I want to install the OS onto a new HDD (no OS disc was supplied)

Right, I bought an HP Pavilion p6565uk from morgan computers for a reasonable price. They listed it as 'new', but on the box it came in it looked like it was an HP Gold renew.
Anyway, no Windows 7 disc came with it. I wasn't particularly surprised, as the laptop (Acer laptop from a 3rd party online retailer) my mother bought ages ago didn't come with a Vista disc, so I guessed this was par-for-the-course.

The 1TB internal HDD does have a 11.7GB HP Recovery partition (with 1.43GB free), visibly containing a tiny 'Recovery File Folder', and I'm fairly sure I've seen recovery options in the BIOS.

(the background stuff, reading it isn't crucial)
I am planning on buying a 2TB 7200RPM SATA WD Caviar Black (once I have the money after all these years of cheap IDE drives, the prices of SATA drives came as a shock to me ) and I guess the best way for me to utilise it would be to use that as a secondary HDD for 'data' (being media, such as iTunes library, Revision3/TWiT podcasts, TV shows etc.), as the Movie and TV folders on my PC at the moment are 206GB (on a 1TB HDD. I currently 'only' have 45GB free space, and the 206GB space taken up would be a lot larger if I actually put my main library of media (for example, 50 or so 720p Diggnation episodes) on the internal HDD.
(end of background stuff)

Anyway, usual background information done...

What if I decide I want to install Windows 7 (Home Premium) onto the 2TB drive instead for the benefit of complaining programs that demand C: (from my experience) such as iTunes and Steam. There is a typical Microsoft/OEM CoA sticker on the side of the computer, but that's about all there is. So, what would I do? Would I somehow be able to install Windows 7 onto the future 2TB drive, or will I be stuck with the OS staying on the 1TB drive?

(also, apologies for the poor thread title, I couldn't really think of how to describe the predicament)

theog said:

   Information

We always assume you have made your Recovery Disks using the OEM manufacturer's Recovery Media Creator app the first day you had your new PC.
& made the Startup Repair CD.
startup repair disc-create

Did you make the OEM manufacturer's Recovery Disks?

Pressing the f11 key during startup on a computer with an HP factory image will start the system recovery process even if the prompt is not displayed.
Recover Windows 7 Operating System Using HP Recovery - HP Customer Care (United States - English)
Performing an HP System Recovery in Windows 7 - HP Customer Care (United States - English)

How to make HP Recovery DVD disks:
Recover Windows Vista Operating System Using HP Recovery - HP Customer Care (United States - English)

How to make HP Recovery USB disk:
Creating a Recovery Disk on a USB Flash Disk HP Pavilion dv6700z CTO Entertainment Notebook PC - HP Customer Care (United States - English)

or
You can Order HP Recovery Disks from here:
Compaq Mini CQ10-500 PC series*-* HP Notebook PCs - Order Recovery Discs for Windows 7, Vista, or XP - c00810334 - HP Business Support Center

wow, thank you VERY much!
I have a stack of blank DVDs lying around, so I'll get burning as soon as possible
I get confused with the new layout of the HP website, so it would've taken me ages to find that myself
(as the HP article in one of your links said, type 'recovery' et voila, there was the (slightly more modern) cyberlink recovery disc creator )
(I'll go for disc rather than USB, as I only have one working high capacity memory stick left )

quick question, are the £35 or so recovery discs that one can order from HP exactly the same as I'm burning now, just for people who didn't make them before their PC died?

theog said:

I would say,YES.
Most OEM manufacturer's will send them at out free in the first 12 months.(may postage fee)

ok, thanks for all the help/tips