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OWC Dual-drive Power Supply Options

Last updated 2011-01-31 - Send Feedback
Related: backup, hard drive, Other World Computing, RAID, RAW, storage

Both the Guardian MAXimus Mini and Elite-AL Pro Dual Mini require a separate power cable when connected by eSATA or USB 2.0. The means either a Firewire cable, or an external power supply (included with the Guardian MAXiumus Mini, but not the Elite-AL Pro Dual Mini).

Travel with one cable

When connected with Firewire 800, it’s one cable for power and data, very neat and clean— no power brick to carry along.

With a 8" long Firewire 800 cable, travel is simple. But even desktop Mac users will like the single cable, to keep things tidy on the desktop. However, using an external power supply (wall wart) keeps the Firewire 800 port available for other uses.

AC power adapter

The Guardian MAXimum Mini ships with an external power supply included, but it is optional for the Mercury Elite-AL Pro Dual Mini. I’d prefer to see OWC include it with both units.

Using the external power supply does not use a Firewire port, and reduces any potential for strain on the Firewire bus, especially should you connect additional Firewire devices in daisy-chain mode, which could attempt to draw too much power.

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Power usage

Using a WattsUp power meter, I measured power draw as shown below.

The 750+750 config is with the 7200 rpm drives, which will naturally draw more power than 5400 rpm drives, which were not tested.

The Mercury Elite-AL Pro Dual Mini draws slightly more power than the Guardian MAXimus Mini.

The SSD model makes a compelling argument for travel, because it draws less than 1/3 the power under full load, and about 40% of the power at idle, as compared to the dual 750GB 7200 rpm hard drives. Also, the SSD model has no spin-up power draw as with a hard drive.

Power draw (watts) Idle Continuous Write
Continuous Read
Elite-AL Pro Dual Mini 750+750 7.4 11.8 8.6
Elite-AL Pro Dual Mini SSD+SSD 2.7 3.0 2.9
Guardian MAXimus Mini 750+750 6.8 10.8 8.1

 


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