Let the hive mind of Engadget get that for you.
"I'm pretty much a complete noob when it comes to camera stuff. My wife loves to take pictures, though. So much so that she literally wore out her first point and shoot camera, and the Kodak Z712 I bought for her less than two years ago is starting to act up as well. To compound the matter, we are expecting our first born sometime next year. I fear the Kodak just isn't going to cut it any longer. What would be the best starter DSLR to get? She hates missing photo opportunities due to camera 'lag' so speed would definitely be at the top of the list. Photo quality and features would be next. Price should be no more than $800. I'm not interested in video capabilities."
Wrong. There are several different grades of hard drives available(Enterprise, media grade, OEM, retail). The difference is in the components, quality control and testing done during the manufacturing process, which is usually reflected in the warranty length. Specialized drives cost significantly more than a standard drive of similar size(i.e. media grade drives). Don't believe me? Just check a maunfacturers site.
It is also not uncommon for a large OEM customer to specify certain drive characteristics, if they require it. If a company is buying a device in bulk, they get to pick what they want, but they pay for it as well.
I'm not defending the price and I do not know for sure if the 360 drive is a special grade(I assume it is), but it is possible this is the case.