gpart create and add commands.
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