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  2. Memory type range register - Wikipedia

    en.wikipedia.org/wiki/Memory_Type_Range_Register

    This often increases the speed of image write operations by several times, at the cost of losing the simple sequential read/write semantics of normal memory. Additional bits which are provided on some computer architectures , such as AMD64 , allow the shadowing of ROM contents in memory (shadow ROM), and the configuration of memory-mapped I/O .

  3. Write protection - Wikipedia

    en.wikipedia.org/wiki/Write_protection

    These mechanisms are intended to prevent only accidental data loss or attacks by computer viruses. A determined user can easily circumvent them either by covering a notch with adhesive tape or by creating one with a punch as appropriate, or sometimes by physically altering the media transport to ignore the write-protect mechanism.

  4. Memory protection - Wikipedia

    en.wikipedia.org/wiki/Memory_protection

    The page tables are usually invisible to the process. Page tables make it easier to allocate additional memory, as each new page can be allocated from anywhere in physical memory. On some systems a page table entry can also designate a page as read-only.

  5. Write-only memory (engineering) - Wikipedia

    en.wikipedia.org/wiki/Write-only_memory...

    To add a data FIFO without breaking compatibility with the 8250 UART's eight configuration registers, the write-only "FIFO control register" was assigned the same port address as the read-only "interrupt identification register". Writes to that address program the FIFO control register, but there is no way to read it back.

  6. Forensic disk controller - Wikipedia

    en.wikipedia.org/wiki/Forensic_disk_controller

    A forensic disk controller or hardware write-block device is a specialized type of computer hard disk controller made for the purpose of gaining read-only access to computer hard drives without the risk of damaging the drive's contents.

  7. Copy-on-write - Wikipedia

    en.wikipedia.org/wiki/Copy-on-write

    Copy-on-write can be implemented efficiently using the page table by marking certain pages of memory as read-only and keeping a count of the number of references to the page. When data is written to these pages, the operating-system kernel intercepts the write attempt and allocates a new physical page, initialized with the copy-on-write data ...

  8. Write once read many - Wikipedia

    en.wikipedia.org/wiki/Write_once_read_many

    WORM drives preceded the invention of the CD-R, DVD-R and BD-R.An example was the IBM 3363. [1] These drives typically used either a 5.1 in (13 cm) or a 12 in (30 cm) disc in a cartridge, with an ablative optical layer that could be written to only once, and were often used in places like libraries that needed to store large amounts of data.

  9. Replay Protected Memory Block - Wikipedia

    en.wikipedia.org/wiki/Replay_Protected_Memory_Block

    A Replay Protected Memory Block (RPMB) is provided as a means for a system to store data to the specific memory area in an authenticated and replay protected manner and can only be read and written via successfully authenticated read and write accesses. The data may be overwritten by the host but can never be erased.