USB mass storage woes

[Dylan Smith <dylan@iompost.co.im>]

I'm trying to mount a 64MB 'keyring' USB flash drive. It refuses to work. 
Relevant parts of dmesg:

umass0 at uhub0 port 1 configuration 1 interface 0
umass0: LEXR PLUG DRIVE LEXR PLUG DRIVE, rev 1.10/0.01, addr 2
umass0: using SCSI over BBB-P
scsibus2 at umass0: 2 targets
sd0 at scsibus2 targ 1 lun 0: <LEXAR, JUMPDRIVE, 1.01> SCSI1 0/direct 
removable
sd0: 4198MB, 984 cyl, 4 head, 32 sec, 34820 bytes/sec, 125952 sec total

I'm using OpenBSD GENERIC#44 i386

In frustration, I even did this:

for i in /dev/sd*
do
mount -t msdos $i /mnt
done

(The unit appears to be an MSDOS filesystem in Windows and Linux, Linux 
reporting it as vfat)
The results I get:

mount_msdos: /dev/sd0a on /mnt: Device not configured

after a lengthy (a minute or so) pause where the system is rather 
unresponsive, except for /dev/sd0c which gives the long pause, but then tells 
me it's not an msdos file system.

Anyone had any success with these devices?