I agree... my previous Windows XP laptop used to have this problem when applications used to run slowly all of a sudden. The hard disk was the problem. I managed to keep using it for a few more months by reinstalling the OS (replacing with Linux), but replacing the HDD made things OK again.
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I agree... my previous Windows XP laptop used to have this problem when applications used to run slowly all of a sudden. The hard disk was the problem. I managed to keep using it for a few more months by reinstalling the OS (replacing with Linux), but replacing the HDD made things OK again.
It may not rank among some of the heavyweights mentioned here, but I liked "Computer Networks" by Andrew Tanenbaum.