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Punch Card
As early as 1725 Basile Bouchon used perforated paperloop in a loom to establish the pattern to be reproduced on cloth They were used up to the late 19th century -
Punched tape
Punched tape consistsof a long strip of paper in which holes are punched to store data. This led to the concept of communicating data not as a stream of individual cards, but one "continuous card", or a tape. -
Phonograph
When one would speak into a mouthpiece, the sound vibrations would be indented onto the cylinder by the recording needle in a vertical (or hill and valley ) groove pattern The Phonograph was developed as a result of Thomas Edison's work on two other inventions, the telegraph and the telephone. -
Williams tube
Professor Frederick C. Williams and colleagues at Manchester University in the United Kingdom developed the first random access computer memory, through using electrostatic cathode-ray display tubes as digital stores. The Williams-Kilburn tubes (commonly known as Williams tubes) were used on several of the early stored program computers, including the Manchester 'Baby' (1948) and the Manchester Mark I which became operational in 1949, and the Institute of Advanced Study (IAS) machine spearheade -
Hard Disk
A hard disk uses rigid rotating platters Information is written to the disk by transmitting an electromagnetic flux through an antenna or write head that is very close to a magnetic material, which in turn changes its polarization due to the flux. -
CD (Compact Disk)
A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. The 120mm discs can hold 74 minutes of audio, and versions holding 80 or even 90 minutes have been introduced. -
CD-ROM
The CD-ROM, an abbreviation for “Compact Disk Read-Only-Memory”, is an optical data storage medium using the same physical format as the audio compact discs. The CD-ROM, an abbreviation for “Compact Disk Read-Only-Memory”, is an optical data storage medium using the same physical format as the audio compact discs. -
DVD
DVD is essentially a bigger, faster CD that can hold cinema-like video, better-than-CD audio, still photos, and computer data. It has replaced laserdisc, is well on the way to replacing videotape and video game cartridges, and could eventually replace audio CD and CD-ROM. -
SD card (Secure Digital)
cards are based on Toshiba's older Multimedia Card (MMC) format, but add little-used DRM encryption features and allow for faster file transfers, as well as being physically slightly thicker. SD cards are currently available in sizes up to and including 2 GB, and are used in almost every context in which memory cards are used, and in nearly every application, they are the most popular format. -
Blue Ray Disk
Blu-ray Disc is a next-generation optical disc format meant for high definition video (HD) and high density data storage, and is one of two competing standards for HD optical media. Blu-ray gets its name from the shorter wavelength (405 nm) blue laser