Property talk:P2928

Documentation

• Start a query
• Current uses
• Statistics by class
• Units
• Scale of values
• List of qualifiers
• Count

memory capacity
memory storage capacity of some data storage device

Represents	storage capacity (Q2308599)
Data type	Quantity
Allowed units	yottabyte (Q79752), zettabyte (Q79747), exabyte (Q79745), petabyte (Q79744), terabyte (Q79741), gigabyte (Q79738), megabyte (Q79735), kilobyte (Q79726), byte (Q8799), bit (Q8805), kibibyte (Q79756), mebibyte (Q79758), gibibyte (Q79765), tebibyte (Q79769), pebibyte (Q79774), exbibyte (Q79777), zebibyte (Q79779) or yobibyte (Q79781)
Example	iPhone 8 Plus (Q39598190) → 3 gigabyte Macintosh XL (Q1578699) → 512 kilobyte
Tracking: usage	Category:Pages using Wikidata property P2928 (Q33391310)
Tracking: local yes, WD no	no label (Q101364468)
See also	maximum size or capacity (P3559)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P2928 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 984 Main statement 777 79% of uses Qualifier 207 21% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Units: “yottabyte (Q79752), zettabyte (Q79747), exabyte (Q79745), petabyte (Q79744), terabyte (Q79741), gigabyte (Q79738), megabyte (Q79735), kilobyte (Q79726), byte (Q8799), bit (Q8805), kibibyte (Q79756), mebibyte (Q79758), gibibyte (Q79765), tebibyte (Q79769), pebibyte (Q79774), exbibyte (Q79777), zebibyte (Q79779), yobibyte (Q79781)”: value unit must be one of listed. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Honeywell 316 (Q623187)
List of violations of this constraint: Database reports/Constraint violations/P2928#Units

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2928#Entity types

Scope is as main value (Q54828448), as qualifier (Q54828449): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2928#Scope, SPARQL

This property is being used by: pt:Predefinição:Info/Telemóvel/Wikidata ca:Plantilla:Infotaula equipament informàtic, ca:Plantilla:Infotaula telèfon mòbil it:Template:Telefono cellulare be-x-old:Шаблён:Мабільны тэлефон cs:Šablona:Infobox - počítač vec:Modeło:Infobox de Aparato Informàdego uk:Шаблон:Стільниковий телефон, uk:Шаблон:Пристрій ga:Teimpléad:WD Bosca Sonraí Trealamh Ríomhaireachta hu:Sablon:Számítógép infobox, hu:Sablon:Mobiltelefon infobox be-tarask:Шаблён:Мабільны тэлефон nn:Mal:Infoboks datamaskin Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Units

Which items should be used for units? How many bytes would be in these units? Should we create new items for KB (=1024 bytes) and KB (=1000 bytes)? w:Kilobyte has two both definitions. It's linked from Q79726 with Russian and German descriptions diverging.
--- Jura 11:24, 23 June 2016 (UTC)

@Jura1: See kibibyte (Q79756). In older sources there wil always be some ambiguity. Lymantria (talk) 17:45, 1 July 2016 (UTC)

Working vs Storage capacity

@ Lymantria : The examples you give are Volatile/Working memory capacity. Should this be applied to non-volatile storage? Weird uses of memory off the top of my head:

• iPhone (Q621427) has 128 MB of RAM and 8 GB of Flash Memory
• PIC micro-controller uses a Harvard architecture with separate Program and Data. One chip effectively has 1 register and 128 "file registers" (128 bytes of RAM) with 16 KB of Flash ROM
• Sega NAOMI uses proprietary disc effectively as backup loading the full contents into RAM
• PLATO used the plasma display as "memory" (unsure if write-only)
• Delay line memory in Programma 101
  • Should PAL TVs have memory?

Could you clarify for the above examples? Dispenser (talk) 21:14, 12 May 2017 (UTC)

I think the first three examples are clear cases in which this property can be used, perhaps with extra qualifiers. The fourth example may use this property as well, but in some way it should be expressed that this is not the main use of the display. The fifth example I do not understand enough to say something about. The PAL TV Case I think is the best example of what I consider to be beyond the aim of this property. Lymantria (talk) 06:51, 13 May 2017 (UTC)

Renaming of this property from "memory capacity" to "volatile memory capacity"

In September 2019 this property was renamed from the more general "memory capacity" to "volatile random-access memory capacity" by Pixeldomain. The usage of the property does not reflect this change (i.e. on iPhone 7 (Q26831164)) and sparked a property proposal for a non-volatile counterpart, where I discussed why I would like to have a more general property.

Has there been any discussion about this? --Haansn08 (talk) 10:41, 5 June 2020 (UTC)

Requesting adding word (Q625642) to allowed units constraints

For early computers with non-byte fixed-length word memory alignment. E.g. d:Q572955 had 2048 addressable words, each 43 bit long, and no underlying byte structure. Retired electrician (talk) 07:43, 29 May 2021 (UTC)

• Also: requesting adding bits (megabit, kilobit) to constraints. E.g. 1Mbit DRAM chip had capacity in MBit, not MByte. Retired electrician (talk) 01:41, 17 December 2022 (UTC)