John Wilson wrote:
  Hard or soft head number?  I feel sure I ran into a
format (Commodore?) where
 the sector headers had the opposite head numbers to the side on which they
 were actually recorded. 
Sellam Ismail <foo(a)siconic.com> wrote:
  I know that's true on the Apple ][.  Side
"1" is actually the backside of
 the diskette and vice versa. 
I have no idea what you mean by that.  The Apple ][ disk format has no
concept of "side".  There's no field in the address mark for a side
designation.