In order to commuincate with your windows partitons, you need to mount them. Every device is attached to (or pointed to by) a device file located in /dev floder. E.g. floppy is /dev/fd0, cdrom is /dev/cdrom, hard drives are /dev/hda1, hda2,.. this name-style may be explained as follows. Let's take hda1:
hd: hard disk.
hda: hd primary master on IDE0
hdb: secondary master on IDE0
hdc, hdd: primary, and secondary salve on IDE1
hda1-4: primary patitons of hda. You can have up to 3 primary (bootable)
partitons, and only one extended partiton. those are named hda1 through hda4.
And hda5 through any number are logical partitons inside the extended partiton.