DX58SO, I7, Vista-64-ultimate.

I am using a Pioneer DVD-RW DVR-216D SATA. The HDD LED is
blinking at around one second intervals at a steady pace.
The blinking will stop if I disable it in device manager,
(then I cannot use it) or put a cd/dvd disk in and after the
device does its thing take it out and it will not blink
until the next boot up. I used gpedit and disabled autorun
both in HKLM and HKCU, not help. Any input will be
appreciated.

TIA