Primary Volume Descriptor
E459005
The Primary Volume Descriptor is a key data structure in ISO 9660 file systems that defines the overall layout and metadata of the disc, including directory locations and volume information.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Primary Volume Descriptor canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617263 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Primary Volume Descriptor Context triple: [Boot Record Volume Descriptor, relatedTo, Primary Volume Descriptor]
-
A.
Boot Record Volume Descriptor
Boot Record Volume Descriptor is a special ISO 9660 volume descriptor type that provides boot-related information enabling systems to start (boot) from an optical disc.
-
B.
ISO 9660
ISO 9660 is an international standard file system format primarily used for optical disc media such as CD-ROMs to ensure cross-platform data compatibility.
-
C.
VHDX
VHDX is a modern virtual hard disk file format developed by Microsoft that offers larger capacity, improved reliability, and better performance than the older VHD format, primarily for use with Hyper-V virtual machines.
-
D.
BIOS Parameter Block
The BIOS Parameter Block is a data structure in a disk’s boot sector that defines the volume’s layout and filesystem parameters, such as sector size, cluster size, and file allocation table details.
-
E.
VMDK
VMDK is a virtual disk file format originally developed by VMware for storing the contents and structure of virtual machine hard drives.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Primary Volume Descriptor Target entity description: The Primary Volume Descriptor is a key data structure in ISO 9660 file systems that defines the overall layout and metadata of the disc, including directory locations and volume information.
-
A.
Boot Record Volume Descriptor
Boot Record Volume Descriptor is a special ISO 9660 volume descriptor type that provides boot-related information enabling systems to start (boot) from an optical disc.
-
B.
ISO 9660
ISO 9660 is an international standard file system format primarily used for optical disc media such as CD-ROMs to ensure cross-platform data compatibility.
-
C.
VHDX
VHDX is a modern virtual hard disk file format developed by Microsoft that offers larger capacity, improved reliability, and better performance than the older VHD format, primarily for use with Hyper-V virtual machines.
-
D.
BIOS Parameter Block
The BIOS Parameter Block is a data structure in a disk’s boot sector that defines the volume’s layout and filesystem parameters, such as sector size, cluster size, and file allocation table details.
-
E.
VMDK
VMDK is a virtual disk file format originally developed by VMware for storing the contents and structure of virtual machine hard drives.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
ISO 9660 structure
ⓘ
file system data structure ⓘ |
| cardinality | exactly one per ISO 9660 volume ⓘ |
| containsField |
Abstract File Identifier
ⓘ
Application Identifier ⓘ Application Use ⓘ Bibliographic File Identifier ⓘ Copyright File Identifier ⓘ Data Preparer Identifier ⓘ File Structure Version ⓘ Location of Optional Type L Path Table ⓘ Location of Optional Type M Path Table ⓘ Location of Type L Path Table ⓘ Location of Type M Path Table ⓘ Logical Block Size ⓘ Path Table Size ⓘ Publisher Identifier ⓘ Root Directory Record ⓘ Standard Identifier ⓘ System Identifier ⓘ Volume Creation Date and Time ⓘ Volume Descriptor Type ⓘ Volume Descriptor Version ⓘ Volume Effective Date and Time ⓘ Volume Expiration Date and Time ⓘ Volume Identifier ⓘ Volume Modification Date and Time ⓘ Volume Sequence Number ⓘ Volume Set Identifier ⓘ Volume Set Size ⓘ Volume Space Size ⓘ |
| definedInStandard | ISO 9660 ⓘ |
| followedBy |
Supplementary Volume Descriptor
ⓘ
Volume Descriptor Set Terminator ⓘ Volume Partition Descriptor ⓘ |
| hasVolumeDescriptorTypeValue | 1 ⓘ |
| location | Volume Descriptor Set ⓘ |
| mustExist | true ⓘ |
| precededBy | Boot Record Volume Descriptor ⓘ |
| role |
defines overall layout of the disc
ⓘ
locates root directory ⓘ stores volume metadata ⓘ |
| standardIdentifierValue | CD001 ⓘ |
| usedFor |
identifying volume characteristics
ⓘ
locating path tables and directories ⓘ mounting ISO 9660 volumes ⓘ |
| usedIn | ISO 9660 file system ⓘ |
| volumeDescriptorVersionValue | 1 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Primary Volume Descriptor Description of subject: The Primary Volume Descriptor is a key data structure in ISO 9660 file systems that defines the overall layout and metadata of the disc, including directory locations and volume information.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.