In addition, a preamplifier is integral to the write process by driving current through the inductive write head
, which records information on the platter.
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Alps realized even higher recording density for the recording surface of the write head
through the use of the vertical recording system that has been proven to boost recording density, and by shifting from the previous longitudinal system to the perpendicular system.
In hard drives, for example, the damping process is important for the write head
that generates field pulses, the media that switch to record the field pulses as a magnetization pattern, and for the read head sensors that detect the fields from the recorded pattern.
The servo write head
is a mirror image of a single servo frame with two non-parallel write gaps on the recording surface.
The write head
must be able to produce a much stronger magnetic field than at low frequencies in order to write the data on a disk and the read head must be very sensitive to fight the excessive electronic noise that occurs at such a high data rate.
Achieving superior reliability results on the Travelstar 5K160 involved major changes to both the write head
and the recording media.
Some key parameters of the demonstration are: a track density of 45,800 tracks per inch, a linear bit density of 520,000 bits per inch, a raw data rate of 159 Mb/s, using a merged, untrimmed GMR read/inductive write head
, and a multilayer thin film disc featuring exceptionally narrow magnetic grain size distribution.
Use of new PMR write head
greatly improved soft error rate through ability to write smaller data bits more sharply and with greater fidelity;
another researcher on the team, jokes that the write head
used in the experiment--a 2-mile-long linear accelerator--"is a bit clumsy.
The active servo elements are always arranged to be on the opposite head 'bump' to the read/write elements, preventing interference from the write head
However, the fields that can be applied are limited by the magnetic materials from which the write head