[Coco] OS9 vs RSDOS disks

[Luis Fernández]

BillI sense it so, in my cocodskutil
   SecXTrack = Asc(Mid$(Dsk.Dsk, 4, 1))   SXT = CVC(Mid$(Dsk.Dsk, 18, 2), "I")     If SecXTrack = SXT And SecXTrack > 0 Then Dsk.Formato = 2 'NITROS-9/OS9
OR 
if byte4 = byte19 and byte4 >10 and byte4 <250 then OS9
(byte4 >10 and byte4 <250 ) aprox