Chances are, the drive just isn't being mounted. if you have a folder /mnt/hda you can mount it manually with the "mount" command, or, to make it easier you can add it to your /etc/fstab file. For example, here's the line for my win partition in my /etc/fstab file. This mounts the fat32 partition at /dev/hda1 to /mnt/fat-c
/dev/hda1 /mnt/fat-c vfat defaults 0 0
with this in my fstab i can just run "moutn /mnt/fat-c" to mount it in that place, if you want it mounted at boot time, I believe it will be if you change the last 0 to a 1.