What's the difference between these 2 drives?

Soldato
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I need more storage space and I'm looking at the 2TB WD Black drives that OCUK sell but I'm confused by the 2 part numbers, WD2002FAEX and WD2003FZEX respectively. Both appear to be the same but one is cheaper than the other so what's the difference?
 
Taken from Western Digital's PDF on the WD Black series:

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Full PDF here: http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-771434.pdf
 
My advice is go with the WD2003FZEX.

It's a brand new revision/model in the black range that was released about a month ago and has better read and write times.

I am currently considering the 4TB version.
 
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