The number of bits of data that can be recorded onto the surface of a disk or platter usually measured in square inches. The areal density is calculated by multiplying the bit density (BPI - Bits Per Inch) by the track density (TPI - Tracks Per Inch).
The amount of data that can be stored on a hard drive's disks, usually expressed in megabits per square inch.
The number of bits of data that can be recorded onto the surface of a disk or platter usually measured in square inches. Areal density, also sometimes called bit density, refers to the amount of data that can be stored in a given amount of hard disk platter "real estate". Since disk platters surfaces are of course two-dimensional, areal density is a measure of the number of bits that can be stored in a unit of area. It is usually expressed in bits per square inch (BPSI).
This typically refers to the amount of data that can be stored on a one-inch square of material. It's usually represented in billions of bits per square...
Bit density multiplied by track density, or bits per square inch of the disk surface. Bit density is measured around a track, and track density is radially measured.
Important indicator of the disk (and drive) performance. Corresponds to the number of magnetic bits per unit area usually measured in inches.
number of flux transitions per square unit of recordable area, or bits per square inch