Shawn, this is very interesting tip of yours.
After install the Add_AHCI_Link_Power_Management_Option.reg
file, it appears my default state is HIPM in the Advanced Power Settings management both battery & wired powered because looks i'm on a Intel RST limited system configuration that will not allow me to directly link HIPM + DIPM together.
Therefore in the default registry key "iaStor", DIPM & LPM are already set to 1= Enabled for my computer. LPMSTATE is also set in iaStor Key to 0= Partial.
That's mean i'm on "Partial" state and not "Slumber".
"Partial" transistion looks the most common state for best performances when Idle for HDD/SSD & Optical drives.
It is not clear for me if my system will turn automatic from "Slumber" transition (HIPM + DIPM) to "Partial" transition (HIPM).
[correcting]:It is not fully supported till after the S-ATA AHCI ICH9M Intel's chipset. (actually mine).
I do not know if i do force both state HIPM+DIPM for a long idle period, if it will be very efficient and will return it to Partial enough fast.
Otherwise most more recent Intel's chipset should do it.
So, set on "Active" should not slow down activities on the Hard Drive & Optical Drive consumption....during idle
Might read at closer look the link from Intel...
Thanks i'm studying it!!!