Why does my backup drive keep burning out?

I've burned out three backup hard drives within the last year and a half The first was a Buffalo 500G, then a Toshiba 500G and then another Buffalo 500G. The first backup was had its own power supply but the other two got their power from my Mac. Time Machine settings were all normal but I did notice the drive's light seemed to be on a lot when Time Machine was not backing up. The power to my Mac and the drives is stable and relatively consistent.
Has anyone else had this problem and is there a solution for it? Losing three drives in less than 18 months makes me think it's a Mac software issue as opposed to poor quality drives. Thanks for any insight.

That drive is bus powered, as Klaus1 suggested ONLY use EHD's that have their own power supplies.
The drive I would recommend is:
http://eshop.macsales.com/item/Other%20World%20Computing/MAU4S7500G16/
OR
http://eshop.macsales.com/item/Other%20World%20Computing/MEAQ7500GB16/
Of the two I prefer the latter.

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Why does my backup drive keep burning out?

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