I don't think there's anything special about the drivers a manufacturer provides, that's why Microsoft can provide generic drivers.
Were you copying things to the hard drive from the CD-ROM drive?
Are you running SMARTDRV?
There's a dramatic improvement in cd-rom to hard drive transfers when using smart drive.
(windows setup usually loads it, but when I'm doing a windows install, I always run it first if I intend to copy the .CABS
to the hard drive, it's a dramatic difference)
It should work fine, was your 50X a TrueX?
If not, the only reason it performs nicely under Windows is the buffering/caching that windows provides.
This same buffering/caching is supplied to hard drives too. Try boot clean off a floppy without smart drive
and try to delete a huge file on your hard drive or a thousand small files. It'll be a long wait.
Try it with smart drive, should almost be as fast as it is in windows.