No difference except for the "certification" which probably just means somebody actually tested it. I bought a cheap Fantom 500GB eSATA drive about 6 months ago for around $100, plugged it into the SA DVR, and it recognized it right away. Any eSATA hard drive should work just fine.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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No difference except for the "certification" which probably just means somebody actually tested it. I bought a cheap Fantom 500GB eSATA drive about 6 months ago for around $100, plugged it into the SA DVR, and it recognized it right away. Any eSATA hard drive should work just fine.