Re: MicroVAX 3100-40 -> asc0: !TC on DATA XFER

Darren,

A couple of qucick observations,

1) If it's out of a B180 then it definitely does the 512byte sector size 
(not all SCSI cd drives do). That's good.

2) You may have some addressing problems with the 146gb cheetah's. Note 
the NUMBYTES col from SARGE after it's crapped out doing the CHS 
calculation. This is probably unrelated to this issue though.

3) I have a xm5401. They're a quad-speed that found it's way into sgi's 
O2's and a fair few sun boxes. They have trouble reading some home-burnt 
CD's, especially if burnt at >16x. Perhaps it's just my drive but it 
really is not reliable if using homeburnt 700mb discs.

I sadly found out the hard way with mine that burning at >16x setting on 
my drive causes this thing to rarely pick it up. It may be timing out 
attempting to read the disk and the 53c94 under obsd has the timeout 
set too short (again, would like to dump the registers to get the 
state). VMS typically has pretty long device IO timeouts so it can 
cope with sillyness like my RL02's so it's often more tolerant.

A good test, would be to find a "new" shop pressed CDROM disc, that is no 
larger than 640mb. Boot OpenBSD and try to dd the raw device and redirect 
it's output to /dev/null so your not hitting disks repeatedly on this CD.
See if it has timeouts, and keep an eye on it's behaviour when it is 
having them (ie is it spinning up/down/etc). Shake-stir-repeat with the 
install CD that has troubles.

Al.


-- 
  --
  Al Boyanich
  adb -w -P "world> " -k /dev/meta/galaxy/ksyms /dev/god/brain