Additional information: Deiban 2.4.27-1-k7, and the entry for the USB device is:
T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 31 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=4102 ProdID=1107 Rev= 0.01 S: Manufacturer=iRiver Limited. S: Product=IFP-700 HIGH SPEED C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Problem: I don't see /dev/sd* created when I plug in my UMS-based MP3 player, and it seems to be a usbdevfs problem.
<snip>
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 192 rq 23 len 4 ret -110
After some fooling around, I realized that although usb-storage loaded sd_mod had not loaded. I issued "modprobe sd_mod", got the /dev/sda device, which points to the proper place on the SCSI chain.
I used the following command to create a FAT filesystem on the MP3 player:
# mkdosfs -v -I /dev/sda
And got this response:
mkdosfs 2.10 (22 Sep 2003) /dev/sda has 9 heads and 56 sectors per track, logical sector size is 512, using 0xf8 media descriptor, with 512000 sectors; file system has 2 16-bit FATs and 8 sectors per cluster. FAT size is 250 sectors, and provides 63933 clusters. Root directory contains 512 slots. Volume ID is 416fdcd5, no volume label.
right size and everything.
I mounted it on the /mnt/ums file:
# mount -v -t vfat /dev/sda /mnt/ums /dev/scsi/host1/bus0/target0/lun0/disc on /mnt/ums type vfat (rw)
No problem. I can read/write to the device and when I umount and unplug the device I can listen to the files.
The problem now is that when I attempt to plug the device in again, and attempt to mount the system using the same command, I get an error:
# mount -v -t vfat /dev/sda /mnt/ums
mount: wrong fs type, bad option, bad superblock on /dev/sda,
or too many mounted file systems
According to syslog:
Oct 15 09:35:22 bagpipes kernel: SCSI disk error : host 1 channel 0 id 0 lun 0 return code = 70000
Oct 15 09:35:22 bagpipes kernel: I/O error: dev 08:00, sector 0
Oct 15 09:35:22 bagpipes kernel: FAT: unable to read boot sector
But Linux mkdosfs will never, ever create a boot sector, and why didn't it complain the first time?
Other symptoms:
* If I "rmmod sd_mod ; modprobe sd_mod" I can remount the system (!)
* If I *don't* unplug the device, I can umount/mount the system without problems:
Oct 15 09:41:41 bagpipes kernel: Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
Oct 15 09:41:41 bagpipes kernel: SCSI device sda: 512001 512-byte hdwr sectors (262 MB)
Oct 15 09:41:41 bagpipes kernel: sda: Write Protect is off
Oct 15 09:41:41 bagpipes kernel: /dev/scsi/host1/bus0/target0/lun0:
So, here's the less clueless question: Is this a symptom of hotplug problems, a known sd_mod problem, or something else? I find it hard to believe that sd_mod has to be rm/modprobe'd each time as a matter of course.
-- Moshe Yudkowsky * [EMAIL PROTECTED] * www.pobox.com/~moshe "The Constitution is ... quite succient -- 21 pages giving complete operating instructions for a nation of 250 million people. The manual for a Toyota Camry, which only seats five, is four times as long." -- P. J. O'Rourke
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