Ahh.. hdparm is using a feature not present in the empeg kernel. And oddly enough, it doesn't even need that feature for this. I've placed a revised hdparm.empeg file onto my server (same place as before). Give that one a try and see if it works for you. It will probably still show ONE error, but maybe not TWO errors. You can use "-I" to see whether it's having any effect or not.

Cheers