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JBD, or journaling block device, is a generic block device journaling layer in the Linux kernel written by Stephen Tweedie from Red Hat. JBD is filesystem-independent
Journaling_block_device
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
Network storage protocol
On Linux, network block device (NBD) is a network protocol that can be used to forward a block device (typically a hard disk or partition) from one machine
Network_block_device
Journaling file system for IRIX and Linux
spanning multiple physical storage devices. XFS ensures the consistency of data by employing metadata journaling and supporting write barriers. Space
XFS
Interface to device driver that appears in filesystem
There are two general kinds of device files in Unix-like operating systems, known as character special files and block special files. The difference between
Device_file
Topics referred to by the same term
to: Journaling block device, a Linux kernel function Jernbanedirektoratet, the Norwegian Railway Directorate Jet blast deflector, a safety device that
JBD
Distributed replicated storage system for Linux
Distributed Replicated Block Device (DRBD) is a distributed replicated storage system for the Linux platform. It mirrors block devices between multiple hosts
DRBD
Property of the ACID database system
copies of data, using journaling (see journaling file system). Databases usually implement this using some form of logging/journaling to track changes. The
Atomicity_(database_systems)
Structure containing file system metadata
the superblock is read to determine critical parameters such as block size, journaling state, and AG structure. If the superblock is unreadable, the mount
Superblock_(file_system)
File system
JFS supports the following features. JFS is a journaling file system. Rather than adding journaling as an add-on feature like in the ext3 file system
JFS_(file_system)
Shared-disk file system for Linux computer clusters
size and thus prevents uninitialised blocks appearing in a file under node failure conditions. The default journaling mode is data=ordered, to match ext3's
GFS2
High-powered loudspeaker
A long-range acoustic device (LRAD), acoustic hailing device (AHD), or sound cannon is a specialized loudspeaker and sound weapon that produces sound at
Long-range_acoustic_device
Concept in computing
A device fingerprint or machine fingerprint is information collected about the software and hardware of a remote computing device for the purpose of identification
Device_fingerprint
Disk encryption software
a transparent block device encryption subsystem in Linux kernel versions 2.6 and later and in DragonFly BSD. It is part of the device mapper (dm) infrastructure
Dm-crypt
Journaling file system for Linux
Linux, 8 KiB block size is only available on architectures which allow 8 KiB pages, such as Alpha. There are three levels of journaling available in the
Ext3
Log-structured file system for flash memory devices
Journalling Flash File System version 2 or JFFS2 is a log-structured file system for use with flash memory devices. It is the successor to JFFS. JFFS2
JFFS2
Journaling filesystem based on ext3
Next3 is a journaling file system for Linux based on ext3 which adds snapshots support, yet retains compatibility to the ext3 on-disk format. Next3 is
Next3
Semiconductor device capable of handling large amounts of electricity
semiconductor device is a semiconductor device used as a switch or rectifier in power electronics (for example in a switched-mode power supply). Such a device is
Power_semiconductor_device
Software to maintain ext* file systems
by ASCIIbetical order, are: badblocks search a device for bad blocks blkid locate/print block device attributes chattr change file attributes on a Linux
E2fsprogs
Signal to a computer processor emitted by hardware or software
instead indicate a fatal error. Interrupts are commonly used by hardware devices to indicate time-sensitive electronic or physical state changes that require
Interrupt
Long-acting form of birth control involving a device placed in the uterus
intrauterine device (IUD), also known as an intrauterine contraceptive device (IUCD or ICD), is a small, T-shaped birth control device that is inserted
Intrauterine_device
environments. ReiserFS – File system that uses journaling Reiser4 – File system that uses journaling, newest version of ReiserFS Reliance – Datalight's
List_of_file_systems
Log-structured file system
The Journaling Flash File System (or JFFS) is a log-structured file system for use on NOR flash memory devices on the Linux operating system. It has been
JFFS
American financial services company
device and a compact card reader, lowering the upfront cost and complexity traditionally associated with card acceptance. According to Forbes, Block,
Block,_Inc.
have case-sensitivity. Metadata-only journaling was introduced in the Mac OS X 10.2.2 HFS Plus driver; journaling is enabled by default on Mac OS X 10
Comparison_of_file_systems
Financial services provided by Block, Inc.
