Hitachi的ATA硬碟8MB cache是保固三年
請看 這個Hitachi網頁

Warranty Period -
Ultrastar Products - 5 years

Deskstar Products, all 8MB cache buffer models - 3 years

Deskstar Products, 512K or 2MB cache buffer models sold prior to November 15, 2002 - 3 years

Deskstar Products, 512K or 2MB cache buffer models sold on or after November 15, 2002 - 1 year

Travelstar Products - 3 years

Microdrive Products - 1 year