thanks for replies
It´s obviously the noise of HDD... 2secs loads some data then pauses and then again and again. It is also visible in the task manager that disk loads - under svchost.exe and system processes. I guessed it could be a malware or virus but the laptop is certainly clean of that.
Windows 8 queues background repairs to a system process that runs as a idle process. (does data integrity and filesystem repairs of your hard drive)
System process identifier = 4 (most likely not a virus)