Handheld POS Device and Release Schedule". Digital Transactions. Retrieved 2025-12-30. Mason, Emily (May 27, 2025). "Jack Dorsey's Block Plans Bitcoin
Square_(financial_services)
Implementation of loop unrolling in C
In the C programming language, Duff's device is a way of manually implementing loop unrolling by interleaving two syntactic constructs of C: the do-while
Duff's_device
Australian software engineer (born 1959)
kernel, and a co-maintainer of the Ext3 file system, the journaling layer for block devices (JBD) and memory management. In the late 1980s, he was one
Andrew Morton (computer programmer)
Andrew_Morton_(computer_programmer)
Journaling filesystem used on Amiga computers
The Smart File System (SFS) is a journaling filesystem used on Amiga computers and AmigaOS-derived operating systems (though some support also exists for
Smart_File_System
Encryption system for FreeBSD
GBDE, standing for GEOM Based Disk Encryption, is a block device-layer disk encryption system written for FreeBSD, initially introduced in version 5.0
GBDE
Software feature removing online advertising in a web browser or application
[citation needed] They also contend that the widespread use of ad-blocking software and devices could negatively impact website owners’ revenue. However, newer
Ad_blocking
Flash memory file system
memory-based storage devices (such as solid-state disks, eMMC, and SD cards), which are widely used in computer systems ranging from mobile devices to servers.
F2FS
Component in a digital cinema projection system
the first the Media Block is outside of the projector. This design is simply referred to as a "Media Block" and is typically a device attached directly
Media_Block
Operating system for mobile devices
for smartphones and tablets (touchscreen-based mobile devices originally; later for other devices, such as TVs and PCs), based on a modified version of
Android_(operating_system)
Type of cipher
In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary
Block_cipher
Electronic non-volatile computer storage device
may be erased, written, and read in blocks (or pages), which generally are much smaller than the entire device. NOR flash memory allows a single machine
Flash_memory
Component of the Linux kernel's device mapper
kernel's device mapper, which is a framework for mapping block devices onto higher-level virtual block devices. It allows one or more fast storage devices, such
Dm-cache
File system for the Linux kernel
restrictions in the block driver mean that ext2 filesystems have a maximum file size of 2 TiB. ext2 is still recommended over journaling file systems on bootable
Ext2
Standard for computer data connections
give higher-level access to a device's filesystem than USB mass storage, at the level of files rather than disk blocks. It also has optional DRM features
USB
Electronic component that exploits the electronic properties of semiconductor materials
A semiconductor device is an electronic component that relies on the electronic properties of a semiconductor material (primarily silicon, germanium, and
Semiconductor_device
Ancient Greek analogue astronomical computer
unearthed in the Kerameikos. The device operated on a primitive form of mechanical logic: the central bolt was physically blocked from retracting until the notches
Antikythera_mechanism
Phenomenon associated with solid state storage
idle time to consolidate blocks of flash memory before the host needs to write new data. This enables the performance of the device to remain high. The background
Write_amplification
Digital imaging circuit
capacitors being the basic building blocks of a CCD, and a depleted MOS structure used as the photodetector in early CCD devices. In the late 1960s, Willard Boyle
Charge-coupled_device
American tax preparation company
H&R Block, Inc., or H&R Block, is an American tax preparation company operating in Canada, the United States, and Australia. The company was founded in
H&R_Block
Data on Block-Oriented Storage Devices. April 18, 2008. pp. 1–40. doi:10.1109/IEEESTD.2008.4493450. ISBN 978-0-7381-5363-6. {{cite book}}: |journal= ignored
Disk_encryption_theory
Journaling file system
shared volumes on a file server in a local area network. NSS is a 64-bit journaling file system with a balanced tree algorithm for the directory structure
Novell_Storage_Services
Pulsed nuclear reactor radiation source
The Lady Godiva device was an unshielded pulsed nuclear reactor originally situated at the Los Alamos National Laboratory (LANL), near Santa Fe, New Mexico
Godiva_device
Disk encryption software
and documented manner. LUKS is used to encrypt a block device. The contents of the encrypted device are arbitrary, and therefore any filesystem can be
Linux_Unified_Key_Setup
Medical device
bronchial blocker (also called endobronchial blocker) is a device which can be inserted down a tracheal tube after tracheal intubation so as to block off the
Bronchial_blocker
Internet censorship based upon geographical location
Geo-blocking, geoblocking or geolocking is technology that restricts access to Internet content based upon the user's geographical location. In a geo-blocking
Geo-blocking
Medical device for artificially stimulating heart contractions
also known as an artificial cardiac pacemaker, is an implanted medical device that generates electrical pulses delivered by electrodes to one or more
