I just bought and installed Vista Home Premium 64 bit OS on my WD Velociraptor 150GB hard drive and I like it but I suspect that windows 7 will BECOME the OS to have as Vista will eventually become non supported. I'd like to try 7 and START becoming familiar with it but I don't have the room for it on this HD. I'd like to install it on a 465GB partition of my Seagate Barracuda 1TB hard drive. Then I'll need the option at boot to select which OS I want to run at that time.
 So how do I get this file to install on the 2nd hard drive set to "Healthy Primary Partition". The WD Velociraptor drive is set to "Healthy (System, Boot, Page File, Active, Crash Dump, Primary Partition"?
 Will the install give me the option to install the Win 7 OS on the 465GB partition without setting it to "System" therefore removing my present drive as "System"?
 What other obstacles should I expect to run into?
My PC specs are listed below.
EDIT = un-needed information
TIA,
Mike 
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My System Specs:
CASE = Xclio A380 ATX Full Tower
CASE COOLING - 250mm x 2 factory case fans,
   AeroCool XtremeTurbine 120mm - 89 CFM,
CPU = Intel Core2 Quad 8200
CPU COOLING -  Zalman Copper LED 110mm 2 Ball  P#-CNPS9700
MAINBOARD = Gigabyte GA-EP45-UD3R
RAM = Corsair Dominator 8GB DDR2 1066 w/fans    (2) TWIN2X4096-8500C5DF
OS = Vista Home Premium 64 bit
PSU = Corsair TX850W
GRAPHICS = EVGA GeForce GTX 260 (Core 216) P#-896-P3-1265-AR
HARDRIVES = WD VelociRaptor P#-WD1500HLFS
  Seagate Barracuda 1TB P#-ST31000333AS
  WD 320GB 3200AAJ
OPTI DRIVES = all Sony CD-RW
   DVD-RW - DRUV202A
   Blu-Ray 5X BD-ROM & 12X DVD Burner Model BC-5100S 
MONITORS = Dell E228WFP, E173FP
SOUNDS, VIDEO ECT. = WinTV-HVR1600, Creative Sound Blaster X-Fi extreme audio, Gigabyte Realtek Hi-Definition audio
WIRELESS = Linksys WRT54GS router , WUSB54GC adapter, WPSM54G Print server
PRINTER = Lexmark Z1300
PERIPHIALS = Logitech MX 5000 Laser / Bluetooth keyboard & mouse

BACK-UP MACHINE = Dell Dimension 3000, P4 2.8Ghz, 2GB ddr, WD 250GB IDE, PNY GeForce FX 5200The easiest thing to do is disconnect your existing OS hdd and run your Seagate drive as the primary.  Unplug one cable and boot to your W7 cd.

Alan <><  Ok thanks ale52 . When I get both OS's installed, will I have to select which drive to boot from in the start-up screen before it automatically loads windows or will it wait for my command before booting from the drive set as first in the BIOS drive boot sequence? I guess what I'm wanting to do is have the choice without having to make that choice within the given time frame during the start-up sequence, (which is only a few seconds).Well I changed my mind about installing Win7 'release candidate' on this computer. I installed the 32 bit version Win 7 RC build 7100 on my Dell backup PC 2 days ago and it has crashed a few times already when trying to scan my system with my internet security program (which is the same as what I use on this PC). Seeing as how I just built this machine last month at a COST of over $1500 I don't want to be crashing it quite yet.
 I'm not trying to say anything bad about Win 7 RC. So far, after only using it for a couple of days, I am very excited about it. It looks like it's going to be a great OS. The problems I've had so far have likely been due in part to my inexperience, and the RC version I'm using is not a final release. Windows clearly warns that this RC software should not be run on a daily used primary PC:

 
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Things you need to have before you start:
Dedicated test PC: Please don’t test the RC on your primary home or business PC