I have a four drive system. I've been wanting to setup my system like so:
-  HDD 320gb (NTFS) : Windows 7
-  HDD 320gb (EXT4) : Debian on one partition and some other distro on another
-  HDD 1tb (NTFS) : Data Drive ( keeps all data from both os's, such as music, pics, videos, docs, etc)
-  HDD 1tb (NTFS) : Data backup for  drive
So I have done so except for drive , the Linux drive. I wanted to install it, and I started with Mint Linux Debian, just for fun, I was going to partition the drive into two so I could run Debian and then another distro, at this time Mint. SO upon installing it, it asked me where do I want GRUB installed, so I said install it on drive , the drive containing Windows. However, it told me that I don't have enough space on that drive (if i remember correctly). Either way, it failed to install GRUB, and the installation cancelled.
I than proceeded to make a small partition of 100mb on drive  (i know its a lot for GRUB) and I tried installing MINT again, and it did install along with supposadly GRUB, but when I rebooted the computer, Windows 7 came up just like before and there was no noticable changes.
the  drive partition:
- [0']: System Reserved (100mb)
- [0'']: C:\ (297.99mb)
I have an older copy of Acronis Disk Director that I'm sure could get the job done, but I wanted to use something a little less invasive like GRUB. Although I am not sure if this is a good idea or not. Any hints or suggestions are much appreciated