Program for automatic HD spindown?

Ok, after looking all over, and trying all of the things suggested by
people on this group and other forums, I can not get my SATA drive to
spindown automatically :(

I can, however, do a manual spindown via "hdparm -y /dev/sda." So I
figured, perhaps another approach. Is there a program that would monitor HD
activity, and perhaps time of inactivity. I was thinking that perhaps I
could make a script, or something, that would simply run the manual
spindown command when it reaches a given time of inactivity. Any
suggestions on the way to do the bash script, or perhaps a program which
already does this?

- Bogdan