Western digital wordbook power adapter(wd10000d033)

I was recently given one of these without the power adapter . I know it requires 12 volts but how many amps?

I have a 12 volt 3 amp power supply that fits but have not tried it yet.

I have found a picture of the original power adapter on line but no specs for it.

Any help would be greatly appreciated.

MyBookWorld II(Blue Rings) Power Adapter Specs:

4 Amps at 12 Volts DC

Model-DA-48M12 AC