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Discriminative model
A discriminative model is a machine learning model that learns a direct mapping from input features to output labels, the conditional probability p(y|x), with examples like logistic regression, support vector machines, and neural network classifiers.
Disengagement reporting
Disengagement reporting is a California DMV rule requiring manufacturers testing autonomous vehicles on public roads to report test miles and every takeover, from 2014 to 2026.
Disentangled representation learning
Disentangled representation learning trains generative or self-supervised models so each latent variable responds to a single underlying factor of variation, a goal popularized by Bengio, Courville, and Vincent in 2013.
Dish Network
Dish Network, formally DISH Network Corporation, is an American satellite television service that began operating in 1996 as a rival to DirecTV and is now part of EchoStar.
Dish TV
Dish TV, also known as Dish TV India, is a direct-to-home satellite television service in India, launched in 2003 as the country's first DTH platform.
Disinfectant
A disinfectant, or disinfecting agent, is a substance that destroys or irreversibly inactivates bacteria, fungi, and viruses on inanimate surfaces, though not always bacterial spores.
Disinfection by-products
Disinfection by-products (DBPs) are contaminants formed when disinfectants such as chlorine react with organic matter in drinking water; the US EPA limits trihalomethanes and haloacetic acids.
Disjoint-set data structure
The disjoint-set data structure, also called union-find, maintains a partition of elements into disjoint subsets; with union by rank and path compression, each operation runs in effectively constant amortized time.
Disk Cleanup
Disk Cleanup is a built-in Microsoft Windows utility, launched as Cleanmgr.exe, that frees hard drive space by deleting temporary files, Recycle Bin contents, and superseded Windows Update components.
Disk cloning
Disk cloning, also known as disk ghosting, is the process of making a complete block-level copy of a disk drive or partition for use in place of the original.
Disk encryption theory
As a branch of cryptography, Disk encryption theory studies encryptable storage sectors under the constraint that ciphertext must match plaintext size, shaping FDE modes and security definitions.
Disk formatting
Disk formatting, also called disk format, is the process of preparing a storage device or partition for use by creating a file system, erasing existing data.
Disk image
A disk image is a byte-by-byte copy of a storage device, such as a hard drive or optical disc, stored as one file for recovery or cloning.
Disk operating system
A disk operating system (DOS) is an operating system that loads from and manages files on magnetic disks, best known through Microsoft's MS-DOS and IBM's PC-DOS.
Disk partitioning
Disk partitioning is the division of a hard drive or SSD into one or more logical disks called partitions, recorded in a partition table, using MBR or GPT formats.
Disk read-and-write head
The disk read-and-write head, also called the read-write head, is the electromagnetic component of a hard disk drive that writes and reads data on spinning platters.
Disk resonator gyroscope
A disk resonator gyroscope (DRG) is a MEMS Coriolis vibratory gyroscope in which a vibrating flat disk or set of concentric rings senses rotation, first developed by Boeing.
Disk sector
A disk sector is the smallest addressable unit of storage on a disk drive, historically 512 bytes and now typically 4,096 bytes under the Advanced Format standard.
Disk storage
Disk storage stores data on rotating magnetic disks, a technology introduced by IBM's RAMAC drive in 1956 that remains the basis of the hard disk drive, alongside solid-state successors.
Disk Utility
Disk Utility, also known as Apple Disk Utility, is a macOS application for formatting, partitioning, repairing, and encrypting storage devices, bundled since 2000 and available from macOS Recovery.
DiskANN
DiskANN is a family of disk-based approximate nearest-neighbor search algorithms developed at Microsoft Research, able to index and search a billion vectors on a single workstation.
Dismal Swamp Canal
The Dismal Swamp Canal is a 22-mile artificial waterway from Deep Creek, Virginia, to South Mills, North Carolina, dug largely by enslaved labor, opened in 1805, and still operating today.
Disney and Universal v. Midjourney
Disney and Universal v. Midjourney is a 2025 copyright lawsuit by Disney and Universal Studios against AI image generator Midjourney, the first by major Hollywood studios.
Disney cease-and-desist against Google over AI training
The Disney cease-and-desist against Google was a December 2025 legal notice alleging Google trained AI models like Gemini and Veo on Disney works without authorization, prompting removal of 66 YouTube videos.
Disney Cruise Line
Disney Cruise Line is The Walt Disney Company's cruise business, operated through Magical Cruise Company Limited, which debuted its first ship in 1998 and is expanding to 13 family-oriented ships by 2031.
Disney Destiny
Disney Destiny is a cruise ship operated by Disney Cruise Line, the third Wish-class ship, themed around Disney, Pixar, and Marvel heroes and villains, entering service in November 2025.
Disney Dream
The Disney Dream is a cruise ship operated by Disney Cruise Line, built by Meyer Werft and delivered in 2010; it entered service in 2011 from Port Canaveral, Florida.
Disney Fantasy
Disney Fantasy is a cruise ship operated by Disney Cruise Line, the fourth ship in the fleet and second Dream-class vessel, delivered by Meyer Werft in 2012.
Disney Magic
Disney Magic is a cruise ship operated by Disney Cruise Line and the first vessel in its fleet, built by the Italian shipyard Fincantieri and placed in service in 1998.
Disney Networks Group Asia Pacific
Disney Networks Group Asia Pacific, formerly Fox Networks Group Asia Pacific, is a Hong Kong-registered Disney subsidiary that has operated pay-TV channels across Asia since 1991.