I´ve just fineshed to format my pc, which is running smootly on XP SP2, and tried to connect my passport essential 320gb but the OS is not recognizing it. Tried connecting a pen drive and others USB devices and worked fine.
Strangely, the drive works fine on my laptop, where I installed at first when I got it.
Please read my post here. It is long and infomative and surely help to remedy your problem. And SP3 has nothing to do with USB drives. USB2 drives works since SP1.
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