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A 500 GB Western Digital hard disk drive with a 16 MB buffer In computer storage , a disk buffer (often ambiguously called a disk cache or a cache buffer ) is the embedded memory in a hard disk drive (HDD) or solid-state drive (SSD) acting as a buffer between the rest of the computer and the physical hard disk platter or flash memory that is ...
RAM drive software allows part of a computer's RAM (memory) to be seen as if it were a disk drive, with volume name and, if supported by the operating system, drive letter. A RAM drive has much faster read and write access than a hard drive with rotating platters, and is volatile, being destroyed with its contents when a computer is shut down ...
RAM drives use normal system memory as if it were a partition on a physical hard drive rather than accessing the data bus normally used for secondary storage. Though RAM drives can often be supported directly in the operating system via special mechanisms in the OS kernel, it is generally simpler to access a RAM drive through a virtual device ...
Scratch space is space on the hard disk drive that is dedicated for storage of temporary user data, by analogy of "scratch paper." [ 1 ] [ 2 ] It is unreliable by intention and has no backup . Scratch disks may occasionally be set to erase all data at regular intervals so that the disk space is left free for future use.
Otherwise, obtain an empty page frame in RAM to use as a container for the data, and: Determine whether the page was ever initialized; If so determine the location of the data on disk. Load the required data into the available page frame. Update the page table to refer to the new page frame.
The operating system will place actively used data in RAM, which is much faster than hard disks. When the amount of RAM is not sufficient to run all the current programs, it can result in a situation where the computer spends more time moving data from RAM to disk and back than it does accomplishing tasks; this is known as thrashing.
Associated with speed, the more RAM there is in the system, the faster the computer can run, because it allows the RAM to run more information through to the computer's (CPU). Not only does adding more RAM to a computer help it run faster, it helps boots up a computer immensely faster compared to booting up a system with less RAM.
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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