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  2. Comparison of popular optical data-storage systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_popular...

    Differences are noted below. DVD-RAM, which did not gain wide penetration of the consumer market, is discussed briefly in the same section but otherwise excluded from the article. ROM formats are excluded; they perform rather like write-once "R" formats, without the capacity to write to the disc.

  3. Random-access memory - Wikipedia

    en.wikipedia.org/wiki/Random-access_memory

    Writable variants of ROM (such as EEPROM and NOR flash) share properties of both ROM and RAM, enabling data to persist without power and to be updated without requiring special equipment. ECC memory (which can be either SRAM or DRAM) includes special circuitry to detect and/or correct random faults (memory errors) in the stored data, using ...

  4. Read-only memory - Wikipedia

    en.wikipedia.org/wiki/Read-only_memory

    For example, users modifying or replacing the Android operating system describe files containing a modified or replacement operating system as "custom ROMs" after the type of storage the file used to be written to, and they may distinguish between ROM (where software and data is stored, usually Flash memory) and RAM. ROM and RAM are essential ...

  5. DDR2 SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR2_SDRAM

    PC2-5300 DDR2 SO-DIMM (for notebooks) Comparison of memory modules for desktop PCs (DIMM) Comparison of memory modules for portable/mobile PCs (SO-DIMM) The key difference between DDR2 and DDR SDRAM is the increase in prefetch length. In DDR SDRAM, the prefetch length is two bits for every bit in a word; whereas it is four bits in DDR2 SDRAM.

  6. DDR4 SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR4_SDRAM

    DDR4 RAM operates at a voltage of 1.2 V and supports frequencies between 800 and 1600 MHz (DDR4-1600 through DDR4-3200). Compared to DDR3, which operates at 1.5 V with frequencies from 400 to 1067 MHz (DDR3-800 through DDR3-2133), DDR4 offers better performance and energy efficiency. DDR4 speeds are advertised as double the base clock rate due ...

  7. Programmable ROM - Wikipedia

    en.wikipedia.org/wiki/Programmable_ROM

    It is one type of read-only memory (ROM). PROMs are used in digital electronic devices to store permanent data, usually low level programs such as firmware or microcode. The key difference from a standard ROM is that the data is written into a ROM during manufacture, while with a PROM the data is programmed into them after manufacture. Thus ...

  8. Template:Google templates - Wikipedia

    en.wikipedia.org/wiki/Template:Google_templates

    Edit; View history; Tools. Tools. move to sidebar hide. ... This template is for "See also" sections of the documentation subpages of the Google search templates it ...

  9. Non-volatile random-access memory - Wikipedia

    en.wikipedia.org/wiki/Non-volatile_random-access...

    Non-volatile random-access memory (NVRAM) is random-access memory that retains data without applied power. This is in contrast to dynamic random-access memory (DRAM) and static random-access memory (SRAM), which both maintain data only for as long as power is applied, or forms of sequential-access memory such as magnetic tape, which cannot be randomly accessed but which retains data ...

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