| dbo:abstract |
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 emulated on IBM mainframes. It is a self-defining format with each data record represented by a Count Area that identifies the record and provides the number of bytes in an optional Key Area and an optional Data Area. This is in contrast to devices using fixed sector size or a separate format track. Count key data (CKD) also refers to the set of channel commands (collectively Channel Command Words, CCWs) that are generated by an IBM mainframe for execution by a DASD subsystem employing the CKD recording format. The initial set of CKD CCWs, introduced in 1964, was substantially enhanced and improved into the 1990s. (en) |
| dbo:thumbnail |
wiki-commons:Special:FilePath/CKD_Track_Format.png?width=300 |
| dbo:wikiPageExternalLink |
http://www.bitsavers.org/pdf/ibm/dasd/GC20-1649-9_DASDintro_Dec75.pdf http://www.leeandmelindavarian.com/Melinda/gribbin.pdf https://archive.org/details/bitsavers_ibm360refeystem360ReferenceData_662124 |
| dbo:wikiPageID |
8895690 (xsd:integer) |
| dbo:wikiPageLength |
33786 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID |
1122124500 (xsd:integer) |
| dbo:wikiPageWikiLink |
dbr:Cache_(computing) dbr:Z/OS dbc:IBM_storage_devices dbr:Data_set_(IBM_mainframe) dbr:Direct-access_storage_device dbr:Record_(computer_science) dbr:History_of_IBM_CKD_Controllers dbc:File_system_management dbc:IBM_mainframe_operating_systems dbr:Block_(data_storage) dbr:Track_(disk_drive) dbr:IBM dbr:IBM_System/360 dbr:IBM_System/360_architecture dbr:Channel_I/O dbr:Direct_Access_Storage_Device dbr:IBM_2302 dbr:IBM_2311 dbr:IBM_2321_Data_Cell dbr:Fixed-block_architecture dbr:Volume_Table_of_Contents dbr:File:CKD_Track_Format.png dbr:File:IBM_CKD_Arch.png |
| dbp:colwidth |
40 (xsd:integer) |
| dbp:wikiPageUsesTemplate |
dbt:Anchor dbt:Cite_book dbt:Distinguish dbt:Efn dbt:Mvar dbt:Notelist dbt:Page_needed dbt:Reflist dbt:Rp dbt:See_also dbt:Short_description dbt:Snd |
| dct:subject |
dbc:IBM_storage_devices dbc:File_system_management dbc:IBM_mainframe_operating_systems |
| gold:hypernym |
dbr:Format |
| rdf:type |
owl:Thing dbo:Software yago:Artifact100021939 yago:Device103183080 yago:Instrumentality103575240 yago:MemoryDevice103744840 yago:Object100002684 yago:PhysicalEntity100001930 yago:WikicatIBMStorageDevices yago:Whole100003553 |
| rdfs:comment |
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 emulated on IBM mainframes. It is a self-defining format with each data record represented by a Count Area that identifies the record and provides the number of bytes in an optional Key Area and an optional Data Area. This is in contrast to devices using fixed sector size or a separate format track. (en) |
| rdfs:label |
Count key data (en) |
| rdfs:seeAlso |
dbr:History_of_IBM_CKD_Controllers dbr:O dbr:Channel_I |
| owl:differentFrom |
dbr:Count_data |
| owl:sameAs |
freebase:Count key data yago-res:Count key data wikidata:Count key data http://hi.dbpedia.org/resource/गणना_कुंजी_डेटा https://global.dbpedia.org/id/4iS35 |
| prov:wasDerivedFrom |
wikipedia-en:Count_key_data?oldid=1122124500&ns=0 |
| foaf:depiction |
wiki-commons:Special:FilePath/CKD_Track_Format.png wiki-commons:Special:FilePath/IBM_CKD_Arch.png |
| foaf:isPrimaryTopicOf |
wikipedia-en:Count_key_data |
| is dbo:wikiPageDisambiguates of |
dbr:Count_(disambiguation) |
| is dbo:wikiPageRedirects of |
dbr:Extended_Count_Key_Data dbr:Extended_count_key_data dbr:Count-key-data dbr:Count_Key_Data dbr:ECKD dbr:Count-Key-Data dbr:CKD_disk |
| is dbo:wikiPageWikiLink of |
dbr:Extended_Count_Key_Data dbr:Extended_count_key_data dbr:DBOMP dbr:Magnetic-tape_data_storage dbr:Track_(moving_medium) dbr:Disk_sector dbr:Disk_storage dbr:Count-key-data dbr:Count_(disambiguation) dbr:Count_Key_Data dbr:History_of_IBM_magnetic_disk_drives dbr:ECKD dbr:IBM_System/360_architecture dbr:Channel_I/O dbr:Extent_(file_systems) dbr:FICON dbr:IBM_Administrative_Terminal_System dbr:IBM_drum_storage dbr:Fixed-block_architecture dbr:Count-Key-Data dbr:CKD_disk |
| is rdfs:seeAlso of |
dbr:History_of_IBM_magnetic_disk_drives |
| is owl:differentFrom of |
dbr:Count_data |
| is foaf:primaryTopic of |
wikipedia-en:Count_key_data |
