Re: [linux-usb-devel] Re: /dev/sr0 not ready, but working

[Jeff Garzik <jgarzik@pobox.com>]

On Tue, Nov 22, 2005 at 01:56:39PM -0500, Alan Stern wrote:
> I know practically nothing about how your device works, so this is just a
> guess.  It seems likely that the IEEE1394-USB/ATA interface controller
> translates the commands it receives over the external bus into a sequence
> of ATA or ATAPI commands that is somewhat different from the sequence of
> commands Linux would use if the drive were directly attached to an IDE
> controller.  As a result, perhaps the drive sends those "not ready"  
> replies when you use it over an external bus but not when you use attach
> it over ATA.
> 
> Or maybe not...  Maybe the drive _does_ send those "not ready" messages 
> and the IDE driver ignores them instead of printing them in the system 
> log.  Or perhaps those messages are sent by the bus interface controller 
> and not by the drive itself.  I just don't know.

The difference is between ide-cd.c and sr.c, most likely.

	Jeff