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Computer file system
Non-Volatile File System (NVFS) is a flash memory file system introduced in the release of Palm's Personal Digital Assistant handheld models Tungsten
Non-Volatile_File_System
2004 Palm OS–based smartphone by Palm
significant number of users experienced problems with Palm's new Non-Volatile File System, or NVFS, based on the FAT filesystem. Compared to the Treo 600
Treo_650
Copy-on-write file system developed by Apple
Apple File Systems on unencrypted, non-Fusion storage devices. The specification for software encryption was documented later. The file system can be
Apple_File_System
Computer memory that does not lose its contents after being turned off
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retain stored information even after power is removed. In contrast
Non-volatile_memory
Type of computer memory
If the main memory of a computer system were non-volatile, it would greatly reduce the time required to start a system after a power interruption. Current
Non-volatile random-access memory
Non-volatile_random-access_memory
general and technical information for a number of computer file systems. All widely used file systems record a last modified time stamp (also known as "mtime")
Comparison_of_file_systems
Dillon. NOVA – The "non-volatile memory accelerated" file system for persistent main memory. ReFS (Resilient File System) – A file system by Microsoft with
List_of_file_systems
Type of data structure
a system image is a serialized copy of the entire state of a computer system stored in some non-volatile form, such as a binary compressed file. If
System_image
Copy-on-write file system
storage device non-volatile random access memory, referred to as NVRAM or NVMEM. WAFL provides mechanisms that enable a variety of file systems and technologies
Write_Anywhere_File_Layout
Temporary file system on Unix-like systems
provide a file system stored in volatile memory; however, the implementations differ. While tmpfs is implemented at the logical file system layer, a RAM
Tmpfs
Personal digital assistant
the Tungsten T5 and Treo 650, it used non-volatile flash memory, this time in the form of Non-Volatile File System, meaning that the data would be preserved
Palm_Tungsten
Computer memory that loses its contents when unpowered
Volatile memory, in contrast to non-volatile memory, is computer memory that requires power to maintain the stored information; it retains its contents
Volatile_memory
Interface used for connecting storage devices
NVM Express (NVMe, Non-Volatile Memory Express) or Non-Volatile Memory Host Controller Interface Specification (NVMHCIS) is an open, logical-device interface
NVM_Express
Cell phone manufactured by Palm Inc.
available from Telus Mobility. Operating System: Palm OS 5.4.9 Storage: 128 MB (60 user-accessible) Non-Volatile File System RAM Processor: Intel XScale 312 MHz
Treo_700p
Handheld PDA by Palm, Inc.
to a PC (so the wall-socket charger can be left at home). The Non-Volatile File System (NVFS), also known as NVRAM, ensures that data is never lost even
Z22_(handheld)
2007 smartphone by Palm
available from Telus Mobility. Operating system: Palm OS 5.4.9 Storage: 128 MB (60 user-accessible) Non-Volatile File System RAM Processor: Intel XScale 312 MHz
Treo_755p
File system for tracking pending changes
A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the goal of such changes
Journaling_file_system
Computer science concept
circular buffers. NOVA (filesystem) or "non-volatile memory accelerated", an open-source log-structured file system for byte-addressable persistent memory
Persistent_memory
Real-time operating system
Thread, Bluetooth Low Energy, CAN) A virtual file system interface with several flash file systems for non-volatile storage (FatFs, LittleFS, NVS) Management
Zephyr_(operating_system)
Mobile operating system
official Dynamic Input Area API in Palm OS 5.3. Palm added the Non-Volatile File System in Palm OS 5.4, and used Flash for storage instead of DRAM, preventing
Palm_OS
Component that stores information
memory: volatile and non-volatile. Examples of non-volatile memory are flash memory and ROM, PROM, EPROM, and EEPROM memory. Examples of volatile memory
Computer_memory
Computer memory used for small quantities of data
type of non-volatile memory. It is used in computers, usually integrated in microcontrollers such as smart cards and remote keyless systems, or as a
EEPROM
Open-source file system
(non-volatile memory accelerated) file system is an open-source, log-structured file system for byte-addressable persistent memory (for example non-volatile
NOVA_(filesystem)
Chemical with a high vapor pressure at room temperature
Volatile organic compounds (VOCs) are organic compounds that have a high vapor pressure at room temperature. They are common and exist in a variety of
Volatile_organic_compound
Configuration file format
INI file format is not rigidly defined, many parsers support features beyond those that form the common core. Implemented support is highly volatile. Attempts
INI_file
Novel computer memory type
photolithography, and forms the NRAM cell. The NRAM acts as a resistive non-volatile random-access memory (RAM) and can be placed in two or more resistive
