
There's no hard and fast rule here that says you absolutely must install Windows on this drive, in fact it will boot merrily from any hard disk in your PC and from any partition on that drive. Windows often places a 100Mb System partition at the beginning of Disk 0 though. This hidden partition stores the boot information for your PC. It's completely separate from your Windows installation but absolutely critical.


These disks are labelled by Windows, Disc 0, Disc 1, Disc 2 and so on with Disc 0 (zero) being the critical one to the operating system. This is the disc on which you really should install your copy of Windows. This wasn't a problem even a few short years ago as computers only came with a single hard drive. With the cost of hard drive storage still tumbling though and capacities increasing, it's becoming more and more common to find two hard disks inside a new PC and even some high-end laptops.

This address does exist within Windows but it's well hidden. One time when you will see it though is when you install the operating system and with Windows 7 (and Vista) it is vitally important to make certain you choose the right one.
