{
  "events": [
    {
      "id": "e-magnetic-wire",
      "date": "1898",
      "title": "Magnetic wire recording",
      "summary": "Valdemar Poulsen patents magnetic recording on wire, early ancestor of magnetic storage.",
      "relatedSlugs": ["tape"],
      "citationIds": ["tc1"]
    },
    {
      "id": "e-tape-univac",
      "date": "1951",
      "title": "UNIVAC tape drives",
      "summary": "Commercial computer tape storage enters the market alongside early electronic computers.",
      "relatedSlugs": ["tape"],
      "citationIds": ["tc2"]
    },
    {
      "id": "e-ramac",
      "date": "1956",
      "title": "IBM 305 RAMAC",
      "summary": "First commercial HDD product: fifty 24-inch disks, about 5 MB total capacity.",
      "relatedSlugs": ["ramac", "hdd"],
      "citationIds": ["tc3"]
    },
    {
      "id": "e-winchester",
      "date": "1973",
      "title": "Winchester HDD architecture",
      "summary": "IBM's 3340 pairs low-mass heads and lubricated disks inside a removable 3348 data module; fixed media are not a requirement of the original Winchester design.",
      "relatedSlugs": ["hdd", "winchester-architecture", "defect-skipping"],
      "citationIds": ["tc4", "tc-winchester-mulvany"]
    },
    {
      "id": "e-st506",
      "date": "1980",
      "title": "ST-506 interface",
      "summary": "Seagate ships ST-506, defining a de facto HDD interface before integrated controllers.",
      "relatedSlugs": ["hdd", "scsi"],
      "citationIds": ["tc5"]
    },
    {
      "id": "e-scsi-standard",
      "date": "1986",
      "title": "SCSI standardization",
      "summary": "ANSI X3.131 SCSI enables parallel storage buses for HDDs and tape in servers.",
      "relatedSlugs": ["scsi", "sas", "tape"],
      "citationIds": ["tc6"]
    },
    {
      "id": "e-ata-pata",
      "date": "1994",
      "title": "ATA/IDE in PCs",
      "summary": "Integrated drive electronics and ATA become the dominant PC HDD attachment.",
      "relatedSlugs": ["pata", "hdd", "consumer-ssd"],
      "citationIds": ["tc7"]
    },
    {
      "id": "e-longitudinal-limit",
      "date": "2005",
      "title": "Longitudinal recording plateau",
      "summary": "Industry shifts investment to perpendicular recording as longitudinal areal density stalls.",
      "relatedSlugs": ["longitudinal-recording", "pmr"],
      "citationIds": ["tc8"]
    },
    {
      "id": "e-pmr-shipping",
      "date": "2005",
      "title": "Perpendicular recording products",
      "summary": "Vendors ship PMR-based HDDs, extending areal density beyond longitudinal limits.",
      "relatedSlugs": ["pmr", "cmr", "hdd"],
      "citationIds": ["tc9"]
    },
    {
      "id": "e-nand-ssd",
      "date": "2007",
      "title": "NAND SSDs in notebooks",
      "summary": "Flash SSDs begin replacing HDDs in performance-sensitive mobile systems.",
      "relatedSlugs": ["ssd", "nand-flash", "mlc", "consumer-ssd"],
      "citationIds": ["tc10"]
    },
    {
      "id": "e-sata-3",
      "date": "2009",
      "title": "SATA 6 Gb/s",
      "summary": "SATA revision 3.0 doubles interface speed, common ceiling for consumer SSDs and HDDs.",
      "relatedSlugs": ["sata", "consumer-ssd", "nearline-hdd"],
      "citationIds": ["tc11"]
    },
    {
      "id": "e-smr-commercial",
      "date": "2013",
      "title": "SMR HDDs announced",
      "summary": "Shingled magnetic recording HDDs trade rewrite flexibility for higher areal density.",
      "relatedSlugs": ["smr", "cmr", "hm-smr", "device-managed-smr"],
      "citationIds": ["tc12"]
    },
    {
      "id": "e-helium-drives",
      "date": "2013",
      "title": "Helium-filled HDDs",
      "summary": "WD ships helium-sealed drives enabling more platters and lower drag inside the chassis.",
      "relatedSlugs": ["helium-hdd", "nearline-hdd"],
      "citationIds": ["tc13"]
    },
    {
      "id": "e-nvme-1",
      "date": "2014",
      "title": "NVMe 1.0 published",
      "summary": "NVM Express standardizes a lean protocol for PCIe-attached non-volatile memory.",
