I would think your HDD would be quite heavily shielded which would protect it from magnetic interference however if you are at all nervous, don't do it.
From a recording stand point Id experiment with the best places to put things to minimize noise. You should be able to make some lovely recordings with a MacBookPro. Best of luck !!
My instructors page and www.studiotrax.net for all things recording.
my toons Brought to you by Dr BadGAS
my toons Brought to you by Dr BadGAS