Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,678
Start>Control Panel>Power Options
for the selected plan - Change Plan Settings > Advanced Settings > Hard Disk > Turn hard disk off after > Setting: Never (set it to 0)
I see no reason to add an additional drive. It's certainly not easier than the above keystrokes. Additional drives would only be for backup/redundancy. And a USB drive/cloud backup is easier for that. Or for extremely high performance in a RAID array, But I suspect you're not looking for that.
Above is from my Win8 machine - I'm sure Visa/7/XP aren't too different.