>   sd0: 64000 KB, 62 cyl, 64 head, 32 sec, 512 bytes/sect x 128000 sectors
>
> >From the messages above, it seems that the kernel correctly identifies the
> camera as a usb mass-storage device.  However, when I try to mount the
> device, I get the following messages:
>
>   root:~# mount /dev/sd0d /mnt
>   mount_ffs: /dev/sd0d on /mnt: Input/output error
>
> So I have several questions:
>   * Is 'ffs' the correct filesystem type?
no. msdos is correct
>   * Is /dev/sd0d the correct device?

maybe. but maybe this drive has partitions.
run disklabel to check

>   * Why am I getting an i/o error?
>
> I have had no problems mounting this on linux, using the 'vfat' filesystem
> type.  Thoughts and ideas would be appreciated.  Thanks.
>
so why you use ffs here?
mount_msdos