Tor Arne Vestbø wrote:
The reason I did this was because /dev/sda and /dev/sdb used to be part of a RAID1 array, but were now used as system disk and home disk respectively. I was afraid that mdadm would pick up on some of the lingering RAID superblocks on those disks when reporting, so I shredded them both using 'shred -n 1' and reinstalled.
This is irrelevant to 1.x superblocks, and largely insignificant for 0.9 superblocks (baring some really bizzare cases). In either case mdadm --zero-superblock /dev/XX (possibly executed multiple times) would save you a lot of disk churning :)
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