I followed the instructions at
and the mount worked perfectly. I could see my mem card files.
So I got brave and tried to play with it a bit. I unmounted the drive and plugged the usb cable into a different usb port on the rear panel. After a bunch of confusing results I didn't keep track of, I got back to what appeared like the original situation I started with.
But now when I try to mount the drive with:
mount -tvfat /dev/sda1 /mnt/usbdrive I get:
/dev/sda1 is not a valid block device
But the listing for /dev/sda1 looks good to me and "file /dev/sda1" reports:
"sda1: block special (8/1)"
Any Idea how I screwed it up? 8^(