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This hard drive will be put in a DVR that records video from a few IP cameras. I found both of the following drives for about $80 each and would like to know which one would work the best.

2TB Caviar Green 5400RPM SATA 3Gb/s Intellipower 64 MB Cache (WD20EARS)

or a

1.5TB Seagate Barracuda 7200RPM SATA 3Gb/s 32MB cache (ST31500341AS)?

Does the extra cache make up for the slower spin speed?

Supposing the capacities were the same. what's more important, faster RPM or bigger cache?

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2 Answers 2

up vote 1 down vote accepted

No the extra cache will not make up fro the slower spin speed, see this previous question: Hard Drive Speed: RPM vs. Cache

Depending on the number of cameras and Frames Per Second you'll be recording at, the extra space may be more important than the spin speed on a DVR.

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I agree with, Aaron. I would go with more space when you are talking video storage, if you must pick between speed or capacity. –  Chadddada May 24 '11 at 13:51
    
The only deal is that both of these capacities are way more than they're used to. The DVR only records motion and anything over a TB will be gravy. Probably should edit the question :-) –  Jeff May 24 '11 at 17:37

From what I've read the difference between 32 and 64MB or cache on a hard drive is moot. Western Digital Blacks are right around your price range and size and have better speed than the greens.

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