best way to power extra hard disks

I want to add some extra hard drive but I don't think my current powersupply can handle it. The machine is an old mac so it would be problematic to upgrade the powersupply. What's the best way to power the extra hard drives?

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More about best power extra hard disks
  1. You can power them with a second power supply. Just short the green wire on the big 20-pin connector to one of the black ones and the PSU will turn on.

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