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Old 12-19-2012, 05:04 PM   #1
Registered: Jul 2011
Location: Canada
Distribution: Debian, Arch
Posts: 55

Rep: Reputation: 0
Erased my Partition Table and Restored it

I was a little careless today and I erased my MBR and GPT off my hard-drive. I was trying to set up a new boot usb disk.

mklabel msdos
Warning: ....
I ignored the warning and continued wiping out my hard drive GPT. I was certain I had typed parted /dev/sdb and not /dev/sda but I was in a rush and I assume I had typed it correct.

Luckily, I made my partition table system fairly simple with blocks of 50 GiBs. I was able to use parted to re-write my partition table. The table was from memory, although I had to re-write it twice as I had the last partitions backwards. parted was able to detect the FS and I used that as a rough guide to ensure I had my boundaries correct.

It was a bit of a pain to rewrite fstab and my syslinux.cfg file using new UUIDs.

I forgot to re-write the mbrgpt.bin to the MBR, so I used my Arch Linux install media as a rescue disk.

Interesting caveat. The Syslinux chainloader chain.c32 uses lsblk -o PARTLABEL,PARTUUID and fstab uses lsblk -o PARTLABEL,UUID

Two Lessons Learned:
1. Don't Ignore Warnings (Even if you're in a rush)
2. Doing things manually helps you when your up **** creek.

Last edited by snmcdonald; 12-19-2012 at 05:05 PM. Reason: details


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