8.0 sysinstall problem with usb stick as source media and usb stick as install target

[Fbsd1]

I know the sysinstall pgm is a dinosaur that nobody wants to touch so I
give Randi great respect in tackling it adding USB support in 8.0.

Using 2 USB sticks. da0 2GB as the bootable install media and da1 4GB
target device that freebsd is to be installed on.

I have put the disc-1 iso onto a usb stick. I can install from this usb
stick (da0)to any motherboard cabled hard drive. But when i try to
target another usb stick (da1) to install to, sysinstall works normally 
  up to the message this is your last chance before writing to the media.
Then i get a abort message "Unable to find device node for /dev/da1s1b 
in /dev!  I then select vty1 and see this message  geom: da1: media size 
does not match label. Followed by repeating messages "debug scanning 
disk da1 root file system" and "debug scanning disk da1 swap file system"

I could be wrong but maybe the disc-1 iso is missing some /dev 
statements for partitions on usb da1 through da9.

Can someone verify this