Interactive map loads when it comes into view.
Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.
Topic orientation
Hard disk drive at a glance
The strongest research directions include History and Technology. Use the connected concepts below as starting points, not as a keyword checklist.
Research this topic
Explore the main themes, entities and connections around Hard disk drive. Start with the topic map, then use the sections below for research and deeper semantic analysis.
Explore this topic
Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.
History
29 related topics
Technology
47 related topics
Capacity
29 related topics
Access and interfaces
25 related topics
Key facts & relationships
High-confidence facts extracted from structured source data. Use them as anchors for further research.
- Date invented
- December 24, 1954; 71 years ago (1954-12-24)[c]
- Invented by
- IBM team led by Rey Johnson
Topics to explore
A structured outline of related entities, concepts and subtopics. Open any item to build a new map centered on it.Browse the full topic structure. Each item opens a new analysis centered on that subject.
Overview
- Computer data storage
- Digital data
- Magnetic storage
- Platters Hard disk drive platter
- Magnetic heads Disk read-and-write head
- Actuator
- Random-access
- Blocks Block (data storage)
- Non-volatile storage
- Enclosure Disk enclosure
- IBM
- 350 IBM 350
- 305 RAMAC IBM 305 RAMAC
- Secondary storage
- General-purpose computers History of general-purpose CPUs
- Servers Server (computing)
- Personal computers Personal computer
- Mobile phones Mobile phone
- Tablets Tablet computer
- Flash memory
- Seagate Seagate Technology
- Toshiba
- Western Digital
- Exabytes Exabyte
- Solid-state drives Solid-state drive
- NAND flash memory
- Performance Hard disk drive performance characteristics
- Unit prefixes Unit prefix
- TB Terabyte
- Gigabytes Gigabyte
History
- Megabytes Megabyte
- IBM 355
- IBM 7300
- IBM 1405
- Cylinder-mode Cylinder-head-sector
- Model 1311 IBM 1311
- Disk pack
- Magnetic tape
- IBM 2305 History of IBM magnetic disk drives
- Winchester IBM 3340
- Floppy disk drives Floppy disk drive
- Corvus Systems
- Tallgrass Technologies
- Apple ProFile
- IBM PC XT
- OEM
- Hardcards Hardcard
- Apple Macintosh
- SCSI
- Macintosh 128K
- Macintosh 512K
- Macintosh Plus
- Areal density Density (computer storage)
- Mainframe computers Mainframe computer
- Mass storage
- Moore's law
- Price elasticity of demand
- Product life cycle Marketing
- 2011 Thailand floods
Technology
- Ferromagnetic material
- Bits Bit
- Run-length limited
- Aluminum alloy
- Glass
- Ceramic
- Nm Nanometer
- Flying height
- Voice coil
- Stepper motor
- Zone bit recording
- Superparamagnetic Superparamagnetism
- Superparamagnetic limit
- Ruthenium
- Perpendicular recording
- Exchange spring media
- Frequency modulation
- Permanent magnet
- Moving coil
- Neodymium–iron–boron Neodymium magnet
- Magnet
- Loudspeakers Loudspeaker
- Magnet wire
- Tangential force Magnetic field
- Disk controller
- Servo Servomotor
- Error correction codes Error correction code
- Reed–Solomon error correction
- GB Gibibyte
- ECC Forward error correction
Capacity
- Decimal prefixes Decimal prefix
- Against HDD manufacturers Binary prefix
- IBM 3390
- CKD Count key data
- Cylinders Cylinder (disk drive)
- Logical block addressing
- Defect management Internal hard-drive defect management
- RAID
- Data integrity
- Checksums Checksum
- Hidden Host protected area
- Partition Disk partitioning
- Diskpart
- Windows
- Advanced Format
- Master boot record
- GUID Partition Table
- File Allocation Table
- MS-DOS
- Inodes Inode
- UNIX
- Metadata
- SI
- Memory Main memory
- Binary interpretation Binary prefixes
- Microsoft Windows
- Mac OS X
- Snow Leopard Mac OS X Snow Leopard
- Command-line utility
Form factors
- IBM 2314
- 19-inch rack
- RK05
- Fujitsu Eagle
- Floppy-disk drives (FDDs) Floppy disk
- Shugart Associates SA1000 Shugart Associates
Performance characteristics
- Time to access the data Access time
- Disk sector
- Bit rate
- Defragmentation
- Throughput
- Buffer Disk buffer
- File system fragmentation
- Price Price index
Access and interfaces
- Bus Bus (computing)
- ATA Advanced Technology Attachment
- Serial ATA
- Fibre Channel
- IEEE 1394 IEEE 1394 interface
- DSP Digital signal processor
- PRML
- Error detection and correction
- Small Computer System Interface
- Commodore Amiga Amiga peripherals
- Atari ST
- Integrated Drive Electronics
- "ultra DMA" (UDMA) AT Attachment
- Crosstalk
- Direct memory access
- CPU
- Fibre Channel Arbitrated Loop
- Storage area networks Storage area network
- ISCSI
- ATA over Ethernet
- Disk array controllers Disk array controller
- EIA-422
- Differential signaling
- RS485
- LocalTalk
Integrity and failure
Market segments
Economy
Competition from SSDs
Advanced semantic analysis
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
How this topic connects Entity context
Quick relationship hints grouped by predicate. Useful for spotting recurring semantic connections around the current entity.See the strongest relationship patterns around the current topic before diving into the raw triples.
