Here you go Bhai .. I Googled and found the below for you
EDIT: Sorry just realized you wanted to know of a good hard drive not how to replace it. I'll still leave the below though.
DELL INSPIRON 510m/ 600m/ LATITUDE D600 FAQ
Link:
Click Here3.(iii) Can I upgrade the Hard Drive? What can I upgrade it too?Yes, absolutely you can. These three models can be upgraded with any standard 2.5" notebook Hard drive. It can take the greatest capacity (100GB) and greatest speed (7200rpm) Hard drives currently available for laptops with no problems, anything that is in that 2.5" format pretty much.
But how to do it? Well it is very simple. But first, keep in mind to transfer the pin adapter from the old hard drive to the new one or it will not connect properly, below is a picture of what is meant by the pin adapter, it fits right onto the pins at the end of the HD.
I personally recommend the Hitachi 7k60 hard drive as the best laptop drive on the market at the moment. It has a decent 60GB capacity and is powered along with a 7200rpm rotational speed and 8MB cache making it super quick. To top this off, it runs cooler than most 4200rpm and 5400rpm laptop HDs and is also quiet, using about the same amount of power as those slower drives so you are not sacrificing battery life. Have a look at the Pricegrabber results for it here, with a listing of vendors and current prices you can find the best deal.
Now the instructions:You can see the front panel of the Hard drive right beside the PC card slot on the side of the system, if you unscrew the single screw holding it in on the bottom you can pull it out like so
All that needs to be done is to disconnect all power (including the battery), unscrew the screw holding the bay in place, pull it out, undo the four screws in the sides holding the HD in the caddy, and take off the pin adapter. Then reverse those steps to install the new one. Following are the appropriate instructions so get going!:
http://support.dell.com/support/edocs/s ... tm#1123687The 510m is slightly different with there being two screws holding the HDD caddy in place rather than one,
http://support.dell.com/support/edocs/s ... =dhs&cs=19