      "relatedSlugs": ["nvme", "pcie-storage", "enterprise-ssd"],
      "citationIds": ["tc14"]
    },
    {
      "id": "e-3dxpoint-announce",
      "date": "2015",
      "title": "3D XPoint announced",
      "summary": "Intel and Micron announce 3D XPoint as a new non-volatile memory technology.",
      "relatedSlugs": ["3d-xpoint", "optane"],
      "citationIds": ["tc15"]
    },
    {
      "id": "e-tlc-ssd-mainstream",
      "date": "2015",
      "title": "TLC SSDs mainstream",
      "summary": "TLC NAND becomes default for consumer SSD cost per GB as controllers mature.",
      "relatedSlugs": ["tlc", "qlc", "consumer-ssd"],
      "citationIds": ["tc16"]
    },
    {
      "id": "e-optane-ssd",
      "date": "2017",
      "title": "Intel Optane SSDs",
      "summary": "Optane-branded SSDs bring 3D XPoint to PCIe storage products.",
      "relatedSlugs": ["optane", "3d-xpoint", "enterprise-ssd"],
      "citationIds": ["tc17"]
    },
    {
      "id": "e-dual-actuator",
      "date": "2019",
      "title": "Dual-actuator nearline HDD",
      "summary": "Seagate ships dual-actuator drives targeting nearline throughput for hyperscale.",
      "relatedSlugs": ["dual-actuator", "nearline-hdd"],
      "citationIds": ["tc18"]
    },
    {
      "id": "e-hamr-mamr-race",
      "date": "2020",
      "title": "HAMR and MAMR roadmaps",
      "summary": "HDD vendors publicize energy-assisted recording paths beyond PMR alone.",
      "relatedSlugs": ["hamr", "mamr", "pmr"],
      "citationIds": ["tc19"]
    },
    {
      "id": "e-qlc-enterprise",
      "date": "2020",
      "title": "QLC in enterprise SSDs",
      "summary": "QLC NAND appears in capacity-oriented enterprise SSD lines with heavy FTL tuning.",
      "relatedSlugs": ["qlc", "enterprise-ssd", "ftl"],
      "citationIds": ["tc20"]
    },
    {
      "id": "e-edsff",
      "date": "2020",
      "title": "EDSFF form factors",
      "summary": "Enterprise & Data Center SSD Form Factor family gains traction for dense NVMe.",
      "relatedSlugs": ["edsff", "e1-s", "nvme"],
      "citationIds": ["tc21"]
    },
    {
      "id": "e-lto-9",
      "date": "2020",
      "title": "LTO-9 specification",
      "summary": "LTO Program publishes generation 9 tape format for continued cold-archive scaling.",
      "relatedSlugs": ["lto", "tape", "hot-warm-cold"],
      "citationIds": ["tc22"]
    },
    {
      "id": "e-optane-wind-down",
      "date": "2022",
      "title": "Intel exits Optane storage",
      "summary": "Intel winds down Optane consumer and many datacenter SSD products.",
      "relatedSlugs": ["optane", "3d-xpoint"],
      "citationIds": ["tc23"]
    },
    {
      "id": "e-hamr-shipping",
      "date": "2024",
      "title": "HAMR HDDs ship",
      "summary": "Seagate reports volume shipments of HAMR-based nearline drives.",
      "relatedSlugs": ["hamr", "nearline-hdd", "mamr"],
      "citationIds": ["tc24"]
    },
    {
      "id": "e-glass-storage-research",
      "date": "unknown",
      "title": "Glass archival demos",
      "summary": "Microsoft Project Silica and others demonstrate long-duration data in glass media.",
      "relatedSlugs": ["glass-storage", "optical-archival", "hot-warm-cold"],
      "citationIds": ["tc25"]
    }
  ],
  "citations": [
    {
      "id": "tc-winchester-mulvany",
      "title": "R. B. Mulvany, Engineering Design of a Disk Storage Facility with Data Modules (1974), pp. 489-494",
      "url": "https://www.mirrorservice.org/sites/www.bitsavers.org/pdf/ibm/IBM_Journal_of_Research_and_Development/186/ibmrd1806D.pdf",
      "accessed": "2026-10-11"
    },
    {
      "id": "tc1",
      "title": "Magnetic recording — historical overview",
      "url": "https://en.wikipedia.org/wiki/Magnetic_recording",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc2",
      "title": "UNIVAC Magnetic Tape",
      "url": "https://www.computerhistory.org/revolution/memory-storage/8/187/695",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc3",
      "title": "Computer History Museum — 1956: First commercial hard disk drive shipped (The Storage Engine, IBM Model 350 RAMAC)",
