Assertion: hard drive's platter | /r/HasProperty | coated with magnetic material
Facets:
Source sentences:
text: A hard disk drive (HDD), hard disk, hard drive, or fixed disk[b] is an electro-mechanical data storage device that uses magnetic storage to store and retrieve digital data using one or more rigid rapidly rotating platters coated with magnetic material.
text: The platters are not magnetic but are coated with magnetic material.