How to figuring serial 80G hard drive is Seagate 8M cache, or 2M

Users questions:
Experts answer: low-end of the 5400 rpm hard drive to use more two kinds of capacity 512K and 2M cache, mainstream 7,200 rpm hard drive cache is generally 2M and 8M, and the serial number SerialATA hard drives equipped with a 8M cache.
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