Microsoft did the same with the Xbox360 HDD's (atleast at the birth of the console, I know later in the consoles life MS removed the restriction on using USB Hard drives with the console). The hard drive contained a "security sector" which contained the MS Logo in PNG format (made with Macromedia Fireworks MX 2004 on the 19th of July 2005).
I'm not sure if anyone at MS ever confirmed it but we presumed MS had put it there so that if anyone was found selling unofficial hard drives then you could of been found to be breaking copyright laws because you needed to include the Microsoft logo in the hard drives you were selling for them to work on the 360.
I'm not sure if anyone at MS ever confirmed it but we presumed MS had put it there so that if anyone was found selling unofficial hard drives then you could of been found to be breaking copyright laws because you needed to include the Microsoft logo in the hard drives you were selling for them to work on the 360.