Xbox One's 500GB HDD swapped for bigger, faster drives, and tested for performance

The Xbox One arrives with a 500GB HDD built-in, and in contrast to the PlayStation 4's easily-accessed storage, it's not meant to be accessed or replaced by the user, ever. While we'll probably leave ours in place to keep from voiding the warranty or risk a ban from Xbox Live, a few folks have already cracked open the console to see what else will fit. iFixit noted during its teardown that there's an off-the-shelf 2.5-inch Samsung HDD inside connected via SATA II inside, and swapping that out is...