Constant casing hdd LED blinking

So the LED for hdd on my case is blinking constantly non stop. checked resource monitor and found that system is writing between 100 000 to 1 000 000 B/sec, and happens on the OS HDD. Is this normal or what?

Intel core i7 2600K
ASUS P8P67 WS Revo
Gskill 8gb 2133MHZ
2x GTX 580 EVGA BOps
LG Bluray
2x WD Caviar Black 1TB
1x WD Caviar Green 500G
1200W Antec HCP
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More about constant casing blinking
  1. Yeah, it's pretty normal. I turned off the indexing service to cut down on some of the write load on the OS drive, but there are still lots of other tasks puttering away in the background.
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