On Mon, 19 Jul 2004, David Laight wrote:

>> These are results of two different commands.  One is the ATA/ATAPI IDENTIFY
>> PACKET DEVICE, and the other is the SCSI INQUIRY.  ATAPI devices typically
>> support both.  (I forget whether that's required.)
>
> Look at the format of the response buffer - I think you'll find that
> they are basically the same.

I'm still confused about how the SCSI interface is invoked for ATAPI 
devices, but I can see they're not the same. ATA has a 40-byte "model 
number" and 20-byte "serial number". SCSI only gets 8-bytes of "vendor 
id" and 16-bytes of "product id". For most CD drives, "model number" 
equals "vendor id" plus "product id", and "serial number" is blank, 
while at least a few put what I would call the model number in the 
serial number field, and leave the "model number" blank. (I was 
operating under the mistaken assumption, earlier, that the driver
was presenting the same data differently, rather than the firmware.)

I think the Antec drive must be the first one ever that fails to 
return a vendor id. "Antec" is not listed in the registered vendor 
id's at www.t10.org. The usual thing would have been to stake a claim 
first, and register later. Who knows what they were thinking?


Frederick