Obvious1 wrote:
I have had this since the spring of 2010. My problem was that I was or am getting the pin-wheel. I have felt that I was bumping up to the max on he 500g hard drive.
Yes, if you're very low on disk space and RAM, you may experience serious slow-downs because it gets increasingly difficult for the system to allocate new swap space.
I have found some reasonable pricing for RAM and a larger hard drive. I am concerned with the hard drive fitting and will these upgrades void the warranty on the Mac.
RAM is really inexpensive these days. I have 8GB RAM in my MBP (same model as yours) and I couldn't do with less with my needs. In fact, I just upgraded my brand new iMac to 16GB in order to be able to run linux and windows in virtual machines and still keep enough memory left for OS X.
It's quite easy to upgrade these machines, just be careful when you open the cover that you keep track of where the different-length screws fit (follow the manual and note that most of the small screws should be screwed in at an angle).
Regarding fitting an HD: I think you need to make sure that the HD has 9.5mm height. This will limit you to 750GB max (still, I think), and even with 750GB drives you should watch out that you don't get an older higher model. I just ordered WD Scorpio Blue WD7500BPVT for my son's 4 year old MacBook (1st generation black Core 2), which I'm sure will fit fine. Some months ago I upgraded my daughter's 4 year old white MacBook with a similar 640GB models. These work very fine even with these old machines (in fact, they are less hot than the original disks).