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Direct access storage device data recording format
Count key data (CKD) is a direct-access storage device (DASD) data recording format introduced in 1964, by IBM with its IBM System/360 and still being
Count_key_data
Sorting algorithm
In computer science, counting sort is an algorithm for sorting a collection of objects according to keys that are small positive integers; that is, it
Counting_sort
Storage area in computer file system
file system, represented as a range of block numbers, or tracks on count key data devices. A file can consist of zero or more extents; one file fragment
Extent_(file_systems)
control unit. Disk packs are written in these attachments in IBM's count key data variable record length format. The 2311 models 11 or 12 are used when
History of IBM magnetic disk drives
History_of_IBM_magnetic_disk_drives
Data storage technologies that use magnetic tape
constant, while the size of the data block was based on host block size, affecting tape capacity – for example, on count key data storage. On most modern drives
Magnetic-tape_data_storage
IBM term for a type of hard disk drive
"512e" stands for "512-byte emulation". Block (data storage) Data set (IBM mainframe) Count key data (CKD) Record (computer science) Track (disk drive)
Fixed-block_architecture
Process of preparing a data storage device for initial use
System/360 expanded this concept in the form of Count Key Data (CKD) and later Extended Count Key Data (ECKD); however the use of variable block size in
Disk_formatting
Topics referred to by the same term
Count data, a statistical data type Count key data, a data recording format Count Dracula (disambiguation) Count Me In (disambiguation) Count Me Out
Count_(disambiguation)
Logical or physical division of storage media
a Count field, which acts as an ID field, an optional Key field to aid in searching for data, and a Data field; in practice, most records had no Key field
Disk_sector
Path on a recording medium
for CRAM). The IBM 2321 Data Cell used magnetic strips in a cell and a subcell. The tracks had variable-length count key data (CKD) records. Magnetic
Track_(moving_medium)
Function that derives secret keys from a secret value
randomly) and a high iteration count. NIST recommends a minimum iteration count of 10,000. "For especially critical keys, or for very powerful systems
Key_derivation_function
Secondary storage device
such as BSAM, require the user program to do it. CKD is an acronym for Count Key Data, the physical layout of a block on a DASD device, and should not be
Direct-access_storage_device
Discrete, discontinuous representation of information
of data, there is always a key component present. Keys in data and data-structures are essential for giving meaning to data values. Without a key that
Digital_data
its 1964 System/360 announcement, IBM's mainframes initially accessed count key data (CKD) subsystems via a channel connected to separate Storage Control
History of IBM CKD Controllers
History_of_IBM_CKD_Controllers
Parallel programming model
worker nodes redistribute data based on the output keys (produced by the map function), such that all data belonging to one key is located on the same worker
MapReduce
Measurement that evaluates the success of an organization
A performance indicator or key performance indicator (KPI) is a type of performance measurement used to evaluate the success of an organization, activity
Performance_indicator
Data structure for approximate set membership
space as counting Bloom filters. The scalability issue does not occur in this data structure. Once the designed capacity is exceeded, the keys could be
Bloom_filter
OS/360 Release 21.7 in 1973, prior to changes for Y2K. Data Control Block (DCB) Count Key Data (CKD) Master Boot Record (MBR on PCs) The VTOC for an IBM
Volume_Table_of_Contents
Facility used to house computer servers
May 26, 2016. "Equinix Expands Miami Data Center Key to Latin American Connectivity". "Hyperscale Data Center Count Hits 1,136; Average Size Increases;
Data_center
Extremely large or complex datasets
data was originally associated with three key concepts: volume, variety, and velocity. The analysis of big data that have only volume, velocity, and variety
Big_data
Historical method for giving addresses to physical data blocks on hard disk drives
first half of the drive. Cylinder Head Record format has been used by Count Key Data (CKD) hard disks on IBM mainframes since at least the 1960s. This is
Cylinder-head-sector
Topics referred to by the same term
Republic Complete knock down, a complete kit needed to assemble a product Count Key Data, a disk architecture used in IBM mainframe computers Crooked Creek Airport
CKD
Data storage device
