Completed in October 1981, the FACOM 6421 was a magnetic disk unit from Fujitsu which used small diameter media with a diameter of 10.5 inches first in the world.
A story about how a magnetic disk storage device that played an important role to support the substantial evolution of computers was born from IBMEngineering and Technology History Wiki(ETHW)It is revealed in.
They are used mainly for eliminating non-metallic inclusions and hydrogen gas from aluminum used for cans, copy drums, magnetic disks, sashes, and automotive components.
S250This was a small general-purpose computer, whose CPU was comprised of main memory and 5 distributed processors an arithmetic processor, system control processor, service processor, magnetic disk processor and communications control processor.
Floatingly Connectable Channel Unit The mainframes which read and write magnetic disks have to make the channel units control transferring data. The channel units are located between the computer and the disk units.
And despite being in a state where problem solving was not completely done, Johnson declined to abandon the choice of any other storage, and decided to unify the development target into a magnetic disk type.
Although similar to magnetic disk units, the magnetic heads of these drum units do not move, allowing for faster read and write speeds than magnetic disks.
With the development and growth of magnetic drums and magnetic disks, magnetic tape became primarily used as a storage media and smaller cartridge formats were introduced to reduce the size of the units.
Around the middle of the 1980s, after prices of magnetic disks and terminals fell, the role of the punch card in data input for computers suddenly diminished, and work of a keypuncher soon became obsolete.
When compared to magnetic discs and magnetic tape, the Blu-ray disc, which was appropriate for long-term preservation, had the weaknesses of insufficient memory capacity and of being slow in reading speed and writing speed.
Among devices that preserve a variety of data are devices with semiconductor flash memories such as magnetic discs, magnetic tape, and USB memory. Further, there are DVDs, Blu-ray discs, and other optical discs..
While the above description gives the case where the magnetic disk card 40 b is selected as a subject of recording, the present invention is not limited thereto and the same applies to the case where the memory card 40 a is selected as a subject of recording.
The external memory 15 is configured by a magnetic disk drive, for example, and stores various programs such as a game program for executing an online game in the terminal device 30 and a control program for controlling the progress of the online game.
This MVR single-frame recorder had been demonstrated at the July 1965 SMPTE meeting in San Francisco, capable of recording 20 seconds of black-and-white video as 600 single frames on a shiny aluminum magnetic disc coated with nickel cobalt.
We also received orders for the world's most advanced devices one after another, such as a roll coater for film formation as a device ordered by the Bank of Canada to prevent use of counterfeit bills and an inline spattering system for magnetic disk production from Komag Inc.
While improving the performance of the thin-film magnetic disk developed for PATTY, the research center developed a new thin-film magnetic head for high-speed operation and thereby achieved a surface recording density of 62 Kbit/mm2 and a data transfer speed of 4.4 MB/s.
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