Hello, I formatted the M3000 with Ubuntu Linux, and... i'm stupid
Take your Sanyo back to Linux box, hook up the USB cable, and then mount it.
Copy the files that you want to keep on to the $HOME directory on Linux.
Next, from a terminal, run
sudo fdisk -l
to display all the mounted filesystems on the computer.
It might be /dev/sdb1, or /dev/sdc1 You should be able to pick out the M3000 as its hard disk size is 6.0 GB. Let's assume that the USB drive is on /dev/sdb1
Re-run the fdisk command.
sudo fdisk /dev/sdb
(press m to get the help menu).
Recommend that you choose d to delete a partition,
then n to create a new partition
when asked about the code for the new partition, use b -- this corresponds to Windows 95 FAT32 file system.
Don't forget w to write the new partition definition out to the USB drive.
Lastly q to quit fdisk.
Once you exit fdisk, remount the M3000 and make sure that you copy your files back on to it.
All Linux and Windows systems should be able to recognize your drive now.