A USB flash drive (also known as a thumb drive) is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive
USB_flash_drive
Two-dimensional matrix barcode
symbol while the timing pattern provides a count of the number of rows and columns in the symbol. As more data is encoded in the symbol, the number of cells
Data_Matrix
Binary file format for storing machine-learning models
sequential sections: a fixed-size header, a key–value metadata block, a tensor information block, and the tensor data itself. Prior to version 3, files were
GGUF
Data analysis is the process of inspecting, cleansing, transforming, and modeling data with the goal of discovering useful information, informing conclusions
Data_analysis
Computer access method
of addressing can only be used with fixed length blocks (RECFM=F). Count Key Data IBM System/360 Operating System Basic Direct Access Method Program Logic
Basic_direct_access_method
Type of two-dimensional barcode
4 Data encoding; Table 3 – Number of bits in character count indicator for QR code 2005 Information technology – Automatic identification and data capture
QR_code
Probabilistic data structure
A counting Bloom filter (CBF) or spectral Bloom filter is a probabilistic data structure that is used to test whether the number of occurrences of a given
Counting_Bloom_filter
Mapping arbitrary data to fixed-size values
conjunction with hash tables to store and retrieve data items or data records. The hash function translates the key associated with each datum or record into a
Hash_function
Visual representation of data
the key messages in the report. Useful criteria for a data or information visualization include: It is based on (non-visual) data - that is, a data/info
Data and information visualization
Data_and_information_visualization
Data-storage devices
systems as a count key data device, and was discontinued in 1965. The 7320 is a vertically mounted head-per-track device with 449 tracks, 400 data tracks,
IBM_drum_storage
Organized collection of data in computing
linked data set which was formed into a large network. Applications could find records by one of three methods: Use of a primary key (known as a CALC key, typically
Database
Data analysis technique
view of all data, for uses such as master data management, where key data is needed, or data governance for improving data quality. Data profiling refers
Data_profiling
Monitoring system in computer drives
Fail Count (chip)". March 9, 2010. Over-Provisioning Benefits for Samsung Data Center SSDs (PDF) (Report). Samsung. March 2019. "SSDs and SMART Data | Crucial
Self-Monitoring, Analysis and Reporting Technology
Self-Monitoring,_Analysis_and_Reporting_Technology
Process of analyzing large data sets
Spying? Don't Count on It". Washington Spectator. Archived from the original on 2007-11-28. Taipale, Kim A. (15 December 2003). "Data Mining and Domestic
Data_mining
Data serialization format
CBOR encoded data is seen as a stream of data items. Each data item consists of a header byte containing a 3-bit type and 5-bit short count. This is followed
CBOR
Techniques to protect against brute-force attack
key to encrypt static data. These examples assume that a consumer CPU can do about 65,000 SHA-1 hashes in one second. Thus, a program that uses key stretching
Key_stretching
Information that identifies a person
broader data protection regimes such as the GDPR, personal data is defined in a non-prescriptive principles-based way. Information that might not count as
Personal_data
Correcting inaccurate computer records
parts of the data and then replacing, modifying, or deleting the affected data. Data cleansing can be performed interactively using data wrangling tools
Data_cleansing
Class templates in the C++ programming language
demonstrates how to use the map<string, int> to count occurrences of words. It uses the word as the key and the count as the value. import std; using std::cin;
Associative_containers_(C++)
American singer and songwriter (born 1981)
September 2020, Keys launched her lifestyle brand Keys Soulcare. Keys and Brandi performed "A Beautiful Noise" on Every Vote Counts: A Celebration of
Alicia_Keys
American tennis player (born 1995)
officially count as a win. "Boca Raton's Madison Keys, Plantation's Sloane Stephens to meet in French Open semis Boca Raton's Madison Keys, Plantation's
Madison_Keys
Data-interchange format
purposes. Data can be encoded in XML in several ways. The most expansive form using tag pairs results in a much larger (in character count) representation
JSON
Randomized algorithm
key Insert(Key, Item) -> Adds item with specified key *) ReservoirSampleWithJumps(S[1..?]) H := new min-priority-queue while S has data and H.Count <
Reservoir_sampling
Mathematical tool
