i downgraded back to my stock 250gb hard drive

few months ago i mentioned after upgrading my hdd to a WD scorpio blue 500gb, i noticed bad hdd performance and it got worse over time. at 1st i thought i got a faulty unit, so after sending it back to the shop they gave me a new one. turns out the problem rose again. i went ahead and did a clean install of SL, and again after a few weeks, suffered the poor hdd performance. here's what im talking about
these are screenshots from activity monitor when i'm cloning my system (the 500gb) to the stock 250gb drive using superduper


u can see the 'valleys' which indicates there a no hdd activity. during this time my system would freeze but still can switch apps n the dock still magnifies. it gets serious that it looked like this

screenshot of superduper during cloning
copying 7gb took 25mins. the whole cloning took a whopping 12 hours! for a ~180gb system

. for comparison, i cloned my system before when it was just ~130gb and it only took 4-5 hours
i have 4gb RAM and they were never full according to activity monitor. also, transfer rate from an external hdd to another external hdd was normal. that's why i suspect the internal hdd prob. so anyone have a clue?
as i said this is the 2nd unit i got. could it be that i got two faulty hdd? damn unlucky ;p
This post has been edited by dvlzplayground: Feb 7 2010, 10:29 PM