Coverage Statements: Dental services provided for the routine care, treatment, or replacement of teeth or structures (e.g., root canals, fillings, crowns, bridges, dental prophylaxis, fluoride treatment, and extensive dental restoration) or structures directly supporting the teeth are generally excluded from coverage under Aetna's medical plans, ...
A hard disk drive (sometimes abbreviated as Hard drive, HD, or HDD) is a non-volatile memory hardware device that permanently stores and retrieves data on a computer. A hard drive is a secondary storage device that consists of one or more platters to which data is written using a magnetic head, all inside of an air-sealed casing.
Hard drive. Hard disk drive with case removed to show the platters and the read-write head. Disruptions to the hard drive's functioning can cause a computer to crash. Thumb drives are small external drives that can expand the storage space of a computer. An external hard drive.