New H/D in BIOS but not in win 98...

Hi all,
I have just installed a slave h/d but although it is showing in the boot-up screen as installed, windows 98 is not recognising it. In Control panel, System, Hardware devices it is shown, but has no drive letter. In Control panel, add Hardware, it is not found. Any ideas.
The H/D is Excelstor Jupiter 60gig. Jumpers are correct. It is saved in CMOS
Tony C
I have just installed a slave h/d but although it is showing in the boot-up screen as installed, windows 98 is not recognising it. In Control panel, System, Hardware devices it is shown, but has no drive letter. In Control panel, add Hardware, it is not found. Any ideas.
The H/D is Excelstor Jupiter 60gig. Jumpers are correct. It is saved in CMOS
Tony C