[t13] SCSI ATA f/w revision bytes how many

Jeff Garzik jgarzik at pobox.com
Mon May 24 14:25:52 PDT 2004


This message is from the T13 list server.


Pat LaVarre wrote:
> Also I've seen proposed a sequence of four:
> 
> 1) a command out command, promising data in or data out next
> 2) a data out command
> 3) a data in command
> 4) a status in command.
> 
> That's how SCSI over USB works.

For some definition of "works" :)


>>The biggest task is attempting to fit all information I need to properly 
>>set up an ATA taskfile into a 16-byte CDB.
> 
> 
> Have to fit in 12 bytes to make much ATAPI happy.  The theory at t13.org
> that an ATAPI device can ask for always 16 bytes of Command Out rather
> than 12 maybe hasn't been widely adopted.
> 
> Have to fit in 12 bytes - or was that 16 - to make SCSI over FireWire
> traces look normal.

The only thing I care about is the 16-byte CDB limit currently in Linux...

	Jeff





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