The combo of hard disks on firewire in Windows (all versions) is resulting in far too many posts and here (first hand experience) lost data.
The situation is so dire that I'm writing that it doesn't work on PCs.
Try the USB 2.0 connection.
Bob
Dell Inspiron,366Mhz, W 98SE.
I am able to copy pretty large files and folders rapidly to a firewire Smartdisk drive and the data arrive but when I want to retrieve data the system freezes with a somewhat large file eg. a jpg file.It also feezes when Norton Disk Doctor examines the drectory. The Smartdisk drive is working perfectly,having tested it on a Mac G4. The same files that give problems on the Laptop work perfectly OK on the Mac, with no freezing of the OS.
Have I got a dud card or is Windows 98SE not up to snuff.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic