Most of the newer laptops, including this one, have SD Card slots (think camera card), that you should be able to boot from.
Flash memory, like SD Cards, has come down in price so far, that I just picked up (3) 8gb cards for $70 on craigslist. Brand new Sandisk Extreme III class 6 cards.
8 gb is more than enough to load XP and mapping software. In theory, you shouldn't need to use your hard drive for anything other than storage of music, files, etc. Or you can set up a dual-boot, where you would load from the hard drive, while at the dock only.
They also have 16gb cards out there, if not larger. I would recommend ghosting that setup, to your regular hard drive, in the event that your SD Card failed. That way, you'd just put in a blank card and re-image it.
You could also buy an SSD (solid state drive), and replace your regular hard drive with is, leaving your SD slot open.
Imagine a 12" touchscreen GPS that doesn't use a hard drive at all...
J
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1987 32 Sedan Bridge
Twin 360s, Rebuilt 2006
Modified/Original Electronic Ignition
Raw Water Cooled
Catawba Island, Ohio