I have the same problem with my internal Scorpio Blue WD5000BEVT-80A0RT0. Current Firmware is 01.01A01
The APM value was at 60h and should also be 80h! Please provide a firmware!
It took me several weeks to find out why exactly my ASUS notebook always freezes for a few seconds in different applications. In the Windows 7 Resource Monitor you could trace those hangs, when the last accessed file had a response time of ~3000ms. Then always the HDD spinned up again.
My prior solution was to produce a constant data read with playing a local sound file in loop (however with volume at 0%)
→ Just to be able to work normally!!!
Please fix this little setting in your firmware! Thanks