I read about the faster drives in laptops, and I am sure they help. I am only recording 2 tracks at a time now and have had no problems using my work laptop. I don't think it is at 7200 either. It was pretty high end when I got it 2 years ago, but now the specs are pretty average. It is a:
IBM t20
750 Piii
256 RAM
12 gig harddrive (not sure of speed)
CD/RW
Win2000
I have been able to monitor about 25-40 tracks with no problems with Sonar -- depending on the number of plug-ins.
The screen is large and overall is a solid performer with few crashes and drop outs. Also, use the USB port with an Evolution 249c as both a soft synth keyboard and control surface (very cool).
It has 2 PCMCIA slots, no firewire (though you can use an adapter w/ th PCMCIA). I will probably upgrade to a better soundcard when I turn this puter in in august and get a new one. Probably will be at least a P4 1.5G HP -- company issued.
For sound quality you can check out some random works in progress I have up at
http://www.home.earthlink.net/~adamcrose/index.html
This is with the stock soundcard, Shure 58, ART MP, occasional alesis quadraverb, some plug-ins, soft syths, lots of quitars, old tube amps, pedals, etc.