Pacemaker
Data item stored in a browser by a website
cookie) is a small block of data created by a web server while a user is browsing a website and placed on the user's computer or other device by the user's
HTTP_cookie
Computer memory used for small quantities of data
microcontrollers such as smart cards and remote keyless systems, or as a separate chip device, to store relatively small amounts of data by allowing individual bytes
EEPROM
Mechanical, hydraulic, or pneumatic, lifting device
A jack is a mechanical lifting device. Most often, the term "jack" denotes equipment used to apply great forces or lift heavy loads. There are also smaller
Jack_(device)
Computer systems programming special block code
interrupt instructions, or software exceptions, and are used for implementing device drivers or transitions between protected modes of operation, such as system
Interrupt_handler
Animal pest killer
The M44 cyanide device (also called a cyanide gun, cyanide trap, or canid pest ejector) is used to kill coyotes, feral dogs, and foxes. It is made from
M44_(cyanide_device)
Internet-like structure connecting everyday physical objects
software, and other technologies that connect and exchange data with other devices and systems over the Internet or other communication networks. The field
Internet_of_things
Data structure storing a computer process's information
A process control block (PCB), also sometimes called a process descriptor, is a data structure used by a computer operating system to store all the information
Process_control_block
Computer data storage partitioning standard
partitions and 64-bit rather than 32-bit logical block addresses (LBA) for blocks on a storage device. The larger LBA size supports larger disks. Some
GUID_Partition_Table
Augmenting speech device
Speech-generating devices (SGDs), also known as voice output communication aids, are electronic augmentative and alternative communication (AAC) systems
Speech-generating_device
Integrated circuit device
(FPAA) is an integrated circuit device containing computational analog blocks (CABs) and interconnects between these blocks offering field-programmability
Field-programmable analog array
Field-programmable_analog_array
The antennas contained in mobile phones, and various other electronic devices, emit radiation which consists of non-ionising radiation or radiofrequency
Wireless device radiation and health
Wireless_device_radiation_and_health
Device used to control water levels
Flow devices (also known as beaver deceivers) are human-made solutions to beaver-related flooding problems. Flow devices are relatively cost-effective
Flow_device
Type of removable orthodontic device
A twin block appliance is a type of removable orthodontic device used to correct Class II malocclusion, where the lower jaw is positioned too far back
Twin_block_appliance
Series of V8 engines built by Chrysler
large, wide cylinder head and complex rocker arm geometry in both cam-in-block and single overhead cam engines (dual overhead cam engines may not have
Chrysler_Hemi_engine
Unique identifier assigned to network interfaces
colons, or without a separator. MAC addresses are primarily assigned by device manufacturers, and are therefore often referred to as the burned-in address
MAC_address
On-demand cloud computing provider
2022, AWS announced they had launched the AWS Snowcone, a small computing device, to the International Space Station on the Axiom Mission 1. In September
Amazon_Web_Services
Software used to access websites
also display content stored locally on the user's device. Browsers are used on a range of devices, including desktops, laptops, tablets, smartphones
Web_browser
Type of electronic circuit
a direct current (DC) source. Oscillators are found in many electronic devices, such as radio receivers, television sets, radio and television broadcast
Electronic_oscillator
Device that counters vibration using the effects of inertia
An inertia damper is a device that counters vibration using the effects of inertia and other forces and motion. The damper does not negate the forces but
Inertia_damper
IBM computer family (1964–1977)
and Model 195, the 2880 block multiplexer channel, and then made them standard on the System/370. This channel allowed a device to suspend a channel program
IBM_System/360
Service layer in IEEE 802 network standards
same device package, historically any MAC could be used with any PHY, independent of the transmission medium. When sending data to another device on the
Medium_access_control
Early printing technique using carved wooden blocks
Timothy Hugh Barrett postulates that Gong's magical jade block was actually a printing device, and Gong was one of the first, if not the first printer
Woodblock_printing
Windows Bitmap image file format family
digital images, independently of the display device (such as a graphics adapter). The underlying device-independent bitmap representation is commonly
BMP_file_format
System for producing precision lengths by stacking components
gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge blocks come in sets of blocks with a
Gauge_block
First commercially available robotic vacuum cleaner
