I agree with Brian's comment that this is being overstated by a lot of people. I scan 35mm film at 4000 ppi. Each of those images is about 120MB, quite a bit larger than even the largest file produced by shooting the D800 in RAW, 14 bit. On the other hand if one has very limited computer processing power that can only process small files (say, one has been shooting jpegs in lowest quality that produce files that are less than 1 MB) then the size of the D800 files will probably be a problem for that computer. Of course it is easy to test this before buying a D800. Just create files that are at least as big as those created by the D800 (in whatever quality setting you will be using with the camera) and work with them. You will then know in advance whether any upgrading of your computer is necessary.

JDT