Bad superblock at block 0, fc12 installer fails.
Upgrading fc10 to fc12 with a fresh install. Made several partitions with fdisk. mkfs failed. "Bad superblock at block 1. Need blocks 1 to 4 to create file system. Aborting."
Tried mkfs -c, badblocks, dumpe2fs, no joy. No backup superblocks, because I had already fdisked.
Repartitioned starting at cyl 10. mkfs worked fine then. FC12 installer still could not initialise disk, however. I guess it looks at block 1, to initialise before it offers diskdruid, so it never gets to see my custom partition layout.
How can I force the installer to accept my custom partition layout?
Is a bad superblock at block 1 a fatal, throw-the-disk-away fault?
Thanks in advance