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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