Hmm...Yeah, it might not have it..
But I think i have figured out the problem...
That drive must be formatted in the FAT32 file system to be seen in WIN98.
It seems to me it has been formatted in the NTFS file system, which will not be recognised as this is a new way of storing data.
If though you switched to WinXp, or anything newer, NTFS would be recognised and you'd see your drive, as your mate probably is using, or something reletivley new.
The only way of fixing this, would be to go to your mates house (get data off, if any since it seems you wouldn't of been able to copy anything onto it) and then reformat it in FAT32 which should be an option when doing so.
Use a bootdisc to access dos which you can create in Add/remove programs in win98 under Startup disc or something. Then reset the computer, making sure in bios that the floppy drive is set to run before the hard drive (first boot device, 2nd boot device etc.) and when it has ran, type this:
cd:\ (to get to the C drive (or main hard drive)
X:\ (this should then display underneath, x being the drive letter)
type format x:
and type y. You should be able to choose the type of file system around here.
If its Slave, all it would do is make it act as a slave. It would just be undermined by anything in Master, thugh this isn't the problem as i've now figured
I hope this clears things up