Nano-RAM
Discontinued computer memory type
3D XPoint (pronounced three-D cross point) is a discontinued non-volatile memory (NVM) technology developed jointly by Intel and Micron Technology. It
3D_XPoint
log-structured file system implementations. James T, Brady while in IBM Poughkeepsie Lab conceived a log structured paging file system in 1979 which was
List of log-structured file systems
List_of_log-structured_file_systems
File system where data is stored as collections of records
record-oriented file system is a file system where data are stored as collections of records. This is in contrast to a stream file system, where the data
Record-oriented_file_system
Data storage device
dynamic RAM (DRAM), which uses a transistor and a MOS capacitor per cell. Non-volatile memory (such as EPROM, EEPROM and flash memory) uses floating-gate memory
Semiconductor_memory
Keyword used in some programming languages to tag variables
be volatile if its value can be read or modified asynchronously by something other than the current thread of execution. The value of a volatile variable
Volatile (computer programming)
Volatile_(computer_programming)
Non-volatile memory technology
The programmable metallization cell, or PMC, is a non-volatile computer memory developed at Arizona State University. PMC, a technology developed to replace
Programmable metallization cell
Programmable_metallization_cell
Ability to guarantee database transactions
likely to evolve as the popularity of non-volatile memories (NVM) technologies grows. In systems that include non-volatile storage, durability can be achieved
Durability_(database_systems)
Standard directory in Microsoft Windows
made accessible to the rest of the system via the volatile environment variables %ProgramFiles%, and %CommonProgramFiles%. Applications can also obtain the
Program_Files
Type of computer memory
Magnetoresistive random-access memory (MRAM) is a type of non-volatile random-access memory which stores data in magnetic domains. Developed in the mid-1980s
Magnetoresistive_RAM
Computer resource for recording data on a storage device
operating systems store files on a hard disk. Hard disks have been the ubiquitous form of non-volatile storage since the early 1960s. Where files contain
Computer_file
Proposed form of computer storage
device combining the cost benefits of DRAM, the speed of SRAM, the non-volatility of flash memory along with infinite durability, and longevity. Such
Universal_memory
Form of non-volatile memory used in computers and other electronic devices
Read-only memory (ROM) is a form of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified
Read-only_memory
Database management system that primarily relies on main memory for computer data storage
changes to the database in a journal file and facilitates automatic recovery of an in-memory database. Non-Volatile DIMM (NVDIMM), a memory module that
In-memory_database
Novel computer memory type
Racetrack memory or domain-wall memory (DWM) is an experimental non-volatile memory device under development at IBM's Almaden Research Center by a team
Racetrack_memory
Novel type of computer memory
Electrochemical Random-Access Memory (ECRAM) is a type of non-volatile memory (NVM) with multiple levels per cell (MLC) designed for deep learning analog
Electrochemical_RAM
Computer storage device with no moving parts
drives, which all use a mechanically driven storage medium. SSDs rely on non-volatile memory, typically NAND flash, to store data in memory cells. The performance
Solid-state_drive
Type of computer memory used from 1955 to 1975
system is powered down (non-volatile memory). However, when the core is read, it is reset to a "zero" value. Circuits in the computer memory system then
Magnetic-core_memory
Temporary storage for deleted files
other files. Users could drag unwanted files onto it and empty the bin later. In early versions of the Macintosh Finder, Trash contents were in volatile memory
Trash_(computing)
Software that manages computer hardware resources
computers, unlike volatile dynamic random-access memory (DRAM), are still accessible after a crash or power failure. Permanent (non-volatile) storage is much
Operating_system
Novel type of computer memory
Resistive random-access memory (ReRAM or RRAM) is a type of non-volatile (NV) random-access (RAM) computer memory that works by changing the resistance
Resistive random-access memory
Resistive_random-access_memory
File format developed by Motorola
HEX file. The HEX file is then imported by a programmer to write the machine code into non-volatile memory, or is transferred to the target system for
Motorola_S-record
Early type of solid state computer memory
data after a power supply has been turned off and back on is called non-volatile. It is an array of floating-gate transistors individually programmed
EPROM
Unix command to commit all data in the kernel filesystem to non-volatile storage buffers
sync is a standard system call in the Unix operating system, which commits all data from the kernel filesystem buffers to non-volatile storage, i.e., data
Sync_(Unix)
is somewhat popular for sensitive data storage because the media is non-volatile and does not degrade over time. However, large-scale storage is impractical
