Normally Win98 cannot recognise partitions with NTFS filesystem.I assume its a brand new harddisk which is normally unpartioned and NOT formatted.If u want the new HDD to show in win98 format it using FAT32 filesystem by running WINXP setup again.else use third party software like paragon partition magic.IF u don't want to format it U can mount it in win98 by using third party software from Paragon(Sorry,i don't know the name of the software)