PSU and harddrive connection

I was just wondering if i had a lead coming from my PSU that had three molex connectors on it, would it be ok to connect it to three hard drives? I remembering hearing somewhere that you should try to only put 2 harddrives/devices on any one line.

thanks in advance

There's no problem having three hard drives on the same power supply as long as the power supply can output enough power.
How big is your power supply? (In watts not size )
I've seen somewhere on the internet a list of the approximate power needed for each device in a compter. Have a google around and work out if your power supplt will be powerful enough.
Hope that helps