On Mon, 10 Feb 2014 13:48:51 +0100, R.Wieser wrote:
Hello All,

I've noticed a number of times that the HD-activity led of my XPsp3 computer
flashes continuously in an about 4 HZ rhythm, and today I decided to ask:
What is accessing my HD that way ? Is it really needed ? This way the HD
will never go into its suspended/sleep mode.

Try logging the disk access using Process Monitor before going into
suspend/sleep mode. Use advanced output mode if you want all the details
(mostly kernel-mode accesses).