Pretty decent I'd imagine if it isn't showing up in their. I'm not sure whether Mandrake ships with it by default, however, hopping on over to Mandrakes page shows me you can download hdparm from a mirror ftp. Go here to get it.
ftp://ftp.nmt.edu/pub/linux/mandrake/9.0/i586/Mandrake/RPMS/hdparm-5.2-1mdk.i586.rpm
Hope that helps some.