released in 2001, becoming the first commercially available robot vacuum. The device takes its name from the extinct arthropod, which scoured the ocean's floor
Electrolux_Trilobite
(Unicode block) Elbasan (Unicode block) Todhri (Unicode block) Vithkuqi (Unicode block) Carian (Unicode block) Lycian (Unicode block) Lydian (Unicode block) Linear
List_of_Unicode_characters
Computer filing system
including Veritas Software Corp. (journaling) VxFS, Sun Microsystems (clustering) QFS, Sun Microsystems (journaling) UFS, and Sun Microsystems (open source
File_system
Copy-on-write file system
more block storage devices (such as hard drives and SD cards), including their organization into logical block devices as VDEVs (ZFS Virtual Device) as
ZFS
Treatment for heart failure
the function of the left and right ventricles via a pacemaker, a small device inserted into the anterior chest wall. CRT is indicated in patients with
Cardiac resynchronization therapy
Cardiac_resynchronization_therapy
Artillery fortifications built to defend the southern coast of England by Henry VIII
The Device Forts, also known as Henrician castles and blockhouses, were a series of artillery fortifications built to defend the coast of England and Wales
Device_Forts
Medical intervention
elicited. Modern portable ultrasound devices allow the user to visualize internal anatomy, including the nerves to be blocked, neighboring anatomic structures
Brachial_plexus_block
Type of two-dimensional barcode
square grid featuring fiducial markers on the corners, readable by imaging devices like cameras, and processed using Reed–Solomon error correction until the
QR_code
Pointing device used to control a computer
A computer mouse (plural mice; rarely mouses) is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is
Computer_mouse
Branch of physics and electrical engineering
circuits using premanufactured building blocks such as power supplies, semiconductors (i.e., semiconductor devices, such as transistors), and integrated
Electronics
US Navy fast attack submarine class
37 to about 65—an increase of about 76%. Decoys: Acoustic Device Countermeasure Mk 3/4 Block I includes 4 boats and modular construction techniques were
Virginia-class_submarine
Scientific journal on biofabrication
engineering, disease and drug-screening models, and biointegrated devices. The journal is abstracted and indexed in: Science Citation Index Biotechnology
Biofabrication_(journal)
Determining the physical location of internet user
geographic position of a device connected to the Internet. The general term internet geolocation refers to the process of localizing a device connected to the
Internet_geolocation
Copy-on-write file system
growth and shrinking Online block device addition and removal Online balancing (movement of objects between block devices to balance load) Offline file-system
Btrfs
Extrication brace for motor vehicle accidents
patient is blocking access to another victim. Brown, Nick (2015). "Should the Kendrick Extrication Device have a place in pre-hospital care?". Journal of Paramedic
Kendrick_extrication_device
IEEE standard for wireless networks
Wi-Fi Alliance introduced its Wi-Fi Certified 7 program to certify Wi-Fi 7 devices, as the technical requirements were essentially complete. The following
Wi-Fi_7
Fraudulent alternative medicine device
containing marketing documents and usage instructions. The USB device is housed in a clear perspex block imprinted with a stylized version of St George slaying
5GBioShield
Cold War coalition of communist states
part because periodic shortages of birth control pills and intrauterine devices made these systems unreliable, also depressed the birth rate and forced
Eastern_Bloc
Medium to store keys for signing cryptocurrency transactions
A cryptocurrency wallet is a device, physical medium, program or an online service which stores the public and/or private keys for cryptocurrency transactions
Cryptocurrency_wallet
Focusing the eyes on a display device for a protracted period of time
resulting from focusing the eyes on a computer, smartphone or other display device for protracted, uninterrupted periods of time and the eye's muscles being
Computer_vision_syndrome
Cache in the Linux kernel's block layer
(abbreviated from block cache) is a cache mechanism in the Linux kernel's block layer, which is used for accessing secondary storage devices. It allows one
Bcache
Water-filled casing surrounding a device for temperature control
A water jacket is a water-filled casing surrounding a device, typically a metal sheath having intake and outlet vents to allow water to be pumped through
Water_jacket
Conduction abnormality in the heart
Bifascicular block is characterized by right bundle branch block with left anterior fascicular block, or right bundle branch block with left posterior
Bifascicular_block
Short-range wireless technology standard
moves with the device. Bluetooth implements confidentiality, authentication and key derivation with custom algorithms based on the SAFER+ block cipher. Bluetooth
Bluetooth
2023 mobile operating system
any point a device not registered with the key sends a message, the other user will be notified. Journal is an end-to-end–encrypted journaling app that lets
IOS_17
travel, tourism, insurance
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travel, tourism, insurance