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Puch Cards
The first generation of digital computing it was mostly used for input of programs and data. a typical punch card could look like, a 90 column card.They were used as early as 1725 in the textile industry. -
Punched tape
Same as with a puch Cards, punched tape was originally pioneered by the textile industry for use with mechanized looms. punch tapes where used for data input but also as a medium to output data. Each row on the tape represents one character, -
Magnetic drum memory
The magnetic drum was a 16 inch long drum spun that did 12,500 revolutions per minute.
it was used in the 1950s and 60s as the main working memory of computers. In the mid-1950s, magnetic drum memory had a capacity of 10 kB. -
Selectron tubes
the largest selectron tube measured 10 inches and could store 4096 bits. They were very exspensive so they didn't last very long on the market. -
Magnetic tape
Magnetic tape was first used for data storage in 1951. One roll of magnetic tape could store as much data as 10 000 punch cards. The tapes were metal and 365 meters long and they were very heavy. It became very succesfull and it became the most popular way of storing of computer data until the mid 1980s. -
The hard disk drive
n 1956 IBM introduced the first hard drive - IBM 305 RAMAC. The first hard drive had more than 1 GB. It was the size of a refrigerator and weighed 250 kg.
The hard disk drive has become a standard component for most personal computers.This data storage scheme uses multiple hard drives to share or replicate data among them. storing data on hard disks became an attractive and handy solution because of the improvements. -
Compact Cassette
The Compact Cassette is one kind of a magnetic tape.It was introduces through Philips in 1963 but it didn't become poplair until the 1970's. A standard 90 minutes Compact cassette could store about 700kB to 1MB of data on each side of the tape.
A Compact Cassette was a popular way of data storage for personal computers in the late 70s and 80s -
The floppy disc
In 1969 the first floppy disk was introduced. It was a read-only that could store 80kB of data. Four years later, in 1973, a similar floppy disk with the same size could store 256kB of data, and it was rewritable. In the late 1990s you could store 250 MB of data.
They could not store as much data as a harddisk but they were much more flexibleand cheaper. They were used to move small pieces of data around foppy disks began to be widely used for backup uses. -
The Laserdisc
It was mostly uused for movies. It wasn’t possible to store data on the discs, but they could store video and image. The first Laserdisc was 30 cm in diameter. The discs could have up to 60 minutes of audio/video on each side. -
The compact disc
It is like a Laser disc only it's smaller and stores less data.
A normal CD today can store 700 MB of data. -
DVD
A DVD (Digital Versatile Disc or Digital Video Disc) is just as a CD only it uses a different sort of laser technology.
You can put more data on a DVD than a CD.
dual layer DVD can store 8.5GB of data. -
Flash Drives and Data Backup
Portable USB storage flash drives are very populair storage devices. The smallest of these drives stores several times more data than a traditional 3,5 inch floppy disk, and larger ones can hold as much data as a CD-ROM or even more. -
Microdrive
The Microdrive was developed by IBM with a storage of 170 MB, in 2006 the storage was 8 GB. They weigh about 16 g.
They were the smallest hard drives in the world at the time. -
Blu-ray
Blu-ray uses the shorter wavelength blue-violet laser.
It can store up to 25GB on a single-layer disc. -
Holographic Versatile Disc (HVD)
WikipediaIt is disc that is as big as a CDrom. In the future, may hold up to 6TB of information. Currently it can hold 500GB.
