{
  "schemaVersion": 1,
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  "exactMpn": "WD40EFZZ",
  "runId": "buying-research-mainstream-five-20260912",
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    "hashKind": "research-payload-sha256",
    "algorithm": "SHA-256 of UTF-8 JSON with recursively sorted object keys, no optional whitespace, Unicode unescaped; remove only top-level provenance, reviewedAt, reviewedBy, editorialStatus."
  },
  "actors": [
    {
      "id": "legacy-qnap_research",
      "label": "GPT-5.6 Sol",
      "provider": "openai",
      "model": "gpt-5.6-sol",
      "effort": "xhigh",
      "agentRoleName": "qnap_research",
      "identityBasis": "Verified dispatch model selection and matching dated run report; not a provider-side attestation.",
      "evidenceRefs": [
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      ]
    },
    {
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      "label": "GPT-5.6 Sol",
      "provider": "openai",
      "model": "gpt-5.6-sol",
      "effort": "xhigh",
      "agentRoleName": "hdd_research",
      "identityBasis": "Verified dispatch model selection and matching dated run report; not a provider-side attestation.",
      "evidenceRefs": [
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    },
    {
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      "label": "GPT-5.6 Sol",
      "provider": "openai",
      "model": "gpt-5.6-sol",
      "effort": "xhigh",
      "agentRoleName": "other_nas_research",
      "identityBasis": "Verified dispatch model selection and matching dated run report; not a provider-side attestation.",
      "evidenceRefs": [
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    },
    {
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      "label": "GPT-6 (Codex)",
      "provider": "openai",
      "model": null,
      "modelFamily": "GPT-6",
      "effort": null,
      "agentRoleName": "root",
      "identityBasis": "Codex host model family confirmed; exact model variant/effort not preserved in the product audit. Unknown fields remain null.",
      "evidenceRefs": [
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        "reports/buying-research-all-products-20260910/browser-acceptance.json"
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    },
    {
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      "label": "Grok 4.6",
      "provider": "xai",
      "model": "grok-4.6",
      "effort": "xhigh",
      "identityBasis": "Verified execution receipt",
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    },
    {
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      "label": "GPT-6 (Codex)",
      "provider": "openai",
      "modelFamily": "GPT-6",
      "model": null,
      "effort": null,
      "identityBasis": "Host model family confirmed; exact variant and effort not asserted."
    },
    {
      "id": "mainstream-five-wd-grok",
      "label": "Grok 4.6",
      "provider": "xai",
      "model": "grok-4.6",
      "effort": "xhigh",
      "sessionId": "01a0931c-cad9-7667-b35b-24257c171254",
      "identityBasis": "Execution receipt and assistant-event model verified."
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  ],
  "events": [
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      "actorId": "legacy-hdd_research",
      "role": "research-and-self-review",
      "scope": "research and self-review",
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    },
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      "scope": "independent evidence review",
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      ]
    },
    {
      "id": "legacy-20260910-3",
      "actorId": "legacy-codex-root",
      "role": "integration-and-page-review",
      "scope": "integration and local page review",
      "legacyLabel": "/root — integration and local page review",
      "reviewedAt": "2026-09-10T02:57:11.326059+00:00",
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    },
    {
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      "role": "research-and-self-check",
      "status": "completed",
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    },
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      "changes": [
        {
          "field": "specifications/reviews/readerGuide",
          "change": "Added original-table workload and MTBF conditions; corrected legacy Pro bay limit; added omitted WD60 original chart values; reread WD120 original; clarified dated seller and measurement wording as applicable."
        }
      ]
    },
    {
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      "reviewedAt": "2026-09-11T09:00:59.175150+00:00",
      "scope": "Exact official MPN specifications, power/acoustic/environment columns and footnotes; original test evidence and applicability; primary merchant states and dated retained offers. Partial coverage and original-image/video gaps remain explicit.",
      "evidenceChecks": [
        "Exact capacity/MPN columns and footnotes checked in original September2025 Plus or January2025 Pro tables; WD30 uses original March2023 table and remains explicitly absent from current table.",
        "Current official WD103 product page and Pro cover both say unlimited bay count; replaced stale24-bay claim. MTBF and annualized workload conditions preserved with correct Plus/Pro distinction.",
        "Primary Newegg original buy boxes inspected earlier and exact seller/price/stock/new flags verified; dated baseline quotations retained, unknown-seller duplicates retired with recorded reasons.",
        "No exact NAS HCL approval or new index approval inferred; RV/sector, video, inaccessible merchants and measurement gaps retained."
      ]
    },
    {
      "actorId": "mainstream-five-wd-grok",
      "role": "research-and-self-check",
      "status": "completed",
      "researchedAt": "2026-09-12",
      "scope": "Targeted supplementary draft; subsequent parent corrections are attributed separately. Original CLI result retained in local execution record."
