hard disk storage device

hard disk definition

A hard disk consists of several disk platters, which are attached to the same central spindle

platter of hard disk

Each platter has two surfaces, and thus there is a read/write head for each surface

hard disk surface

The layout of a disk surface is similar to that of a floppy disk. That is, on each surface there are a number of tracks, each of which divides into a number of sectors.

needs to access information on hard disk

To access information on a hard disk, we need to specify the cylinder number, head number and sector number, but not track number, because each cylinder corresponds to a track on each of the surfaces

hard disk Vs floppy disk

a hard disk is like a collection of floppy disks. But all the disk platters in a hard disk, including the read/write heads, are kept in a sealed metal box.

why not need track number in access information on hard disk

because each clyinder correspond to a track on each of the surfaces

hard disk and platters , cylinders

hard disk, which consists of several disk platters, we can say that the hard disk is divided into a set of concentric cylinders

hard disk

magnetic storage device with one or more thin metal platters or disks that store information sealed inside the disk drive.

speed of platters of hard disk

the disk platters to spin at a higher speed (from 3,600 rpm to 10,000 rpm)