What is the Difference in these 2 External Hard Drives?

What are the differences between the My Book External Hard Drive 2 TB Model: WDBFJK0020HBK-NESN

and the My Book Essentials Hard Drive 2 TB Model: WDBACW0020HBK-NESN ?

Which is the newer model?

What is the Warranty length on both Models?

What is the speed of both Models?

WDBFJK0060HBK-NESN is a 6TB Drive

My bad - I forgot to change the 60 to 20 to reflect a 2 TB drive.
I went back & changed my initial post so as to not confuse others.

My Question was really about the differences in the two drives & not the capacity.

The link you provided is only to 1 of the drives & I had already been there.

What I canNOT seem to find is the link to the other drive.

WDBFJK is the newer model which does not have the power button and newew HBA.
WDBACW is the older model with power button on the back.

THANKS for this information - that is exactly what I was looking for.

Below is the response I got directly from WD.
It may help someone else.

**"**Let me explain to you that the WD My Book Essential is an old version of My Book. For that reason, some programs are not compatible with it.

Please, click on the links below to check the available programs from each drive:

WD My Book:

WD My Book Essential:

http://support.wdc.com/product.aspx?ID=125&lang=en"