    },
    {
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      "status": "completed",
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      "reviewedAt": "2026-09-12T01:27:47.784777+00:00",
      "changes": [
        "No exact-MPN benchmark added; keep WD40EFPX/EFZX measurements separate.",
        "Add only the observed CDW offer, leaving availability unknown and preserving earlier offer dates."
      ]
    },
    {
      "actorId": "current-codex-root",
      "role": "independent-review",
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      "reviewedAt": "2026-09-12T01:27:47.784777+00:00",
      "scope": "Independent review of new adopted original evidence and final applicability; preserve earlier accepted facts and source history. This review is of the supplement, not a claim to re-test the drive or reread all historical offers.",
      "evidenceChecks": [
        "Full short CDW original read:WD40EFZZ,Mfg#,4TB,128MB,5400RPM,$212.99,AddToCart; no explicit stock status.",
        "Full short Firebls stub read;WD40EFZX,notEFZZ;no performance figures adopted.",
        "Syobon DXP2800 full article read and original photos06/07/08 visually inspected;WD40EFPX-68C6CN0. Grok independently viewed07/08. No array performance assigned to EFZZ.",
        "PCLINE full text lacks documented original method/output;ArigatoNAS comparison estimates and linked WD Blue4TB array do not qualify."
      ]
    }
  ],
  "sourceOrigins": {
    "status": "not-inferred-per-source",
    "explanation": "The recorded page researchers/reviewers do not prove who originally discovered or reread each inherited source. Source-level historical author attribution is unknown unless a specific source audit establishes it."
  },
  "sources": [
    {
      "id": "datasheet",
      "title": "WD Red Plus HDD data sheet (September 2025)",
      "url": "https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-red-plus-hdd/data-sheet-western-digital-wd-red-plus-hdd.pdf",
      "kind": "official",
      "checkedAt": "2026-09-11",
      "locator": "September 2025 p.2 column WD40EFZZ; footnotes 1–10",
      "readAction": "opened",
      "readScope": "pdftotext of downloaded September 2025 PDF",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": [
        {
          "sha256": "58fc4e4899ef088a8b4896b0ca44b10e473556249d0f6fc17bd1b0c63039bc8c",
          "mimeType": "application/pdf",
          "sourceUrl": "https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-red-plus-hdd/data-sheet-western-digital-wd-red-plus-hdd.pdf",
          "description": "WD Red Plus DS September 2025"
        }
      ]
    },
    {
      "id": "offer-newegg",
      "title": "Newegg WD40EFZZ product listing",
      "url": "https://www.newegg.com/western-digital-wd40efzz-4tb-5400-rpm/p/1Z4-0002-01R24",
      "kind": "merchant",
      "checkedAt": "2026-09-08T15:44:30.576192+00:00",
      "locator": "Primary offer sold and shipped by Newegg; Add to cart; limit 2 per customer; new standard listing.",
      "readAction": "opened",
      "readScope": "Saved Newegg PDP HTML",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": [
        {
          "sha256": "0c2ed5718a76ed19dfe6d3059f5c1c27677699e585c35185bef9a60aca597b5c",
          "mimeType": "text/html",
          "sourceUrl": "https://www.newegg.com/western-digital-wd40efzz-4tb-5400-rpm/p/1Z4-0002-01R24",
          "description": "Newegg WD40EFZZ"
        }
      ]
    },
    {
      "id": "offer-bandh",
      "title": "B&H WD40EFZZ product listing",
      "url": "https://www.bhphotovideo.com/c/product/1944649-REG/wd_wd40efzz_spcpan0_red_plus_4tb_internal.html",
      "kind": "merchant",
      "checkedAt": "2026-09-08T15:49:13.111291+00:00",
      "locator": "MFR WD40EFZZ-SPCPAN0; exact base MPN, 4 TB and quantity 1; In Stock and Add to Cart.",
      "readAction": "not-attempted",
      "readScope": "Not re-fetched this round; dated offer reused without a new timestamp",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": []
    },
    {
      "id": "offer-western-digital",
      "title": "Western Digital WD40EFZZ product listing",
      "url": "https://www.westerndigital.com/products/internal-drives/wd-red-plus-sata-3-5-hdd?sku=WD40EFZZ",
      "kind": "merchant",
      "checkedAt": "2026-09-08T15:44:30.730628+00:00",