traversal counts, one can then search for the most significant path(s). There are several ways of finding them, including local, global, and key-route search
Main_path_analysis
British nurse convicted of murder (born 1990)
began working there. Charged in November 2020 with seven counts of murder and fifteen counts of attempted murder relating to seventeen babies, Letby was
Lucy_Letby
Random search tree data structure
forms of binary search tree data structures that maintain a dynamic set of ordered keys and allow binary searches among the keys. After any sequence of insertions
Treap
Data organization and storage formats
Ternary heap D-ary heap Brodal queue In these data structures each tree node compares a bit slice of key values. Radix tree Suffix tree Suffix array Compressed
List_of_data_structures
Cryptographic key management scheme
Therefore, if a derived key is compromised, future and past transaction data are still protected since the next or prior keys cannot be determined easily
Derived unique key per transaction
Derived_unique_key_per_transaction
Type of challenge–response authentication
i=iteration‑count,[extensions,]c=base64(channel‑flag,[a=authzid],channel‑binding),r=c‑nonce‖s‑nonce[,extensions] The proofs are calculated as follows: ClientKey =
Salted Challenge Response Authentication Mechanism
Salted_Challenge_Response_Authentication_Mechanism
Census Bureau’s decennial population counts. Notes: 1 The FBI does not publish arson data unless it receives data from either the agency or the state for
List of United States cities by crime rate
List_of_United_States_cities_by_crime_rate
Cryptographic protocols for securing data in transit
generate a unique session key for subsequent encryption and decryption of data during the session, or uses Diffie–Hellman key exchange (or its variant
Transport_Layer_Security
Time limit of messages in network engineering
data in a computer or network. TTL may be implemented as a counter or timestamp attached to or embedded in the data. Once the prescribed event count or
Time_to_live
Data input device
definitive ancestor of all key-based text entry devices, but the computer keyboard as a device for electromechanical data entry and communication largely
Computer_keyboard
File format
NSKeyedArchiver. Since there is not a UID data type in XML, the integers are stored in a dictionary under the key "CF$UID". Apple publishes an open-source
Property_list
24th US national census
household, and to count and provide characteristics for the people in the household after multiple attempts using existing high-quality data from trusted sources
2020_United_States_census
Set count to 0 // Unique sequence While count ≤ 0x7F and index < count of data If index + 2 < count of data and data[index] = data[index+1] and data[index]
Apple_Icon_Image_format
Source available in-memory key–value database
is an in-memory key–value database, used as a distributed cache and message broker, with optional durability. Because it holds all data in memory and because
Redis
U.S. election prediction system
work here. Do we count Obama's stimulus but not Hoover's?" Statistician Nate Silver has also criticised the subjectivity of certain keys, particularly candidate
The_Keys_to_the_White_House
Software class or data structure whose instances are collections of other objects
templates. Container abstract data types include: FIFO queues LIFO stacks Priority queues Lookup tables (LUTs) Key-associated data structures Sets, containing
Container (abstract data type)
Container_(abstract_data_type)
Number of transistors in a device
The transistor count is the number of transistors in an electronic device (typically on a single substrate or silicon die). It is the most common measure
Transistor_count
System that can issue, distribute and verify digital certificates
A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures used to create, manage, distribute, use, store and revoke
Public_key_infrastructure
Type of data structure
Some array data structures do not reallocate storage, but do store a count of the number of elements of the array in use, called the count or size. This
Array_(data_structure)
Statistical concept
statistics, missing data, or missing values, occur when no data value is stored for the variable in an observation. Missing data are a common occurrence
Missing_data
Algorithm for encrypting and decrypting information
criteria: by type of key used, and by type of input data. By type of key used ciphers are divided into: symmetric key algorithms (Private-key cryptography),
Cipher
SQL statement that returns a result set of rows from one or more tables
the {unique_key} is greater than {last_val} (the value of the {unique_key} of the last row in the current page) Previous Page: sort the data in the reverse
