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[Brian J. McGovern]

 > 
 > 
 > Hi,
 > 
 > I inserted an USB stick into a 5.1 FreeBSD box and
 > was pleasantly surprised to see it being autodetected:
 > 
 > umass0: UrDisk USB FLASH DISK, rev 1.10/1.00, addr 2
 > da0 at umass-sim0 bus 0 target 0 lun 0
 > da0: <UrDisk USB FLASH DISK 1.00> Removable Direct Access SCSI-2 device 
 > da0: 1.000MB/s transfers
 > da0: 15MB (32000 512 byte sectors: 64H 32S/T 15C)

... and I've been sending patches as I get my hands on more brands/types.
Unfortunately, this isn't one of mine, so I can't claim credit ;)

 > But when I try to mount it, I'm getting 
 > 
 > # mount -t msdos /dev/da0 /mnt
 > msdosfs: /dev/da0: Invalid argument
 > 

See if there is a slice for the device, e.g. /dev/da0s1. Also, you can try
a fdisk on the device, in case it doesn't use the first slice (I've yet
to see this on USB devices, but ZIP drives used to use slice 4 for their
"DOS" partition).

If you still can't get it to work, drop me a line, and I can try to provide
some other pointers. On most devices, its a matter of tweaking the protocol
settings in umass.c.

 > 
 > Assumed I will get it working soon, how can I achieve that
 > it is automatically mounted?
 > Is there a user wrapper to mount/unmount the USB stick?


You should be able to set something up in /etc/usbd.conf for attach. Detach
may be a bit tricker, as you should unmount the filesystem before pulling the
stick.
	-Brian