This year, 2012, digital plastic substrate magnetic tape turns 60
years old. The IBM 726 digital tape drive was introduced in 1952 to
provide larger amounts of digital storage for computers, in particular
IBM’s 701 computer. Before the introduction of magnetic tape, digital
storage for early computers used punched cards, paper tape as well as
more exotic technologies such as mercury delay lines and the phosphors
on cathode ray tubes.
Magnetic tape technology for
analog, mostly sound, recording had been used for commercial uses since
at least the 1930’s. Many different approaches to record sound with
magnetic recording for were developed over the years since the first
demonstration of magnetic recording on steel wires by Danish inventor,
Vladimir Poulsen, sometime between 1893 and 1898. Note that an
American, Oberlin Smith, described how magnetic recording could be done
on magnetic impregnated thread or steel wire in 1888.
In
the 1940’s German radio stations broadcast Hitler speeches from
several radio stations at one time using the Magnetophone magnetic tape
recorders, which used iron oxide coatings on plastic substrates. These
analog magnetic tape machines led to the development of audio and
video recording technologies after WWII by companies such as Ampex.
During
my recent visit to the FAME studio in Muscle Shores, I was surprised to
discover they are still using a 16 track audio recorder with 2-inch
tape. They also had ProTools, but said analog recording is still desired
by the very customers of this old-time recording studio. However, it is
getting very hard to obtain raw tape for the recorder.
Univac
introduced a metal substrate tape and tape recorder for computer
digital recording in 1951. However with the introduction of lighter
weight and more flexible plastic substrate magnetic tapes, combined
with a vacuum column to control the tension that the magnetic tape
experiences during use, the IBM 726 was a prototype of the modern
digital tape recording system.
Since the 1950s there have
been many generations of magnetic computer tapes of various widths and
thickness and using various types of recording methods including
multi-track linear recording (the technology generally in use today)
as well as helical scan recording (like the recording in the old VCR
video recorders) to full transverse recording (where the recorded
information tracks are perpendicular to the direction of tape motion.
Over
the years, since 1952, magnetic tape recording storage capacities have
increased from 2.3 MB to 5 TB (an increase of over a million times)
and much of the world’s digital information is kept on digital tape for
long term archiving. It is estimated that more than 400 Exabytes of
data now reside on digital magnetic tape.
Backup and
archiving remain the biggest applications for digital magnetic tape
although it is also used as a physical data transport device (as the
old saying goes, you can ship more data on tape in a delivery truck
over a shorter time than you can send electronically). There are
several modern digital tape storage products in production, such as
Oracle’s T10000 and IBM proprietary tape formats, but the most popular
modern digital tapes are in the LTO tape format.
The LTO
tape consortium (led by HP, IBM and Quantum) has a public tape product
roadmap that will take magnetic tape technology out to about 13 TB of
native (uncompressed) storage capacity. The current generation, LTO 5,
has 1.5 TB of native storage capacity. According to Fujifilm and
others in the industry, magnetic tape technology can eventually support
storage capacities of several 10’s of TB in one cartridge. Much of
these increases in storage capacity will involve the introduction of
technologies pioneered in the development of magnetic disk drives.
In
addition to a higher storage capacity than past LTO generations, LTO 5
also offers new architecture features such as the LTFS file system
that turn magnetic tape into a directly addressable data source, like a
hard disk drive. This assists in rapid access to the data on digital
tape and is one of the key technologies to support the development of
cloud based archive technologies such as the Permivault technology
recently introduced by Fujifilm.
With total stored
information growth exceeding 50% annual increases, high capacity, low
cost storage technologies such as digital magnetic tape will continue
to play an important role. Magnetic digital tape makes the digital
society that we live in today accessible to more people than ever
before and helps preserve this digital heritage for the future.
Modern
digital magnetic tape turns 60 this year but despite its age, the
technology looks like it is far from retiring. Like today’s modern
workers we can expect this hardworking technology to continue to play an
important role for many years to come. Me, I'm watching from the
sidelines.
Thursday, August 30, 2012
Subscribe to:
Post Comments (Atom)
The LTO Tapes changes there capacity according to the generations so there you have an interesting topic for share good luck for next topic.
ReplyDelete