limitations on mount_cd9660?

[Jonathan Horne]

ive been trying to mount up my iso files so i can have access to their 
contents as quickly as possible.  ive used mdconfig to create block devices 
for 4 .iso files, but when i get to the point where i try to mount the 3rd 
one, i get:

mount_cd9660: /dev/md2: Invalid argument

i created my block devices like this:

mdconfig -a -t vnode -f /path/filename -u 0
(-u 1, -u 2, -u 3, etc etc)

all 4 devices created without any complaint, and they show up when 
i 'ls -la /dev/md*'.  are we not able to mount more than 2 .iso files to 
folders at a time, or am i missing something here?

thanks,
jonathan