Hard disk drive
Top relations
related to External links · 35
Hard disk drive → Archived October, Ariel Berkman, Data, February, Flexibility, Hard, Hard Disk Drive Power, Hard Disk Drives EncyclopediaVideo, Hard Drive's Service Areas, Hard Drives, HD, HDD, Helium, HGST, How, Inc, Information Sheet, January, Linux, Magnetic Recording
related to Calculation · 17
Hard disk drive → C/H/S, CHS, CKD, DASD, Furthermore, HDDs, IBM, In, LBA, Modern, Older IBM, SATA, Some, The, The C/H/S, This, When
related to Units · 16
Hard disk drive → By, GB, GB HDD, HDD, HDDs, However, In, Linux, Mac OS, MB, SI, Snow Leopard, Software, TB, The, The Microsoft Windows
related to Form factors · 12
Hard disk drive → Beginning, Digital's RK05, Fujitsu Eagle, HDDs, IBM, IBM's, In, Into, MB, RL01, The IBM, This
related to 1950s–1960s · 11
Hard disk drive → Access, Cylinder-mode, IBM, In, It, Model, Motion, RAMAC, The, Variants, While
related to Capacity · 4
Hard disk drive → Confusion, HDDs, TB, The
see also · 3
Hard disk drive → Automatic, Electronics, Object
Date invented · 1
Hard disk drive → December 24, 1954; 71 years ago (1954-12-24)[c]
Invented by · 1
Hard disk drive → IBM team led by Rey Johnson
Important terminology Word statistics
Frequent words and multi-word phrases across the lead, headings, infobox and body. Useful for terminology coverage.Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
Important terminology
disk data hdds drive drives platters hard hdd capacity magnetic storage heads used ibm per head density rate modern system
Entity relationships Subject–Predicate–Object triples
Extracted RDF-like relationships with confidence and source. The table includes structured facts and lower-confidence contextual relations.| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Hard disk drive | Date invented | December 24, 1954; 71 years ago (1954-12-24)[c] | 1.00 | infobox |
| Hard disk drive | Invented by | IBM team led by Rey Johnson | 1.00 | infobox |
| SATA | instance of | HDDs are connected to systems by standard interface cables | 0.80 | text |
| Corvus Systems | instance of | The subsystem was not sold under the drive manufacturer's name but under the subsystem manufacturer's name | 0.80 | text |
| Tallgrass Technologies | instance of | The subsystem was not sold under the drive manufacturer's name but under the subsystem manufacturer's name | 0.80 | text |
| or under the PC system manufacturer's name such as the Apple ProFile.The IBM PC XT in 1983 included an internal 10 MB HDD | instance of | The subsystem was not sold under the drive manufacturer's name but under the subsystem manufacturer's name | 0.80 | text |
| storage of entertainment content.In the 2000s | instance of | from the mainframe computers of the late 1950s to most mass storage applications including computers and consumer applications | 0.80 | text |
| 2010s | instance of | from the mainframe computers of the late 1950s to most mass storage applications including computers and consumer applications | 0.80 | text |
| NAND began supplanting HDDs in applications requiring portability or high performance | instance of | from the mainframe computers of the late 1950s to most mass storage applications including computers and consumer applications | 0.80 | text |
| megabytes | instance of | the total capacity of HDDs was given by manufacturers using SI decimal prefixes | 0.80 | text |
| drives/controllers with limited compatibility | instance of | with some minor exceptions | 0.80 | text |
| Western Digital Raptor but such drives have become much rarer as of 2016 | instance of | 000 rpm drives | 0.80 | text |
No triples extracted yet.
Related concept clusters Concept neighborhoods
Clusters of nearby vocabulary surrounding the topic. Scan them for adjacent concepts and language you may have missed.These clusters group vocabulary that occurs around closely connected concepts in the source material.
Connections between topic areas Semantic bridges
Bridge nodes connect otherwise separate parts of the map. Expand a row to inspect the topic groups on each side.Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.
Map overview Semantic statistics
Number of nodes, edges, triples, density and central hubs. Use it to gauge the size and connectivity of the map.Hard disk drive
Nodes233
Edges232
Triples113
Avg. degree1.99
Density0.008584
Components1
For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.