On Thu, 17 Jun 2004, Mick wrote: > Hi, hope you guys don't mind me jumping straight in and aksing a > question. > > I believe I am the leader in the evolution of USB device usage, I > recently purchsed a USB 2.0 CDROM case, and placed in it a working > DVD-DOM drive. I say i'm the leader only to make light of my lack of > discovery of previous trouble/success reports on this particular usb > combination. > > My final goal is to purchase a DVDRW to put in the case, but I though it > would be prudent to test it with a DVDROM first.. See the case details > here: > > http://www.snt.com.tw/product.php?mode=show&cid=22&pid=63 > > Using USB, the DVD-ROM reads CD's and single layer DVD's fine. But it > worn't read dual-layer (DVD-9??) disks. Well, it will, just not very > well.. > > dmesg shows lines like this (alot) after trying to read: > I/O error: dev 0b:00, sector 9372632 > I/O error: dev 0b:00, sector 9372640 > I/O error: dev 0b:00, sector 9372640 > I/O error: dev 0b:00, sector 9372648 > I/O error: dev 0b:00, sector 9372648 > I/O error: dev 0b:00, sector 9372656 > I/O error: dev 0b:00, sector 9372656 > > What could be wrong? The DVD laser works, as when I plug this into a > windows (i know, i know, but it works..) PC, i can play the DVD..
What might be wrong is that the communication between the enclosure and the drive is highly sensitive to some timing details (which we don't understand), and that Linux tries to drive the device a little too fast. Of course that's just a guess, based on similar experiences other people have had -- you really didn't provide much information to go on besides "this isn't working... why not?". Would you care to post the contents of /proc/bus/usb/devices with your drive plugged in? You can also try turning on the usb-storage debugging option in your kernel's configuration and posting the system log. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
