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by Dinesh Thakur Category: Memory

Flash Memory (sometimes called "Flash RAM") is a type of RAM that, like a ROM, retains its contents when the power supply is removed, but whose contents can be easily erased by applying a short pulse of higher voltage. This is called flash erasure, hence the name. Flash memory is currently both too expensive and too slow to serve as MAIN MEMORY, but is used as removable storage cards for digital cameras and pocket computers.



 
by Dinesh Thakur Category: Memory

OCR stands for optical character recognition, a wonderful and marvellous technology. It enables you to convert previously printed text material into information your computer can understand, without having to retype it. Have you ever had a story or an article or a magazine clipping that you wanted to have in your computer, but the thought of retyping the entire thing was overwhelming? Or just boring? That's what OCR is for.



 
by Dinesh Thakur Category: Memory

Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles or domains, each storing one bit of data. Andrew Bobeck invented the Bubble Memory in 1970. His development of the magnetic core memory and the development of the twistor memory put him in a good position for the development of Bubble Memory.



 
by Dinesh Thakur Category: Memory

In computing, Sequential Access Memory (SAM) is a class of data storage devices that read their data in sequence. This is in contrast to random access memory (RAM) where data can be accessed in any order. Sequential access devices are usually a form of magnetic memory.



 
by Dinesh Thakur Category: Memory

There are two types of relational integrity rules

Entity Integrity: - No attribute participating in the primary key of a base relation allowed containing any nulls. Primary key performs the unique identification function in a relational model. Thus a null primary key value within a base relation would be like saying that there was some entity that had no known identity. An entity that cannot be identified is a contradiction in terms, hence the name entity integrity.

 
by Dinesh Thakur Category: Memory

DDRAM: - Short for Double Data Rate-Synchronous DRAM, a type of SDRAM that supports data transfers on both edges of each clock cycle (the rising and falling edges), effectively doubling the memory chip's data throughput. DDR-SDRAM also consumes less power, which makes it well suited to notebook computers. DDR-SDRAM is also called SDRAM II And DDRAM.



 
by Dinesh Thakur Category: Memory

Some Random Access Memory (RAM) chips have built-in error-checking functions that use a process called parity. Chips that use parity have an extra bit for every eight bits of data. In the parity process, as the eight bits receive binary data (data represented by 1s and 0s), the chip adds all the 1s, and if that total is odd, the extra bit is set to 1.



 
by Dinesh Thakur Category: Memory

Hard Disk Access time is the total elapsed time between the initiation of a particular request for data and receipt of the first bit of that data.

Direct access devices (Hard Disk Drive) require varying times to position a disk head over a particular record. In the case of a moving-head disk drive, this involves positioning the comb (head assembly, as in Fig.) to the designated cylinder, plus rotation of the selected track to the desired record. Comb-movement times for a typical medium-sized disk drive are shown in Fig.



 
by Dinesh Thakur Category: Memory

Auxiliary memory is the lowest-cost, highest-capacity, and slowest-access storage in a computer system. It is where programs and data are kept for long-term storage or when not in immediate use. Such memories tend to occur in two types-sequential access (data must be accessed in a linear sequence) and direct access (data may be accessed in any sequence). The most common sequential storage device is the magnetic tape, whereas direct-access devices include rotating drums, disks, CD-ROMs and DVD-ROMs.



 
by Dinesh Thakur Category: Memory

A type of computer memory from which items may be retrieved by matching some part of their content, rather than by specifying their ADDRESS (hence also called associative or content-addressable memory.) Associative memory is much slower than RAM, and is rarely encountered in mainstream computer designs.



 

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