      "locator": "Exact SKU title/model confirmed; price and inventory appear as unresolved template fields. No stock inference from hidden buttons.",
      "readAction": "opened",
      "readScope": "Saved manufacturer HTML shell; live USD not isolated from JS template",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": [
        {
          "sha256": "0c7393396246e8fa40fca5b482886a15f0fe3c527591db8ade2316cda96e94ae",
          "mimeType": "text/html",
          "sourceUrl": "https://www.westerndigital.com/products/internal-drives/wd-red-plus-sata-3-5-hdd?sku=WD40EFZZ",
          "description": "WD store WD40EFZZ"
        }
      ]
    },
    {
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      "title": "Newegg: WD40EFZZ current US new listing",
      "url": "https://www.newegg.com/western-digital-wd40efzz-4tb-5400-rpm/p/1Z4-0002-01R24",
      "kind": "merchant",
      "checkedAt": "2026-09-10",
      "locator": "Exact MPN in H1; selected main offer shows Add to cart, seller Newegg, and a visible price of $194.99.",
      "readAction": "opened",
      "readScope": "Saved Newegg PDP HTML",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": [
        {
          "sha256": "0c2ed5718a76ed19dfe6d3059f5c1c27677699e585c35185bef9a60aca597b5c",
          "mimeType": "text/html",
          "sourceUrl": "https://www.newegg.com/western-digital-wd40efzz-4tb-5400-rpm/p/1Z4-0002-01R24",
          "description": "Newegg WD40EFZZ"
        }
      ]
    },
    {
      "id": "related-techradar-wd40efpx",
      "title": "WD Red Plus 4TB internal NAS HDD review (WD40EFPX)",
      "url": "https://www.techradar.com/pro/wd-red-plus-4tb-internal-nas-hdd-review",
      "kind": "review",
      "checkedAt": "2026-09-11",
      "locator": "Author identifies WD40EFPX; PC AJA/ATTO/CrystalDiskMark vs ST4000VN006; NAS 2.5GbE result called artificial",
      "readAction": "opened",
      "readScope": "Saved article HTML; WD40EFPX identified",
      "readingActorId": "b06-grok",
      "checkedOn": "2026-09-11",
      "materials": [
        {
          "sha256": "cf7243c1caa3100be52f0d72e3a91f77c66c1da1859f8cfac7f86558090aee37",
          "mimeType": "text/html",
          "sourceUrl": "https://www.techradar.com/pro/wd-red-plus-4tb-internal-nas-hdd-review",
          "description": "TechRadar WD40EFPX"
        }
      ]
    },
    {
      "id": "offer-cdw-20260912",
      "title": "CDW WD Red Plus 4 TB WD40EFZZ",
      "url": "https://www.cdw.com/product/wd-red-plus-hard-drive-4-tb-sata-6gb-s/9032975",
      "kind": "merchant",
      "checkedAt": "2026-09-12",
      "locator": "Mfg # WD40EFZZ; $212.99; Add To Cart; 128 MB buffer; 5400 rpm; 4 TB; 3.5-inch SATA 6 Gb/s",
      "readAction": "opened",
      "readScope": "Header/price/Mfg#/Add to Cart",
      "readingActorId": "mainstream-five-wd-grok",
      "materials": [
        {
          "sha256": "e96d5bbfd954b595946e4853b2a664e61042068e2d466aaeb3461c5784eaba6f",
          "mimeType": "text/html",
          "sourceUrl": "https://www.cdw.com/product/wd-red-plus-hard-drive-4-tb-sata-6gb-s/9032975",
          "description": "CDW WD40EFZZ"
        }
      ]
    },
    {
      "id": "related-firebls-wd40efzx",
      "title": "Firebls WD40EFZX 4 TB Red Plus article stub (2021-12-13)",
      "url": "https://fireblsblog.de/2021/12/13/western-digital-red-plus-4-tb-wd40efzx-im-test-wds-aktuelle-red-plus-mit-luft/",
      "kind": "review",
      "checkedAt": "2026-09-12",
      "locator": "Title and dek identify WD40EFZX replacing WD40EFRX; later teaser points to a WD40EFPX test. Not WD40EFZZ.",
      "readAction": "opened",
      "readScope": "HTML stub title/dek",
      "readingActorId": "mainstream-five-wd-grok",
      "materials": [
        {
          "sha256": "e404daab7bc0bf2b21cbe95c9230dd15e339de3dbf1cad34022d879a937d6ed7",
          "mimeType": "text/html",
          "sourceUrl": "https://fireblsblog.de/2021/12/13/western-digital-red-plus-4-tb-wd40efzx-im-test-wds-aktuelle-red-plus-mit-luft/",
          "description": "Firebls WD40EFZX stub"
        }
      ]
    },
    {
      "id": "related-syobon-wd40efpx",
      "title": "しょぼんブログ DXP2800 review photos: WD40EFPX-68C6CN0, not WD40EFZZ",
      "url": "https://syobon.jp/blog/2025/01/19/ugreen-nasync-dxp2800/",
      "kind": "review",
      "checkedAt": "2026-09-12",
      "locator": "Original photos 07/08 label WD40EFPX / MDL WD40EFPX-68C6CN0; S/N WX42D642TTZH; Thailand 24 AUG 2024",
