I am looking to buy a hard drive but before I do I was wondering what the difference is between these two Western Digital hard drives. They have different model numbers I am guessing that just has to do with the production date.
http://www.ebay.com/itm/Western-Dig...877?pt=LH_DefaultDomain_0&hash=item2a4275e46d
http://www.ebay.com/itm/Western-Dig...587?pt=LH_DefaultDomain_0&hash=item58b7f32623
http://www.ebay.com/itm/Western-Dig...877?pt=LH_DefaultDomain_0&hash=item2a4275e46d
http://www.ebay.com/itm/Western-Dig...587?pt=LH_DefaultDomain_0&hash=item58b7f32623