Dual drive just means that you have two HDDs or SSDs installed in your system.
I'm currently working on a tutorial now to show you how to enable DIPM if wanted. It's only a AHCI Link Power Management
option that gets enabled in your Advanced Power Plan Settings
that allows you to be able to manage the HIPM/DIPM settings for a SSD. It's optional, and doesn't need to be turned on unless you just wanted to try and save some energy while the SSD is idle.
I'll post back with a link to the new tutorial when I get it finished later on.