Thomas Schmitt wrote:
Hi, Bill Davidsen:Dumb question, why do you not look at the nice list of CD devices provided ... /proc/sys/dev/cdrom/info
I'm going to cautiously say that this file, intended for humans but can be parsed, seems to handle anything up to a mix of IDE, "real" SCSI, and USB, and tells you what the kernel thinks of them. That may be more important than the truth, if a device says it can support feature X, but the kernel doesn't agree, I would not expect that feature to work reliably.
Actually i was using the nice list of CD device files which is provided according to the SCSI Howto but has been deprecated by Documentation/devices.txt whereas Documentation/scsi/scsi.txt still refers to the SCSI Howto. /proc is an interesting thing. But where is it documented ? On what feature in /proc can i rely ? /proc/scsi/sg/devices once gave me hints about the activities of my drives. Not any more. :( I will begin to collect /proc addresses about CD drives. Maybe one can develop a kindof expert system from that list.
This has been around forever, I see it on an old box running RH8 (2.4.18) as well as a modern dual-core running a recent -rc kernel. Thought it might be useful to tell you what the kernel would let you see and use.
-- Bill Davidsen <davidsen@tmr.com> "Woe unto the statesman who makes war without a reason that will stillbe valid when the war is over..." Otto von Bismark