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Personally, I wouldn't use two IDENTICAL drives. Otherwise, if you get a dud, you will likely get two duds, that might die in the same way, and close to the same time. It seems this is exactly what happened in your case. I try to use two or more different brands, or at the very least use drives of a different age. Although you might have data a day out of date, I can't argue too much with a nightly mirror, as I do that myself. If you're using a second computer, you can help eliminate a bad power supply destroying both drives. If you're really nutty, you can put the second drive off-site, and will be covered in case of fire or theft.
Specific brands will vary based on personal preference. I tend to like Samsung, and still use Seagates due to the warranty.
Expect one of these to be at least $1500 , depending on the problem. The WD5000KS drives are a nightmare to work on, and the success rate is low.
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