# File lib/DSK.rb, line 184
        def get_sector(track,requested_sector,sector_order=@sector_order)
                raise "bad sector #{requested_sector}" unless requested_sector.between?(0,0x0F)
                raise "bad sector_order #{sector_order}" if INTERLEAVES[sector_order].nil?
                physical_sector=INTERLEAVES[sector_order][requested_sector]
                start_byte=track*16*256+physical_sector*256
                @file_bytes[start_byte..start_byte+255]
        end