Select_(SQL)
Practice of completely wiping data from a storage medium
Data sanitization involves the secure and permanent erasure of sensitive data from datasets and media to guarantee that no residual data can be recovered
Data_sanitization
Study of collection and analysis of data
collection, organization, analysis, interpretation, and presentation of data. In applying statistics to a scientific, industrial, or social problem, it
Statistics
Number of nonzero symbols in a string
2005. In the C++ Standard Library, the bit-array data structure bitset has a count() method that counts the number of bits that are set. In C++20, a new
Hamming_weight
Attack against cryptographical hash functions
could be implemented to handle requests of the given format: Original Data: count=10&lat=37.351&user_id=1&long=-119.827&waffle=eggo Original Signature:
Length_extension_attack
Tracking system for music and music video sales
published Billboard 200 and Country Album charts based on SoundScan "piece count data", and the first Hot 100 chart to debut with the system was released on
Luminate_(company)
American charitable foundation
in the United States. The AECF publishes annual data on child well-being through its Kids Count Data Book. The AECF was started in 1948 in Seattle by
Annie_E._Casey_Foundation
Cryptography secured against quantum computers
as data recorded now may still remain sensitive many years into the future. In contrast to the threat quantum computing poses to current public-key algorithms
Post-quantum_cryptography
Data combined from several measurements
aggregate data is going to replace the NHS 111 minimum dataset. It will also be used as a formal source for IUC statistics, as well as to oversee the Key Performance
Aggregate_data
Entity that issues digital certificates
card data also the Card Issuer Certificate to the POS. The Issuer Certificate is signed by EMV CA Certificate. The POS retrieves the public key of EMV
Certificate_authority
Type of data structure
to create a data type supporting both increment and decrement operations. The "P" G-Counter counts increments; and the "N" G-Counter counts decrements
Conflict-free replicated data type
Conflict-free_replicated_data_type
Inventory auditing procedure
against counting higher value inventory or require additional counting to satisfy accounting requirements. This method conducts inventory checks at key points
Cycle_count
Arrangement of keys on a typographic keyboard
caret), function keys and system keys for special actions (such as Esc and Break), and a numeric keypad to facilitate calculations or data entry. Different
Keyboard_layout
contain only a portion of the key plus some additional meta-data bits. These bits are used to deal with the case when distinct keys happen to hash to the same
Quotient_filter
Internet routing security framework
ends of the AS path and counts the number of adjacencies that are valid customer-provider relationships according to the ASPA data. The longest valid path
Resource Public Key Infrastructure
Resource_Public_Key_Infrastructure
File format for genomic variation data
optional column is used to describe the format of the data in the columns that follow. Arbitrary keys are permitted, although the following sub-fields are
Variant_Call_Format
Abstract data type for storing distinct values
items in the data structure; while others will collapse it down to one version (the first one encountered) and keep a positive integer count of the multiplicity
Set_(abstract_data_type)
Data collected not by the primary user
It is a regularly occurring and official count of a particular population. It is a type of administrative data, but it is collected for the purpose of
Secondary_data
Task of finding records in a data set that refer to same entity across different sources
key, URI, National identification number), which may be due to differences in record shape, storage location, or curator style or preference. A data set
Record_linkage
Important algorithms in numerical statistics
"shifted data" algorithm: class WelfordVariance: def __init__(self): # Comparison to ShiftDataVariance: self.mean = 0.0 # = K + Ex / n self.count = 0 # =
Algorithms for calculating variance
Algorithms_for_calculating_variance
Process of counting votes in an election
Vote counting is the process of counting votes in an election. It can be done manually or by machines. In the United States, the compilation of election
Vote_counting
Free application for event monitoring and alerting
each optionally qualified by an arbitrary number of key-value label pairs. Labels can identify the data source (server name, datacenter) or carry application-specific
Prometheus_(software)
16th Indian census
