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TeraStor Near Field
Recording Technology
Compared to
Hard Disk & MO

Characteristic

Winchester

Magneto Opticall

Near Field

Media

Substrate

 Aluminum/Glass

 Glass/Plastic

 Plastic

Recording Surface

Top

Bottom

Top

Tracks defined by

Servo Track Writer (STW)

Stamped

Stamped or STW

Drive

Write/Read Technology

Magnetic Field

Far Field

Near Field

Writing Process

Coil Switching

Constant Coil
(2 Pass)

 Coil Switching

Writing Limit

Induction/Gap
Flying Height

Objective Lens

Solid Immersion Lens (SIL)

Reading Process

Inductive, MR

Kerr Effect

Kerr Effect

Head Spacing Servo Required

No

Yes

No

Read Channel

PRML

PWM

PRML

Direct Overwrite

Yes

No

Yes

Known Density Limits

Super Paramagnetic Limit

Laser Wavelength
Low NA

Orders of Magnitude Beyond
Known Limits of Winchester & MO

Major Capacity Enabler and Limiter

Flux sensor
Gap
Flying Height

 Objective Lens
Numerical Aperture
(NA)

Solid Immersion Lens (SIL)

 

 

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