what's /dev/scsi/host0/bus0/target0/lun0
 

When I mount the usb floppy to directory mnt,system remind me of
the "/dev/scsi/host0/bus0/target0/lun0:<7>usb-storage: queuecommand() called"

I don't know what "/dev/scsi/host0/bus0/target0/lun0" is and what the message means?

its a device file system device (the devfs is a way to organize devices in a more "friendly" way, if you ask me it just makes you type in more then you need to (honestly!, for me at least.... its easier to just remember something like /dev/fd0 /dev/**** rather then /dev/**/**/***/***/*** , it might be more readable, but longer, and in whutxuan's case, completely confusing))

anyways back to the point : you probably don't have the floppy configured right,, i dono why its using the scsi devices tho, does your usb use scsi? or maybe the floppy?

anyways, i think it means ( scsi devices / your computer / the current bus (and probably the only one to) / target device to reach (on the bus) / ****** (i have no clue that the last one is)

but I'm only guessing