What the main differences on WD Slim, Edge and Ultra

I am hearing hard disk product version of WD.

I want to know the comparisson in features and prices of Slim, Edge and Ultra versions of portable hard disks. Ultra and Slim differences I was able to find it in under products-> portable drives but didnt get a good comparisson of Edge version.

Just want to know how it against the Slim and Ultra versions

Hello, for more info on the Passport Edge, you can check the Product Specifications PDF. Follow the link below. 

http://www.wdc.com/wdproducts/library/AAG/ENG/4178-705449.pdf