John Maier <jmaier@midamerica.net> asked;

> I have:
> ST-34572W/WC Ultra-SCSI Wide (Barracuda 4XL) - 68pin converted down to 50
> pin.
>    Capacity:4.55 GB
>    Speed:7200 rpm
>    Seek time:9.4 ms
>  ...
> Well in 'dmsg' I get:
> probe(asc0:0:0): max sync rate 5.00MB/s
> probe(asc0:0:0): unrecognized MESSAGE EXTENDED; sending REJECT
> probe(asc0:0:0): max sync rate 20.83MB/s
> sd0 at scsibus0 target 0 lun 0: <COMPAQ, ST34572W, 0892> SCSI2 0/direct
> fixed
> sd0: 4094 MB, 6300 cyl, 8 head, 166 sec, 512 bytes/sect x 8386000 sectors
> probe(asc0:1:0): max sync rate 5.00MB/s
>  ...
> Why does it say 'max sync rate 5.00MB/s' in on one line and 'max sync rate
> 20.83MB/s'?

DEC3000/300 SCSI (PMAZB) is designed to make whining at 5.00MB/sec speed.
By unknown reason the UW Barracuda does not obey to what asc0 driver instructs.

PMAZC TURBOchannel option card can achieve 10.00MB/sec performance though
it's still a narrow SCSI.

Tohru Nishimura/ALKYL Technology