I installed XP Pro on Acer Aspire1 AOD250, + all drivers from Acer website and now the HDD spins down after 5-10 seconds of inactivity and then spins back up after few seconds since XP keeps accesing the drive in the background all the time. Then again spin down in like 5-10 seconds of idle and the process repeats. I dual-boot with Ubuntu, under which there is no problem with the disk. I used free HD Tune 2.55 but it shows me no info except the temperature, and while on hd tune's website I found Drive power manager. Tried it, and I can prevent the disk to go to stanby - spindown. All is great until system restart and the problem is back. So it seems that windows keeps changing the HDD power management on boot-up and I have to use the Drive power manager every time as workaround. Is there any other way to manage HDD power management in XP. Registry keys maybe? The drive is WD3200BEKT.