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Re: bytes per sector

  How rare are drives that do not have a 512 byte sector size?
  Which operating systems do support odd sector sizes?

Apollo Domain/OS used (I think) 1064 byte sectors.  The extra bytes were
used to record the inode number, block offset, and other info telling
exactly where that sector came from.  This made it possible to reconstruct a
file system that had suffered extensive damage.

This turned out to be pretty useless.  Disks either get a few bad blocks, or
they fail completely.  Or if they do get many bad blocks, it's always the
file system data, and not the metadata, that you lose.

Modern wintel floppy drives are capable of formatting a floppy with many
different possible sector sizes, but in practice only 512 is used.

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