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  2. Units of information - Wikipedia

    en.wikipedia.org/wiki/Units_of_information

    Units are defined as multiples of a smaller unit except for the smallest unit which is based on convention and hardware design. Multiplier prefixes are used to describe relatively large sizes. For binary hardware , by far the most common hardware today, the smallest unit is the bit , a portmanteau of binary digit, [ 1 ] which represents a value ...

  3. Orders of magnitude (data) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(data)

    The storage limit using the 48-bit LBA ATA-6 standard introduced in 2002. 1.6 × 10 18 bits (200 petabytes) – total amount of printed material in the world [citation needed] 2 × 10 18 bits (250 petabytes) – storage space at Facebook data warehouse as of June 2013, [11] growing at a rate of 15 PB/month. [12] 2 61: 2,305,843,009,213,693,952 ...

  4. Byte - Wikipedia

    en.wikipedia.org/wiki/Byte

    The byte is a unit of digital information that most commonly consists of eight bits. 1 byte (B) = 8 bits (bit).Historically, the byte was the number of bits used to encode a single character of text in a computer [1] [2] and for this reason it is the smallest addressable unit of memory in many computer architectures.

  5. Microdrive - Wikipedia

    en.wikipedia.org/wiki/Microdrive

    It was the smallest hard drive in the world at the time, being 2.0" × 1.44" × 0.414" (50.8mm × 36.5mm × 10.5mm) in size while offering 20, then later 40 MB of storage capacity. [2] The Kittyhawk was a colossal failure, and was withdrawn 2 years later in 1994. [3] In 1996, HP shut down its Disk Memory Division and exited the market. [4] [5]

  6. Computer data storage - Wikipedia

    en.wikipedia.org/wiki/Computer_data_storage

    Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. [1]: 15–16 The central processing unit (CPU) of a computer is what manipulates data by performing computations.

  7. Disk storage - Wikipedia

    en.wikipedia.org/wiki/Disk_storage

    The first commercial digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system. The random-access , low-density storage of disks was developed to complement the already used sequential-access , high-density storage provided by tape drives using magnetic tape .

  8. File size - Wikipedia

    en.wikipedia.org/wiki/File_size

    File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte. A large value is often expressed with a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). [1]

  9. Density (computer storage) - Wikipedia

    en.wikipedia.org/wiki/Density_(computer_storage)

    Optical discs store data in small pits in a plastic surface that is then covered with a thin layer of reflective metal. Compact discs (CDs) offer a density of about 0.90 Gbit/in 2, using pits which are 0.83 micrometers long and 0.5 micrometers wide, arranged in tracks spaced 1.6 micrometers apart.

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