Right now it's 80Gb 5400rpm sata150 what could be the best upgrade ???
320 Gb+ 7200rpm sata 300 (but used at 150 ???) but what about power usage (even used without the battery all the time) ???
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The WD Scorpio Blue seems to be a popular choice now. Not only is it super quiet, but it's a great deal for 500GB, and an excellent performer. Of course an SSD would be ideal, but keeping price in mind, I'd say a scorpio blue is the best choice right now.
Keep in mind, the X-25M is a solid state drive: