This is the email I sent to & received back from the company re: the same problem I was having with it. You don't need any drivers.

PROBLEM: I have followed directions re: plugging device in, still cannot see device in MY COMPUTER. I have also tried plugging both USB's into computer to no avail. Even tried using it on my laptop, still not showing. My desktop is XP & loaptop is Vista. When I go to remove the dirve, it DOES show as Fujitsu, but I cannot acces the drive or locate it elsewhere. I really want to like this, but will have to return it if this issue is not resolvable.
SOLUTION: You might need to initialize the drive.

Right click on “My Computer” or “Computer” on Vista.
Select “Manage”
On the next screen select “Disk Management”
In the lower middle section you should be able to find your drive.
It will show up as Disk 1 or Disk 2….depending on how many drives you have in your computer.
If you click on the area that says Disk # you should get and option to “initialize drive”.
Also to the right it should show the allocation information for the drive. If it says “unallocated” then the drive needs to be partitioned.
Right click on the white box next to the drive listing.
Select the option “New Partition”
This will bring up the partition wizard and you will need to step through this process.
Select a primary partition.
On the next screen accept the maximum size it will provide.
On the next screen you assign a drive letter.
On the next screen you will do the format and accept the default settings.
The formatting will start and will be busy until it is complete.
You can monitor this from the disk management window.

Regards,

SimpleTech Technical Support