Christian Biere said:

>> roothog# mount_msdos -o rdonly /dev/sd3e /mnt
>> mount_msdos: /dev/sd3e on /mnt: Operation not supported by device

Note that this is NetBSD 1.6ZC

The camera is a Vivitar Vivicam 3705. According to Vivitar, it needs
no special drivers and mounts without added software under Windows XP,
Windows 2000, and Mac OS X

>Could you try a ktruss to see what operation exactly fails?

roothog# ktruss mount -t msdos -r /dev/sd3e /mnt
  3370 ktruss   "/libexec/ld.elf_so"               JUSTRETURN
  3370 ktruss   emul(netbsd)
  3370 mount    mmap(0, 0x8000, 0x3, 0x1002, 0xffffffff, 0, 0, 0) = 1208311808
mount_msdos:   3370 mount    open("/etc/ld.so.conf", 0, 0x3)    = 3
/dev/sd3e on /mnt  3370 mount    __fstat13(0x3, 0xbfbff8b0)         = 0
:   3370 mount    mmap(0, 0x46, 0x3, 0x2, 0x3, 0, 0, 0) = 1208344576
Operation not supported by device

-- 
Rick Kelly  rmk@rmkhome.com  www.rmkhome.com