power draw for modern 7200rpm drives?

ouch

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I've been given a SFF compaq that I'm re-purposing as a fileserver. It comes with a mITX motherboard which runs from a single 18v external power brick. It powers its single HDD and DVD RW from a 4pin molex style connection on the board.

In an ideal world I'd like to fit a PCI-E Raid controller to run a pair of 1TB drives in raid 1 config, with a smaller drive to run the OS.

What are the chances of this succeeding given the original intention of the mobo was to power a single drive and a DVD RW? Has anyone got any figures as to the power draw of a DVD RW drive compared to spinning discs?

(I could reduce the power load by using a small SSD for the OS, but I've got a ton of smallish harddiscs that are rapidly turning into paperweights, I'd rather use one of them than spend out further)
 
The power specs are usually in the datasheets or product manuals.

A 3.5" 7200 RPM HDD can draw as much as 25W during spinup. If you are really concerned about power draw during this time, then you should configure your RAID for staggered spinup or Power Up In Standby (PUIS).