Hi,
Following  entries are there for  /dev/sdc and /dev/sdb

crw-r--r--    1 root     root       5,   1 May  9 15:48 console
crw-r--r--    1 root     root      29,   0 May 11 13:48 fb0
crw-r--r--    1 root     root      89,   0 May 11 13:51 i2c-0
crw-r--r--    1 root     root      89,   1 May 11 13:51 i2c-1
crw-r--r--    1 root     root       1,   1 May 11 13:49 mem
crw-r--r--    1 root     root      90,   0 May 11 13:52 mtd0
crw-r--r--    1 root     root       1,   3 May 11 13:49 null
brw-r--r--    1 root     root       8,   0 Aug 14 12:06 sda
brw-r--r--    1 root     root       8,   1 Aug 14 12:06 sda1
brw-r--r--    1 root     root       8,   2 Aug 14 12:07 sda2
brw-r--r--    1 root     root       8,  16 Aug 14 12:07 sdb
brw-r--r--    1 root     root       8,  17 Aug 17 15:17 sdb1
brw-r--r--    1 root     root       8,  18 Aug 17 15:17 sdb2
brw-r--r--    1 root     root       8,  32 Aug 14 12:07 sdc
brw-r--r--    1 root     root       8,  33 Aug 17 15:17 sdc1
brw-r--r--    1 root     root       8,  34 Aug 17 15:17 sdc2
brw-r--r--    1 root     root       8,  35 Aug 17 15:19 sdc3
brw-r--r--    1 root     root       8,  36 Aug 17 15:19 sdc4


Again running mount with dev = sdc1, sdc4, sdb, sdb1 ["mount -t vfat <dev>
new/" ] give "Mounting failed No such device"

As told I also ran "mkdosfs /dev/sdb"

Few cases were failure where I hanged on write (0x2a). One case was
successful. 
Following SCSI cmds were sent [ 0x0, 0x0, 0x28 [READ(10)], 0x28, 0x28, 0x28,
0x2a, 0x2a, 0x2a ] in success case.
I checked on catc that status of cmd was success with residual =0.

However still mounting with /dev/sbd or /dev/sdb1 give error "No such
device".

Pls tell me if you want more information.


Thanks
Regards
Manish

-----Original Message-----
From: Alan Stern [mailto:[EMAIL PROTECTED] 
Sent: Monday, August 14, 2006 8:06 PM
To: Manish RATHI
Cc: linux-usb-devel@lists.sourceforge.net
Subject: Re: [linux-usb-devel] Usb storage mount problem


On Mon, 14 Aug 2006, Manish RATHI wrote:

> Hi,
> I am using my usb controller driver in host mode for mass torage 
> emulation. Mass torage device is detected and I got following prints

> SCSI device sdb: 1024 512-byte hdwr sectors (1 MB)
> 
> 
> sdb: Write Protect is off
> 
> sdb: assuming drive cache: write through
> 
> sdb:<7>usb-storage: queuecommand called
> 
> unknown partition table
...
> SCSI device sdc: 1024 512-byte hdwr sectors (1 MB)
> 
> 
> sdc: Write Protect is on
> 
> sdc: assuming drive cache: write through
> 
>  sdc:<7>usb-storage: queuecommand called
> 
> 
> 
>  sdc1 sdc4

> I mounted usbfs and able to see mass storage in /proc/bus/usb/devices
> 
> However when I try to mount by
> Mount -t vfat /dev/sda /mnt/pendrive then
> I get error "Mounting /dev/sda on /mems failed: No such device" I 
> tried it on sdb and sdc as well but it's not mounted.
> 
> Can any one tell me abt possible problem?

You have two USB mass storage devices: /dev/sdb and /dev/sdc.  So of course
trying to mount /dev/sda doesn't work.

If mounting /dev/sdb doesn't work, it could be that the device isn't 
formatted.  You might have to run

        mkdosfs /dev/sdb

You shouldn't try to mount /dev/sdc; instead you should try to mount either
/dev/sdc1 or /dev/sdc4.  But first you will have to create entries for sdc1
and sdc4 in /dev, because they don't exist already:

        mknod b 8 33 /dev/sdc1
        mknod b 8 36 /dev/sdc4

BTW, this would be much easier if you used udev.

Alan Stern



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