Questions about Hitach 2TB drives

[saiyan]

I have a few questions about Hitachi's 2TB drives.

Newegg currently has two SKUs listed for Hitachi 2TB drives:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822145298
http://www.newegg.com/Product/Product.aspx?Item=N82E16822145276

Does anyone know what is the difference between these two models?

Are they essentially the same model except one being an OEM bare drive and the other a retail packaged drive?

Do they have any TLER issue if I run them in RAID-5 configuration?

Thanks.