Linear_Flash
Type of computer memory
require data to be refreshed. Unlike flash memory, DRAM is volatile memory (as opposed to non-volatile memory), since it loses its data quickly when power is
Dynamic_random-access_memory
Linux standard for directory structure
5 October 2025. "File System Standard" (PDF). Linux Foundation. 5.11.1. Purpose. Retrieved 5 October 2025. "Chapter 2. File System Structure and Maintenance"
Filesystem_Hierarchy_Standard
Type of computer memory
(RAM) that uses latching circuitry (flip-flop) to store each bit. SRAM is volatile memory; data is lost when power is removed. The static qualifier differentiates
Static_random-access_memory
Novel type of computer memory
Millipede memory is a form of non-volatile computer memory. It promised a data density of more than 1 terabit per square inch (1 gigabit per square millimeter)
Millipede_memory
Persistent computer data storage with no moving parts
Solid-state storage (SSS) is non-volatile computer storage that has no moving parts; it uses only electronic circuits. This solid-state design differs
Solid-state_storage
Novel computer memory type
(ovonic unified memory) and C-RAM or CRAM (chalcogenide RAM)) is a type of non-volatile random-access memory. PRAMs exploit the unique behaviour of chalcogenide
Phase-change_memory
RAM used to emulate secondary storage
tasks and protect non-volatile storage devices from wearing down, since RAM is not prone to wear from writing, unlike non-volatile flash memory as used
RAM_drive
Recovery of evidence from mobile devices
The boundary scan produces a complete forensic image of the volatile and non-volatile memory. The risk of data change is minimized and the memory chip
Mobile_device_forensics
Novel type of computer memory
ferroelectric layer instead of a dielectric layer to achieve non-volatility. FeRAM is an alternative non-volatile random-access memory technology that offers the same
Ferroelectric_RAM
Device that installs firmware on a device
is a device that writes, a.k.a. burns, firmware to a target device's non-volatile memory. Typically, the target programmable chip is one of the following
Programmer_(hardware)
Operating principle for certain storage media
When these systems are used on flash memory media, this becomes a problem. The problem is aggravated by the fact that some file systems track last-access
Wear_leveling
Header file for C programs
macro expands to an lvalue with type int, sometimes with the extern and/or volatile type specifiers depending upon the platform. Originally this was a static
Errno.h
Write once computer memory
headquarters. OTP (one time programmable) memory is a special type of non-volatile memory (NVM) that permits data to be written to memory only once. Once
Programmable_ROM
Variant of magnetic-core computer memory
read mode,[citation needed] requiring a write after read to restore data. Non-destructive read mode was possible, but this required much greater uniformity
Plated-wire_memory
Data storage device
to power internal capacitors until the iNAND cached data transfers to non-volatile NAND. Late 2011 and early 2012 benchmarks using an SSHD consisting of
Hybrid_drive
Technology for maintenance of file systems
In the maintenance of file systems, defragmentation is a process that reduces the degree of fragmentation, files that are stored in multiple segments that
Defragmentation
Technique for inserting fault tolerance into computing systems
the required data from the memory to reliable storage (e.g., parallel file system), then continue with execution. In the case of failure, when the application
Application_checkpointing
Data system company
(kB). The original system had 2kB of non-volatile magnetic core memory. The final version of the 1301 had 12kB of memory. The system supported eight keystations
Inforex_1300_Systems
Pseudorandom number generator file in Unix-like operating systems
available supply of entropy from the environment may be limited. For a system with non-volatile memory, they recommend saving some state from the RNG at shutdown
/dev/random
Early form of read-only memory
Dimond at Bell Laboratories for Bell's Number Five Crossbar Switching System, a type of electromechanical telephone switch. When a telephone user made
Core_rope_memory
Storage of digital data readable by computers
into non-volatile storage before the batteries are exhausted. Some systems, for example EMC Symmetrix, have integrated batteries that maintain volatile storage
Computer_data_storage
Replaceable device used for the distribution and storage of video games
via an edge connector; the cartridge was memory mapped directly into the system's address space such that the CPU could execute the program in place without
ROM_cartridge
Early high speed computer memory
number of high-speed computer projects, including the high-end of the IBM System/360 line, but general advances in core tended to keep pace. "Thin Film"
Thin-film_memory
Planetary system consisting of the Sun and objects orbiting it
outer Solar System contain a higher proportion of volatiles such as water, ammonia, and methane, than planets of the inner Solar System because their
Solar_System
Computer memory type used for data preservation