counting every single caste in India. On 6 June 2022 the Bihar government issued a notification to conduct a caste survey, and began collecting data on
2027_census_of_India
Algorithm that arranges lists in order
formally, the data being sorted can be represented as a record or tuple of values, and the part of the data that is used for sorting is called the key. In the
Sorting_algorithm
Census-Designated Place in Virginia, United States
metropolitan area. Ashburn is a major hub for Internet traffic due to its many data centers. The name Ashburn is believed to have originated from "Ashburn Farm
Ashburn,_Virginia
Data structure for storing strings
are usually implemented as basic fixed-length strings with a reference count attached for deallocation when no longer needed, although other garbage
Rope_(data_structure)
Storage of digital data readable by computers
drives is estimable using S.M.A.R.T. diagnostic data that includes the hours of operation and the count of spin-ups, though its reliability is disputed
Computer_data_storage
Average uncertainty in variable's states
Shannon entropy. Shannon's theory defines a data communication system composed of three elements: a source of data, a communication channel, and a receiver
Entropy_(information_theory)
Model independent architecture for the S/360 line of mainframe computers
Store Key, Display Key and, on some models, the Set IC Key.. The Data Switches specify the data for the Store Key and, on some models, the Set IC Key. The
IBM_System/360_architecture
Standard for serial communication between devices without host computer
Retrieved 21 December 2025. "NISMO Increases GT6 GPS Data Logger Functionality and Track Count". www.gtplanet.net. 25 October 2014. "What is DiveCAN
CAN_bus
Telecommunication network interface
branch exchange (PBX) and other key telephone systems. The RJ45S, an obsolete standard jack once specified for modem or data interfaces, has a slot on one
Registered_jack
Prime Minister of New Zealand from 2008 to 2016
Count Results–Helensville". Electoral Commission. 12 November 2008. Archived from the original on 21 June 2009. Retrieved 12 November 2008. "John Key
John_Key
Engaging in sexual activities with two or more people
"We're Talking Body Count". The Namibian. Retrieved 2026-02-25. "Many Indian Women Have More Sexual Partners Than Men, Govt Data Shows". www.theswaddle
Multiple_sex_partners
School district in Florida, United States
are headquartered in Key West, Florida, United States, with school sites located throughout the Florida Keys from Key West to Key Largo. The district provides
Monroe County School District (Florida)
Monroe_County_School_District_(Florida)
COUNT KEY-DATA
COUNT KEY-DATA
Boy/Male
Indian, Sanskrit, Tamil
Key; Love
Boy/Male
Muslim
Key
Boy/Male
Bengali, English, Indian, Sindhi
Key
Surname or Lastname
English (county Durham)
English (county Durham) : unexplained.
Surname or Lastname
English (County Durham)
English (County Durham) : variant of Jameson.
Boy/Male
Indian
Key
Surname or Lastname
English and Scottish
English and Scottish : variant of Kay.
Boy/Male
Shakespearean English French
King Henry V' Soldier in the King's army.
Surname or Lastname
English
English : nickname from Middle English ca ‘jackdaw’, from an unattested Old Norse ká. See also Daw.English : nickname from Middle English cai, kay, kei ‘left-handed’, ‘clumsy’.English : metonymic occupational name for a locksmith, from Middle English keye, kaye ‘key’. Compare Care, Kear.English : topographic name for someone living on or near a quay, Middle English kay(e), Old French cay.English : from a Middle English personal name which figures in Arthurian legend. It is found in Old Welsh as Cai, Middle Welsh Kei, and is ultimately from the Latin personal name Gaius.Scottish and Irish : reduced form of McKay.French : variant of Quay, cognate with 2.Much shortened form of any of various names, mostly Eastern European, beginning with the letter K-.Variant of Danish and Frisian Kai.
Surname or Lastname
English (County Durham)
English (County Durham) : unexplained.
Male
Turkish
Turkish name GÖKER means "man of the sky."
Surname or Lastname
English and German
English and German : variant of Kay.Irish : reduced form of McKay.
Surname or Lastname
English and French
English and French : topographic name from Middle English, Old French court(e), curt ‘court’ (Latin cohors, genitive cohortis, ‘yard’, ‘enclosure’). This word was used primarily with reference to the residence of the lord of a manor, and the surname is usually an occupational name for someone employed at a manorial court.English : nickname from Old French, Middle English curt ‘short’, ‘small’ (Latin curtus ‘curtailed’, ‘truncated’, ‘cut short’, ‘broken off’).Irish : reduced form of McCourt.
