Task: Sentence Expansion
Input (English): A hard disk drive ( HDD ) , hard disk or hard drive , is a data storage device for computers which uses magnetic storage to store data .
Output (English): A hard disk drive ( HDD ) , hard disk , hard drive , or fixed disk is an electro-mechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks ( platters ) coated with magnetic material .