areal density

(redirected from aerial density)

areal density

[‚er·ē·əl ′den·səd·ē]
(computer science)
The amount of data that can be stored on a unit area of the surface of a hard disk, floppy disk, or other storage device.

areal density

The number of bits per square inch of storage surface. It typically refers to disk drives, where the number of bits per inch (bpi) times the number of tracks per inch (tpi) yields the areal density.

From 2,000 to 100,000,000,000 Bits
The areal density of disk storage devices has increased dramatically since IBM introduced the RAMAC, the first hard disk computer in 1956. RAMAC had an areal density of two thousand bits per square inch, while current-day disks have reached 100 billion bits (100 gigabits per square inch). Perpendicular recording is expected to increase storage capacity even more dramatically. See perpendicular recording, superparamagnetic limit, holographic storage and AFM.

Rings on Dumbbells for Denser Memory


The areal density of memory chips is much greater than that of magnetic disks. However, in 2006, the California Institute of Technology built a prototype memory chip that used molecular switches resembling dumbbells with a ring that slides along the center bar. Voltage pushes the ring from one end to the other to represent a 0 or 1. Only in the early stage of development, the first prototype chip was no larger than a white blood cell and held 160,000 bits. If it were to become commercially viable, the density would exceed 600 billion bits per square inch. In addition, scientists claimed that improvements in this technology are expected that could make the bits 10 times denser. Such an achievement would yield six trillion bits per square inch!
References in periodicals archive ?
Prospects are good since the number of testers per disk is rising (as aerial density goes up, test time per disk also increases, thus the need for more testers).
FgSA enables considerable improvement in aerial density at a price that is at least 30% below the price of competing wireless suspension technologies," he added.
Samsung is offering cutting-edge technology from an aerial density standpoint with the new 1.
This 37 percent smaller spot incident will more than double the aerial density and substantially increase the data transfer rate.
A fundamental change to the architecture of the media, SMR technology rearranges the way data is stored on a disk by overlapping tracks similar to shingles on a roof thereby, increasing track density and improving aerial density.
Designers should establish a goal of providing a soldier with Level III protection with materials having, an aerial density of 1.
For example: the use of nets and sticky traps to measure aerial density at one or more altitudes (Greenstone et al.
As the drives continue to grow in capacity, there's a lot of apprehension from a customer standpoint on moving to a larger drive size from an aerial density standpoint.
Increases in HDD aerial density have driven improvements in MR preamp performance.
This enables the production of substrates for RF front-end modules with higher component aerial density compared to traditional solutions using ceramics.
For some time now, the data storage industry has been meeting this growing need by continually increasing aerial density in hard disks rather than increasing production capacity.
Prospects are good with the number of testers per disk rising (as aerial density goes up, test time per disk also increases, thus the need for more testers).

Full browser ?