No no no
BIOS
Most 486 BIOSs are limited to ~500MB. Some can do more - depends on the BIOS. Most Pentium BIOSs are limiteg to ~8GB. Try FDISKing your drive - the size it reports is the size the BIOS sees. If your drive is not fully supported, use a drive overlay program (EZ-Drive for WD, Disk Manager for Seagate, MaxBlast for Maxtor...) - can be downloaded from HD mfg. site.
Windows
Windows 95 original only supports FAT16, which limits you to 2GB per partition. IF you have it and a 10GB HD, you'll have to make 5 partition. Win95OSR2 and Win98 can also do FAT32, whose limitation is much higher (higher that any current HD's size), so you partition any way you want.
-PJ