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1920 Magnetic Tape
Fritz Pflemuer, patentedn magnetic tape, he based this on the invnetion of Vlademar Poulsen's magnetic wire. -
Drum Memory
This is magnetic data storage divice invented by Gustav Tauschek, this memory was widely used in the 1950s and into the 1960s. The drum was large metal cylinder, coated on the outside surface with a ferromagnetic recording material. This is the Precurssor to the Hard Disk platter. -
Williams Tube
The Williams tube(Williams-Kilburn tube). This was a cathode ray tube used as a computer memory ro electronically store binary data. It was the first random-access digital storage device and was used for several years -
Selectron Tube
This was an early form of digital computer memory created bt Jan A. Rajchman and his group at RCA und the direction of Vladimir Zwrorykin. It weas a vacuum tube that stored digital data as electostatic charges using technology simmilar to the Williams tube storage device. -
Delay Line Memory
A form of computer memory used on early digital computers, like many modern forms of electronic memory, delat line memory was refreshable memory, but compared to modern RAM, delay line memory was sequential-access. -
Magnetic-core memory
Was the predominant form of random-access computer memory for 20 rears(circa 1955-75). It uses tiny magnetic toroids, the cores through whic wires are threaded to write and read info. Each core represents on bit of information. -
First HDD
The IBM 350 disk file, invnted by Reynold Johnson, was introduced in 1956 wirh the IBM #)% RAMAC computer. This drive had fifty 24 inch platters with a capacity of 3.75 megabits a single head assembly was used for acsess to all the platters, yielding an average access time of just under one second -
DRAM(Dynamic random-access memory)
Type of RAM that stores each bit of data in a separatecapacitor within an intergrated circut. The cpacitor can be either charfed or discharged -
Twistor Memory
A form od computer memory formed by wrapping magnetic tape around a current-cattying wire. Operationally twistor was very similar to core memory. Twistor could also be used to make ROM memories, including a re-programmable form known as "piggyback twistor" -
Bubble Memory
A type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, know as "bubbles" or "domains" each storing one bit of data. The material is arranged to from a series of parallel tracks that the bubbles can move inder the action of an external magentic felid. The bubbles read by movinf them to the edge of the material where they can be read by a conventional mahentic pickup. -
8 inch floppy disk
This was the first floppy disk, it was 8 inches in diameter, protected by a flexible plastic jacket and was a read-only device used by IBM as a way of loading micropcode. They became acailble in 1972 but it was IBMs 1973 introduction of the 3740 data entry system that established floppy disks -
5.25 inch floppy disk
To compete with the 80-track high density, the 5.25 is smaller than a 40-track double-desinty drive but can format, read and write 40-track disks well provided the controller supports double stepping or has a switch to do so. -
CD
This is digital optical disc data storage format. The format was originally developed to store and play ont sound recordins but was later adapted for storage of data (CD-ROM) Several other formats ere further derived form theses, including write-once audio and data storage (CD-R), rewritable media (CD-RW) Video Compact Disc (VCD), Super Video Compact Disc (SVCD) Photo cd, Pictured cd and CD-i -
3.5 inch Floppy Disc
A number of manufactures intoduced smaller floppy drives and media in various foramts. A consortium of 21 companies eventually settled on a 3.5 inch floppy disc , The most common format is the HD 1.44 MB disk drive, shipped in 1986 -
The MiniDisc (MD)
This is an obsolete magneto-optical disc based data storafe for 74 minutes and later, 80 minutes of digitized audio -
Compact Flash
A Flash memory mass storage device used mainly in portable elctronic -
DVD
Also called Digital versatile disc or digital video disc. This is digital disc storage format, invented and developed by Philipls, Sony, Toshiba and Panasonic. These can be played in a lot of players and offer higher storage than CDs -
MultiMediaCard
The MMC is a memory card standard used for solid-stated storage, Released in 1997 by SanDisk and Siemens AG it is based on NAND-based flash memory, the card itself is the size of a stamp. They come in sizes up to 128gb -
Microdrive
These were small 1inch disk drives designed to fit into CompactFlash type II slots. When they first releasd the only had 20 mb and only weighed 28gb but they now release in 12gb -
Blu-Ray Disc
The latest digital optical disc data storage, this was designed to take over the dvd format, This can store HD (1080p). The conventional disc contains 25gb per layer, they have dual layer dics. The dual layer si the standard for full length movies. There are triple and quadruple layers avalible -
Cloud Storage
Cloud storage is a model of data storage where the digital data is stored in logical pools, the physical storage spans multiple servers (and often locations), and the servers are often owned by hosting companys. Some common programs for this are, Drop box, Google Drive, and Apple iCloud. -
HD DVD
This is a discontinued high-density optical disc format for storing data nad hd video. This format was made to compete with Blu-Ray, It came in a single layer that stored 15gb, and a dual layer that stored 30gb. -
Zip Drive
The Zip drivw is a medium-capacity removalbe floppy disk storage system that was introduced by lomega om late 1994. They originally launched 100mb then it was upgraded to 750mb
