I've got one of these drives, and a 15EARS 1.5TB drive. The problems here are definitely spin-up delay, set a delay of about 3 to 4 seconds, I had this with older drives years ago. I use mine as archive drives, and WD say they're Advanced Format drives so they need to be calibrated, I had big problems cloning one to the other under XP, as XP required the calibration, but Win 7 managed fine. Once I cloned it under Win 7, I could use it under XP, but transfer rates seem slower.
Look on the label, it has a warning, and mentions the Paragon software you need to use. So you don't need to rip your drive out, I've copied it here:
Advanced Format Drive. To achieve full performance:
*Windows XP, multi partition and cloning software users - use WD Align software available on www.wd.com/advformat.
*Windows XP, single partition - Set jumpers 7-8 prior to installation or use WD Align software.
*All other OS configurations - Drive is ready for use as is
They take a while spinning up, it's to prevent damage to the motor driver (smooth) chip. If it spins up too fast, the chip gets high resistance, causing it to get hot, decreasing its lifespan. A motor needs high current to get to optimum RPM under the load of the platters and air resistance between the arms & heads, then it tails off.