Installing Windows 7 on secondary drive
Solution 1:
it's best to take out the first drive and install windows on the second drive. this will allow your new installation to not see the original one. Also when writing the boot files, you'll have overwritten your original installation's system reserved area. What this will do for you is allow you to pull up your boot menu (from the bios) and select which hard drive you wish to boot from. This, imo, is the preferred way to do such a thing in case you're looking to revert back or format the second drive. This way you have not affected your primary drive at all. Note. some computers have different key strokes for your bios boot menu.
Solution 2:
You can install it on the second drive without disconnecting the first, you just have to be careful to select the proper drive to install W7 on during setup.
Solution 3:
When you boot from the windows 7 disc installation it will see both drives just choose your ssd drive to install it on there. You can only install one Os at a time you can have both going at once cause technically it's one computer if it's a separate computer sure why not.
hope that helps