WD oems have 3yr, which is good.
Some do, which is good. Some have 5-year, which is better. Some have only 1-yr.
WD Warranties
Protégé & WD Caviar - Bare drive: 1-year , Retail kit: 1-year
WD Caviar® SE - 3-year , 1-year
WD Raptor - 5-year, 5-year
External Drives - N/A, 1-year
Mobile Drives - 3-year, 1-year