| Multiple
Domain Orientation |
Due
to the omnipresent nature of computers, the necessity for an efficient and larger
storage has been drastically on the rise. The more the complex the system is,
the more the storage requirements become. Hard disks have a major role in satisfying
the needs of the computer users. Since storage density of hard disk is increasing
at rate of 60% per year [1] and is approaching its atomic level saturation, there
is a need for adapting some other technique to make maximum utilization of the
available space. With not many solutions in hand, this paper is a novel approach.
The
basis of this idea is that when an external magnetic field is applied to an Elongated
Single Domain (ESD), the domains get oriented in the direction of the external
field. This specific property can account for the existence of more than two states.
The domains are oriented in different directions each representing a new state
unlike the conventional hard disks where only two directions are made use of.
Thus each individual bit field* of the memory is capable of representing more
than one state thus allowing octal, decimal, hexadecimal etc. representations
instead of binary representation. Introduction:
In the today's cyber world, we are largely dependent on computers. With the advancement
of technology and complexity of computers, the need for massive storage is mandatory.
Hard disks have been a major storage media for the past several years. Hard disks
continue to shrink in size, gain increased storage capacity and increased transfer
speeds. The focus of development has been on increasing the density. But this
may ultimately lead to saturation to atomic levels one day. Hence in this paper,
on the basis of domain theory, different states have been given to an individual
bit field making it possible to store more information on a single bit field without
modifying its density.
Conventional
technology:
The parts of a hard disk include platters, spindle motor,
heads, and head actuator sealed from the outside. This chamber is often called
the head disk assembly (HDA). Platters are usually made of an aluminum alloy or
glass/ceramic coated with magnetically sensitive substance. The read/write heads
read and write to the platters. There is usually one head per platter side, and
each head is attached to a single actuator shaft so that all the heads move in
unison. Each head is spring loaded to force it into the platter it reads. Each
head rests on the platter surface when off. When the drive is running, the spinning
of the platters causes air pressure that lifts the heads ever-so-slightly off
the platter surface. In modern hard disks they float between 11nm above the disk.
The spindle motor is responsible for spinning the platters. They are set to spin
the platters at a set rate, ranging from 3600 RPM to 7200 RPM.
When
the disk rotates under the read/write head, it can either read existing data or
write new ones:
" If a current is applied to the coil, the head will
become magnetic. This magnetism will orient the micro magnets in the track. This
is write mode.
" If the head moves along the track without current applied
to the coil, it will sense the micro magnets in the track. This magnetism will
induce a current in the coil. These flashes of current represent the data on the
disk. This is read mode.
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