There's a reason they did this.
It used to be that enterprise series harddrives and standard consumer models both had the exact same warranty period. Consumer models are not meant to be used 24/7 in high data access enviroments. The enterprise series stuff is much more expensive but since the same warranty was available on the much cheapter consumer models, many companies would just buy the cheaper models and then warranty them when they failed.
You'll notice the warranty period remains the original length on the enterprise series models.
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