Booting from the old hard disk from power on to login screen was 72 seconds. The new one takes 42 seconds. I ascribe that mostly to the improved disk speed (7200 rpm vs. 5400 rpm).
WAY snappier. Astonishingly so. I suspect that much of the caching that is happening is the file allocation and bit map parts of the file system. Even a small cache would do that, of course, but lots of other stuff can sit in cache alongside those items when you have 4 GB of cache.
While the increase in RPMs gains you around 33% more data per second, the real improvement is due to the increase in data density on the platter(s). Even with no RPM change, going from 100GB to 500GB allows the read head to access 2 to 3 times as much data with each revolution of the platter.
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