Surname or Lastname
English
English : unexplained; possibly a respelling of Kay 6, a shortened form of Scottish and Irish McKay.Korean : There is only one Chinese character and one clan for the Kye family name. According to the Kye family genealogy, the clan was founded by a Ming Dynasty government official named Kye SÅk-son who migrated to KoryÅ and settled in today’s Suan County of Hwanghae Province. The majority of bearers of the Kye family name today live in North Korea.
Male
Japanese
(1-å¥, 2-謙, 3-ç ”) Japanese name KEN means 1) "healthy, strong" or 2) "modest," or 3) "study." Compare with another form of Ken.
Surname or Lastname
English
English : topographic name for someone who lived on or near a hill, Middle English mount (from Old English munt, reinforced by Old French mont).Scottish : probably a habitational name from places so called in Peeblesshire, Fife, and Lanarkshire.
Boy/Male
Muslim/Islamic
Key
Boy/Male
Gaelic
Son of Aidan.
Boy/Male
Christian, Gaelic, Indian
The One who Opens the Lock
Male
English
Short form of English Kenneth, KEN means both "born of fire" and "comely; finely made." Also used as a nickname for other names that begin with Ken-. Compare with another form of Ken.
COUNT KEY-DATA
COUNT KEY-DATA
Male
English
Anglicized form of Hebrew Aryeh, ARIEH means "lion." In the bible, this is the name of an officer of king Pekahiah.Â
Boy/Male
Hindu, Indian
Friend
Boy/Male
Greek
Superior; best of thinkers. Famous Bearers: ancient Greek philosopher Aristotle, and Greek...
Girl/Female
Gujarati, Hindu, Indian, Kannada, Marathi, Telugu
Wanderer; Traveller
Female
Yiddish
(זִיסֶע) Yiddish name ZISSE means "sweet."
Boy/Male
Indian
An Ancient
Girl/Female
Latin
Daughter of Triopas.
Girl/Female
Muslim
Worship
Surname or Lastname
English
English : variant spelling of Council.
Boy/Male
Biblical
Pain, force, iniquity.
COUNT KEY-DATA
COUNT KEY-DATA
COUNT KEY-DATA
COUNT KEY-DATA
COUNT KEY-DATA
n.
A position or condition which affords entrance, control, pr possession, etc.; as, the key of a line of defense; the key of a country; the key of a political situation. Hence, that which serves to unlock, open, discover, or solve something unknown or difficult; as, the key to a riddle; the key to a problem.
p. pr. & vb. n.
of Key
v. i.
To plead orally; to argue a matter in court; to recite a count.
n.
Any formal assembling of the retinue of a sovereign; as, to hold a court.
n.
An earldom; the domain of a count or earl.
n.
A count; an earl or lord.
v. t.
To fasten or secure firmly; to fasten or tighten with keys or wedges.
p. pr. & vb. n.
of Court-martial
v. t.
To form a key seat, as by cutting. See Key seat, under Key.
n.
That part of an instrument or machine which serves as the means of operating it; as, a telegraph key; the keys of a pianoforte, or of a typewriter.
n.
A family of tones whose regular members are called diatonic tones, and named key tone (or tonic) or one (or eight), mediant or three, dominant or five, subdominant or four, submediant or six, supertonic or two, and subtonic or seven. Chromatic tones are temporary members of a key, under such names as " sharp four," "flat seven," etc. Scales and tunes of every variety are made from the tones of a key.
n.
A key for opening more locks than one; a master key.
n.
A key or scale closely related to another as principal; a relative or attendant key. [R.] See Attendant keys, under Attendant, a.
imp. & p. p.
of Court-martial
n.
See Key way, under Key.
v. i.
To number or be counted; to possess value or carry weight; hence, to increase or add to the strength or influence of some party or interest; as, every vote counts; accidents count for nothing.
v. t.
A formal statement of the plaintiff's case in court; in a more technical and correct sense, a particular allegation or charge in a declaration or indictment, separately setting forth the cause of action or prosecution.
n.
An indehiscent, one-seeded fruit furnished with a wing, as the fruit of the ash and maple; a samara; -- called also key fruit.
a.
Cold as a metallic key; lifeless.
n.
An instrument which is turned like a key in fastening or adjusting any mechanism; as, a watch key; a bed key, etc.