I contacted WD.
Thank you for contacting Western Digital Customer Service and Support. My name is Hector A.
We apologize for the confusion. The model WD Caviar Green WDBAAY0030HNC-NRSN is the same as the WD Caviar Green WD30EZRSDTL. Please find more details below.
WD Caviar Green Desktop Hard Drives: http://www.wdc.com/wdproducts/library/S ... 701229.pdf
If you have any further questions, please reply to this email and we will be happy to assist you further.
Western Digital Service and Support