You know, you could just *PARTITION* one large hard drive and install all your OSes that way. Your computer will generate a lot less noise and heat, and use less electricity too.
And I suspect getting one 750 GB hard drive would cost less than buying three smaller drives.
My current notebook has 4 (count 'em, four) OSes installed onto one 250GB hard drive. Here's the order I used to install everything.
1. Install DOS. In my case, I use the DOS that came with Win98. Use a boot floppy or a bootable thumbdrive with FDISK, Format, Label, Sys, and so on. I made one partition with 250 MB of space. That's plenty for Norton Ghost 2003 and the few DOS things I still have to/like to do.
2. Install WinXP. Tell the installer to make a second partition and install to it. XP will install a boot menu that lets you go to DOS. 30 GB.
3 Install Vista. Tell the installer to make a third partition and install to it. Vista will install a new Boot Menu that has an option for an older version of Windows. Choosing it displays the boot menu that XP put on. 40GB.
4. Install Linux. I used ubuntu, which creates two partitions (EXT3 and a SWAP partition). It puts on another boot menu called grub. Choosing Windows from it launches Vista's boot menu. 10 and 1 GB total.
5. Format the rest of the empty space as NTFS. Store all your data there, including your My Documents folder, your mail store, your photos, your music, and VMWare images, and your Ghost images. All the OSes (except for DOS) can read and write to the data partition, allowing full access to your stuff no matter what OS you're booting into. About 160GB, give or take.
6. If cascading boot menus bother you, install another boot manager to rule them all. I used to use Boot Magic, but I don't know what I'd recommend now. Otherwise, set the default OSes and timer times so that your favorite OS boots automatically by going through all the menus.
7. Optional. Use software that exists across all platforms. I use Firefox and Opera for email, and there are Linux and Windows versions. Tell each to use the same folders on the Data drive for storing bookmarks, email stores, and so on.
Works every time...
-Llama