On Thu, 14 Dec 2006, Vaclav Barta wrote: > On Wednesday 13 December 2006 21:29, Alan Stern wrote: > > In fact the stick has 2 LUNs, but your usbmon log shows that Linux is > > looking at only the first one. Probably you don't have > > CONFIG_SCSI_MULTI_LUN set in your kernel. My guess is that the first LUN > Indeed I didn't. I've turned it on and got somewhat different > results. /var/log/messages on stick insert: > Dec 14 18:57:57 quanxi kernel: usb 1-1: USB disconnect, address 2 > Dec 14 18:57:59 quanxi kernel: usb 1-1: new high speed USB device using > ehci_hcd and address 3 > Dec 14 18:58:00 quanxi kernel: usb 1-1: Product: Nu Drive > Dec 14 18:58:00 quanxi kernel: usb 1-1: Manufacturer: > Dec 14 18:58:00 quanxi kernel: usb 1-1: SerialNumber: 075A141402A5 > Dec 14 18:58:00 quanxi kernel: usb 1-1: configuration #1 chosen from 1 choice > Dec 14 18:58:00 quanxi kernel: scsi1 : SCSI emulation for USB Mass Storage > devices > Dec 14 18:58:05 quanxi kernel: Vendor: Model: Nu Drive > Rev: PMAP > Dec 14 18:58:05 quanxi kernel: Type: Direct-Access > ANSI SCSI revision: 00 > Dec 14 18:58:05 quanxi kernel: SCSI device sda: 982016 512-byte hdwr sectors > (503 MB) > Dec 14 18:58:05 quanxi kernel: sda: Write Protect is off > Dec 14 18:58:05 quanxi kernel: SCSI device sda: 982016 512-byte hdwr sectors > (503 MB) > Dec 14 18:58:05 quanxi kernel: sda: Write Protect is off
Obviously this is the LUN you want to use, with almost 500 MB of storage and not write-protected. > Dec 14 18:58:05 quanxi kernel: sd 1:0:0:0: SCSI error: return code = > 0x08000002 > Dec 14 18:58:05 quanxi kernel: sda: Current: sense key=0x3 > Dec 14 18:58:05 quanxi kernel: ASC=0x11 ASCQ=0x0 > Dec 14 18:58:05 quanxi kernel: end_request: I/O error, dev sda, sector 0 > Dec 14 18:58:05 quanxi kernel: unable to read partition table But as you saw, it doesn't work at first. > Dec 14 18:58:05 quanxi kernel: sd 1:0:0:0: Attached scsi removable disk sda > Dec 14 18:58:05 quanxi kernel: Vendor: Model: Nu Drive > Rev: PMAP > Dec 14 18:58:05 quanxi kernel: Type: Direct-Access > ANSI SCSI revision: 00 > Dec 14 18:58:05 quanxi kernel: SCSI device sdb: 3072 512-byte hdwr sectors (2 > MB) > Dec 14 18:58:05 quanxi kernel: sdb: Write Protect is on > Dec 14 18:58:05 quanxi kernel: SCSI device sdb: 3072 512-byte hdwr sectors (2 > MB) > Dec 14 18:58:05 quanxi kernel: sdb: Write Protect is on > Dec 14 18:58:05 quanxi kernel: sdb:<7>usb-storage: queuecommand called > Dec 14 18:58:05 quanxi kernel: sdb1 > Dec 14 18:58:05 quanxi kernel: sd 1:0:0:1: Attached scsi removable disk sdb And the second LUN does work but is too small to be useful. > ``mount -t vfat /dev/sdb1 /mnt/stick'' succeeds (while sda, sda1 and sdb all > fail) but with > mount: block device /dev/sdb1 is write-protected, mounting read-only > > I've read somewhere that it's by design and that ``mount -o > rw,remount /mnt/stick'' should allow write access, but here it fails with > mount: block device /dev/sda1 is write-protected, mounting read-only > - the LUNs are getting confused... Perhaps mount gets the device name from your /etc/fstab file. Do you remember where you read this? > > is meant for some special purpose and the second is what you want to use. > > It should show up as /dev/sdb. > Under Windows, the stick does show as 2 drives (a big, 479 MB, originally > empty one and a small 1,44 MB drive with some PDF documentation and an > executable I still didn't have the occasion to run), but both drives are > normally readable and writeable. Under Linux, ``mount -t > vfat /dev/sdb1 /mnt/stick'' mounts the small storage. Maybe the information you want is in the PDF documentation. It's also possible that the executable (a Windows program, no doubt) will allow you to "unlock" the first LUN, so that all these difficulties would then go away. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
