Does Windows 7 Pro 64 format two new hard drives, if they are both in PC when Installing W7?

WD Internal Drives Desktop & Mobile Drives
1

I have two WD green Caviar hard drives in my PC, but I added the second one after the operating system was installed. W7 obviously formatted the first drive while installing itelf on the first drive. Now since the second drive was added later, do I need to format it to use it?

2

Yes you need to initialize - set partitions and format.