Table 3: Prediction of Areal density and Track Density during the magnetic recording density evolution with Grain Density or particles density conjecture.

Linear Density or Areal Density

 

Track Density (tpi)
(tracks per inch)

Particle Density (ppci)
(particles per cubic inch

LD = 104 bits/in [21]

AD = 106 bits/in2 (1974)

100

2 × 1015

LD = 120 × 103 bits/in [71]

AD = 2 GBits/in2 (1992)

17 × 103

2 × 1017

LD = 52.2 × 104 bits/in [72]

AD = 50.2 GBits/in2 (2000)

90 × 103

2 × 1020

LD = 80 × 104 bits/in [73]

AD = 100 GBits/in2 (2008)

125 × 103

2 × 1023