Sorry Maxiumus, but the "USB Mass Storage Controller" driver was not integrated for 98SE. IT WAS AVAILABLE IN WINDOWS ME, but I've never seen anyone make a package to update 98SE with the ME files.
So you need a specific driver. What's worse, every device needs its own specific driver. You could have two identical thumb drives from two different companies, using the same internal parts, use the same driver, but any slight variation between devices will require a slight variation in the driver. WHAT A HEADACHE!
Sorry.