siemens sinix floppy notes by Julian H. Stacey:

JHS 1990 memory of Sinix 1985/6
	Tar defaults to use /dev/fl2
	fl0 is label
	fl1 is install script
	fl3 upward I never used

prob from Henny Gloudemanns:
  1st track is not written (formatted).
  skip first 64K in 256 blocks
  rest is 8 sectors/track in 256 blocks