A hard disk drive consists of one or more thin disks that spin at high speed (1200 to 15000 rpm) while magnetic heads read data from them, hovering extremely close to them without making contact.
magnetic hard disk drives
Hard Disk Drive, Floppy Drive
The flash drive has no moving parts and thus is faster than the traditional spinning drive storage devices.
It contains what ever you want it to
Hard disk drives are a highly popular medium of computer storage because of their enormous capacity compared to other media. As a disadvantage, they are more costly and, depending on the type, have a limited lifetime.
hard disk save data on platters. On platters there are tracks and sectors in which the data is saved.
A hard disk drive (HDD), commonly referred to as a hard drive, hard disk, or fixed disk drive, is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces.Source: http://en.wikipedia.org/wiki/Hard_drive
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I believe that you mean to ask if hard disk drives are considered volatile storage media or not. Volatile memory is memory that is lost when the storage medium is not being supplied with electricity. Hard drives do not need power for storage, only for reading and writing data from and to the platters; this means that hard drives are not volatile storage media.
A computer's hard disk or hard drive stores information such has the operating system, programs, and files. It stores the information as small magnetic fields on the hard disc.A hard disk drive is a non-volatile storage device that stores digitally encoded data on rapidly rotating rigid (i.e. hard) platters with magnetic surfaces.
Hard Drive