The only thing I could think of is the HD's internal transfer rates might be slightly faster. Other than that its the industry trying to make you believe that you need 16 over 8. Kinda like everything else! lol.
Here is the difference between WD Cavier 200gb 8mb cache and WD Cavier 250gb 16mb cache,better transfer rates,less cpu usage and shorter access time. Price difference between a 250gb 8mb and 16mb cache WD is only 10$ so i think it worths.
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