I think basically a laptop hard drive is a laptop hard drive...at least as far as them fitting in the same spot etc...there are all 2.5" drives.
The main thing to look for is the spindle speed.
I see in that example it is 4200...which is the slower speed now I think..they also make 5400 and now 7200 for laptops.
Faster spindle speed makes apps start faster etc...but it also produces more heat and uses more battery..so there is that tradeoff.
If you just want more space then just keep the same spindle speed.
You dont have to buy a Dell hard drive or go thru Dell....for those kind of prices they are crazy.
Pay no mind to the ATA rating.
I think you will like these prices better
http://www.newegg.com/app/listProduc...tby=11&order=0
All you have to do is buy norton ghost and ghost the old drive over to the new drive.....which is a little tricky with a laptop cuz there is no other hookup for the second drive.....what I do in that case is take the hard drive out of the laptop...put a 3.5 to 2.5 IDE adapter on it and take it to a regular desktop machine and then do the ghosting there.
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I would be VERY careful trying to use the disk copying software that comes with any of the hard drives....we see all kinds of horror stories and frustration when pople use that junk, lol....norton ghost can be found cheaply..usually you can buy norton system works for around $15 which comes with ghost.
for example
http://216.185.135.132/shopping/shopexd.asp?id=481
JP