parkverbot is a daemon that prevents hard disk head parking in rotational media. Modern rotational hard disks have a misfeature involving the regular automatic unloading of the heads, measurable by the SMART attribute "Load_Cycle_Count". This causes latency on wake-up amongst other issues (and it cannot always be turned off). The parkverbot daemon will periodically issue small read requests in order to keep the hardware from going to its head-unloaded idle state.
