The following will work, if you have already partitioned your HD.
In the MDK8 install procedure, choose Expert mode.
The defaults will do, until you get to the partition/format screen.
There, select which HD, and which partition you want linux on, click to highlight the partition, REMOVE it, then hit the Auto button. The installer will repartition
within the partition you selected, to a root, home, and swap partitions, leaving the
remainder of the drive untouched.
This means you can install Linux anywhere, on any partition, on any drive, without losing any Windows info, EXCEPT...any windows partitions
after the Linux one(s), will jump UP one drive letter.
eg. If you install linux to the second partition of the secondary master hd, (formerly drive E: ) hdc1, that partition will become invisible to Windows, and if you HAD an F: and G: they will become E: and F:
The following will happen if you HAVE NOT already partitioned a drive.
Choose Expert mode, defaults until you get to the partitioning section.
Choose the HD you want to install Linux on, REMOVE any partition, and hit the Auto button. This will COMPLETELY remove any FAT or FAT32 info on that drive!
Resize as you see fit.
You must now select the REMAINDER of the drive to partition, and you can select what filesystem you want to use, linux, fat, fat32...(the joys of linux, read/write to (almost) any type of filesystem!)
Random advice: Partition the drive BEFORE running the install, and set aside your 5 gig for linux (no need to format it). Partition magic is your friend.
Ideally, your second drive is empty, partitioned into 2, 3, or 4 partitions, and you install linux to the first partition, leaving the rest as fat32 (you can change later, if you want a second partition for Linux).