TIPS: Warranty for Computer Hardware

Normally before we buy something, we will asked about warranty of product. 1 week, 1 month, 3 months, 6 months, 1 years, 3 years or life time warranty. But there is something you need to know, example last Monday I bought 2 unit 160GB SATA HDD for laptop and the salesman said the HDD 3 years warranty. Actually the HDD 1 years warranty from the shop and 3 years warranty from factory. If the HDD