Finding the magnetic disk
drive head in the image and aligning the head with a model previously taught to the system must be done with subpixel accuracy.
In addition to offering far higher capacity and data rates, the new technology does not require a flying head--the mechanism that reads data from or writes data to a magnetic disk
or tape--and, therefore, eliminates the possibility of "head crashes," the bane of existing hard drives.
This automatic process keeps space available on the server's magnetic disks
and leaves room for loading files from the optical storage library.
which is 10 or 20 times lower than today's magnetic disk
drives and this moderate areal density leads to volumetric densities of over a Tb/cubic inch.
Some vendors who have a vested interest in selling magnetic disk
systems have tried to narrowly define ILM as containing only layers of hard disk systems with varying levels of performance, reliability and cost.
Systems using rewritable magnetic disks
cannot provide the same level of audit trail verification as true Write Once media and are challenged to meet archival storage regulations that demand stringent data authentication.
Establishing a Data Retention and Protection Policy: Tape, Magnetic Disk
, or Optical Media?
areal density has grown at an impressive 60% compound annual growth rate historically and has accelerated to greater than a 60% rate since 1999.
We are now approaching the delivery of 70 gigabits per square inch for magnetic disk
technology, with demonstrations over 130 gigabits per square inch routinely occurring in laboratories.