sco scsi - bad magic number

i am installing sco unix v4.2 on a 80486 system board -amddx4-100mhz with adaptec 2940 (also tried mylex,asus,tekram cards too)... boot with N1 disk... when i link btl or default scsi driver.. it gives an error " bad magic number " and cannot continue the install. able to low level format the scsi disk.
any ideas?
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plebrasConnect With a Mentor Commented:
2 options : The N1 disk is out of order. Have you tried with a another one ?.
or : with Scsi controler the first disk with SCO must have a SCSI ID = 0 (no jumpers for the address)
Just installed SCO Unix V3.0 on P60 MHz with adaptec 2940 today!  Try this,
1) On Boot up   -->  CTRL <A>  --> Adaptec SCSI Utils
2) Set Host SCSI ID = 0    (Not 7, as  manuals/default settings say!)
3) Link with Adaptec alad Driver
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