the so-called five dimensions. The concept is to store data optically in non-photosensitive transparent materials such as fused quartz, which has high
5D_optical_data_storage
Storage layer in high-performance computing
Sato, Kento; Yu, Weikuan (November 2016). "An Ephemeral Burst-Buffer File System for Scientific Applications". SC16: International Conference for High
Burst_buffer
Database for Microsoft Windows
folder. A fifth subkey, HARDWARE, is volatile and is created dynamically, and as such is not stored in a file (it exposes a view of all the currently
Windows_Registry
Type of field-effect transistor
– a type of single transistor non-volatile memory and also in artficial neuron circuits . In 1955, Ian Munro Ross filed a patent for a FeFET or MFSFET
Fe_FET
Computer storage product
system, specially optimized for storage functions at high and low levels. All NetApp ONTAP-based hardware appliances have battery-backed non-volatile
NetApp_FAS
2-D grid of wires where data is represented by the presence or absence of diodes at nodes
These activated columns may be used as control signals for some connected system, or may represent computer data or instructions. A diode matrix is one technique
Diode_matrix
Archive file format created for Microsoft Windows
distribute firmware updates from hardware vendors that can be flashed on non-volatile memory. The .cab filename extension is also used by other installer programs
Cabinet_(file_format)
Free virtualization and emulation software
PMAC-IDE-Interfaces with hard disk and CD-ROM support. NE2000 PCI adapter Non-volatile RAM VIA-CUDA with ADB keyboard and mouse. OpenBIOS is used as the firmware
QEMU
Type of memory used on graphics cards
cluster Directory Shared resource File sharing File system Clustered file system Distributed file system Distributed file system for cloud Distributed data store
GDDR_SDRAM
Recording of information in a storage medium
over telecommunications systems in 2002 was nearly 18 exabytes—three and a half times more than was recorded on non-volatile storage. Telephone calls
Data_storage
Computer memory management scheme
data in memory-mapped files on memory-backed file systems, such as the tmpfs file system or file systems on a RAM drive, and map files into and out of the
Memory_paging
Term for abstraction in computer programming
that has an effect on the code is magic. Memory-mapped I/O addresses and volatile variables are also magic in this sense, although the term is not normally
Magic_(programming)
Data storage device
was disputed by M-systems and Singaporean company Trek 2000 but Netac remained as the holder of the patent. Netac went on to file legal battles domestically
USB_flash_drive
computer's volatile memory (RAM). They are often used in incident response situations to preserve evidence in memory that would be lost when a system is shut
List of digital forensics tools
List_of_digital_forensics_tools
Obsolete type of non-volatile computer 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
Bubble_memory
Type of memory used on processors that require high transfer rate memory
the system performance and reduce energy consumption by more than 70%, while not requiring any hardware or software changes to the rest of the system. Samsung
High_Bandwidth_Memory
electronic device or embedded system is said to be field-programmable or in-place programmable if its firmware (stored in non-volatile memory, such as ROM) can
Field-programmability
Data storage technology
a caching system that reports the data as written as soon as it is written to cache, as opposed to when it is written to the non-volatile storage medium
RAID
Method to store and retrieve computer data using optics
Optical storage is a class of data storage systems that use light to read or write data to an underlying optical media. Although a number of optical formats
Optical_storage
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
List_of_RAM_drive_software
Medium capable of storing data in a format readable by a machine
Photochemical Electrical Semiconductor used in volatile RAM microchips Floating-gate transistor used in non-volatile memory cards Radio transmission Magnetic
Machine-readable medium and data
Machine-readable_medium_and_data
Electronic non-volatile computer storage device
Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash
Flash_memory
Process of starting a computer
other code) into non-volatile memory. After system reset, the microcontroller begins to execute code programmed into its non-volatile memory, just like
Booting
Form of computer memory
and dynamic random-access memory (DRAM). Non-volatile RAM has also been developed and other types of non-volatile memories allow random access for read operations
Random-access_memory
Early type of computer memory
War II radar research, as a system to reduce clutter from reflections from the ground and other non-moving objects. A radar system consists principally of
Delay-line_memory
Computer memory architecture
underlying support from the operating system): Programmers are responsible for moving data between disk and memory through file I/O. Hardware is responsible for
Memory_hierarchy
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