      "url": "https://www.computerhistory.org/storageengine/first-commercial-hard-disk-drive-shipped/",
      "accessed": "2026-10-16"
    },
    {
      "id": "tc4",
      "title": "Winchester disk drive",
      "url": "https://en.wikipedia.org/wiki/Winchester_disk_drive",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc5",
      "title": "ST-506",
      "url": "https://en.wikipedia.org/wiki/ST-506",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc6",
      "title": "SCSI",
      "url": "https://en.wikipedia.org/wiki/SCSI",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc7",
      "title": "Parallel ATA",
      "url": "https://en.wikipedia.org/wiki/Parallel_ATA",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc8",
      "title": "Perpendicular recording",
      "url": "https://en.wikipedia.org/wiki/Perpendicular_recording",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc9",
      "title": "Toshiba perpendicular recording HDD",
      "url": "https://www.toshiba-storage.com/cms/en-us/news/2005/01/perpendicular.html",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc10",
      "title": "Solid-state drive",
      "url": "https://en.wikipedia.org/wiki/Solid-state_drive",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc11",
      "title": "Serial ATA",
      "url": "https://en.wikipedia.org/wiki/Serial_ATA",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc12",
      "title": "Shingled magnetic recording",
      "url": "https://en.wikipedia.org/wiki/Shingled_magnetic_recording",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc13",
      "title": "Helium drive",
      "url": "https://en.wikipedia.org/wiki/Helium_drive",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc14",
      "title": "NVM Express",
      "url": "https://nvmexpress.org/specifications/",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc15",
      "title": "Intel and Micron produce breakthrough memory technology",
      "url": "https://www.intel.com/content/www/us/en/newsroom/news/intel-micron-produce-breakthrough-memory-technology.html",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc16",
      "title": "Triple-level cell",
      "url": "https://en.wikipedia.org/wiki/Triple-level_cell",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc17",
      "title": "Intel Optane SSD",
      "url": "https://www.intel.com/content/www/us/en/products/docs/memory-storage/optane-memory-series/intel-optane-ssd-900p-series-brief.html",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc18",
      "title": "Seagate dual actuator technology",
      "url": "https://www.seagate.com/products/enterprise-drives/exos-x/mach2/",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc19",
      "title": "Heat-assisted magnetic recording",
      "url": "https://en.wikipedia.org/wiki/Heat-assisted_magnetic_recording",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc20",
      "title": "Quad-level cell",
      "url": "https://en.wikipedia.org/wiki/Quad-level_cell",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc21",
      "title": "Enterprise & Data Center SSD Form Factor",
      "url": "https://en.wikipedia.org/wiki/Enterprise_and_Data_Center_SSD_Form_Factor",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc22",
      "title": "LTO Ultrium",
      "url": "https://en.wikipedia.org/wiki/Linear_Tape-Open",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc23",
      "title": "Intel winding down Optane",
      "url": "https://www.intel.com/content/www/us/en/newsroom/news/intel-winding-down-optane-memory-business.html",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc24",
      "title": "Seagate begins shipping HAMR drives",
      "url": "https://www.seagate.com/news/news-archive/seagate-begins-shipping-hamr-drives/",
      "accessed": "2026-03-26"
    },
    {
      "id": "tc25",
      "title": "Project Silica",
      "url": "https://www.microsoft.com/en-us/research/project/project-silica/",
      "accessed": "2026-03-26"
    }
  ]
}