Old Storage Devices

In: Computers and Technology

Submitted By Bhai
Words 767
Pages 4
The Selectron tube
The Selectron tube had a capacity of 256 to 4096 bits (32 to 512 bytes). The 4096-bit Selectron was 10 inches long and 3 inches wide. Originally developed in 1946, the memory storage device proved expensive and suffered from production problems, so it never became a success. Above: The 1024-bit Selectron.
Punch cards
Early computers often used punch cards for input both of programs and data. Punch cards were in common use until the mid-1970s. It should be noted that the use of punch cards predates computers. They were used as early as 1725 in the textile industry (for controlling mechanized textile looms). Above: Card from a Fortran program: Z(1) = Y + W(1) Above left: Punch card reader. Above right: Punch card writer.
Punched tape
Same as with punch cards, punched tape was originally pioneered by the textile industry for use with mechanized looms. For computers, punch tape could be used for data input but also as a medium to output data. Each row on the tape represented one character. Above: 8-level punch tape (8 holes per row).
Magnetic drum memory
Invented all the way back in 1932 (in Austria), it was widely used in the 1950s and 60s as the main working memory of computers. In the mid-1950s, magnetic drum memory had a capacity of around 10 kB. Above left: The magnetic Drum Memory of the UNIVAC computer. Above right: A 16-inch-long drum from the IBM 650 computer. It had 40 tracks, 10 kB of storage space, and spun at 12,500 revolutions per minute.
The Hard Disk Drive
The first hard disk drive was the IBM Model 350 Disk File that came with the IBM 305 RAMAC computer in 1956. It had 50 24-inch discs with a total storage capacity of 5 million characters (just under 5 MB). Above: IBM Model 350, the first-ever hard disk drive.
The first hard drive to have more than 1 GB in capacity was the IBM 3380 in 1980 (it could…...

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