      "readAction": "opened",
      "readScope": "Independent visual of photo07/08 labels; CDM array numbers not adopted for EFZZ so CDM screenshots not used as performance evidence",
      "readingActorId": "mainstream-five-wd-grok",
      "materials": [
        {
          "sha256": "f2f6b1267f16e6e6a68158b62d80750f93b1cbfb0fda43369574439ee79a3b73",
          "mimeType": "image/jpeg",
          "sourceUrl": "https://syobon.jp/blog/2025/01/19/ugreen-nasync-dxp2800/",
          "description": "Syobon photo07 WD40EFPX-68C6CN0"
        },
        {
          "sha256": "e7258cf418de03165cf8630fd44e6b6944fc76399018a1c7729429595bfc68c9",
          "mimeType": "image/jpeg",
          "sourceUrl": "https://syobon.jp/blog/2025/01/19/ugreen-nasync-dxp2800/",
          "description": "Syobon photo08 WD40EFPX-68C6CN0"
        }
      ]
    }
  ],
  "coverage": {
    "productId": "western-digital-wd-red-plus-wd40efzz-4tb",
    "before": {
      "specifications": 36,
      "reviews": 0,
      "measurements": 0,
      "sources": 6,
      "relatedSourceRecords": 1,
      "offers": 3,
      "gaps": [
        {
          "topic": "Exact-model independent tests",
          "detail": "TechRadar and NASCompares 4TB videos/articles identify WD40EFPX, not WD40EFZZ.",
          "affectsVerdict": true
        },
        {
          "topic": "Exact NAS compatibility",
          "detail": "Synology lists seen in search summaries named WD40EFPX/WD40EFZX, not WD40EFZZ.",
          "affectsVerdict": true
        },
        {
          "topic": "RV sensors and sector size",
          "detail": "Not separately specified in the exact-model table. Marketing pages mention RV sensors for the Red family; the Plus table has no RV column.",
          "affectsVerdict": false
        },
        {
          "topic": "B&H / Best Buy live PDP",
          "detail": "B&H $239.99 is dated 2026-09-08. The 2026-09-10 Newegg row is Newegg-sold $194.99. Parent primary-sold-by parse of the saved HTML agrees (UnitCost $194.99, ShippingCharge $0.01, IsNew). That parse does not refresh the observation time.",
          "affectsVerdict": false
        },
        {
          "topic": "Exact-MPN original video",
          "detail": "DXM7znUSIPg names WD40EFPX. Tooling could not obtain YouTube ASR without extra credentials.",
          "affectsVerdict": false
        }
      ]
    },
    "after": {
      "specifications": 36,
      "reviews": 0,
      "measurements": 0,
      "sources": 9,
      "relatedSourceRecords": 3,
      "offers": 4,
      "gaps": [
        {
          "topic": "Exact-model independent tests",
          "detail": "Still no WD40EFZZ lab. TechRadar and NASCompares 4TB coverage identify WD40EFPX. Firebls 2021 coverage identifies WD40EFZX. Syobon DXP2800 4TB RAID1 photos are WD40EFPX-68C6CN0. PCLINE self-asserts testing without outputs. ArigatoNAS estimates from specs; its 2.5GbE test used WD Blue 4TB.",
          "affectsVerdict": true
        },
        {
          "topic": "Exact NAS compatibility",
          "detail": "Synology compatibility URLs returned JavaScript shells with no extractable table this round. Search summaries name WD40EFPX/WD40EFZX for some DiskStations, not WD40EFZZ. QNAP EU store merchandises WD40EFZZ; that is not a US HCL extract.",
          "affectsVerdict": true
        },
        {
          "topic": "RV sensors and sector size",
          "detail": "Not separately specified in the exact-model table. Marketing pages mention RV sensors for the Red family; the Plus table has no RV column.",
          "affectsVerdict": false
        },
        {
          "topic": "B&H / Best Buy live PDP",
          "detail": "B&H $239.99 remains 2026-09-08. Best Buy JXTHCC7V3X was not successfully fetched. CDW $212.99 captured 2026-09-12. Target Spacebound listing had no visible USD.",
          "affectsVerdict": false
        },
        {
          "topic": "Exact-MPN original video",
          "detail": "YouTube results for WD40EFZZ did not yield an exact-MPN benchmark. C7faCi__zLI is WD40EFPX-68C6CN0 spin-up/spin-down sound. DXM7znUSIPg remains WD40EFPX. ASR/frames were not obtained.",
          "affectsVerdict": false
        }
      ]
    },
    "status": "integrated-and-reviewed",
    "parentReviewRef": "reports/buying-research-mainstream-five-20260912/parent-review.json",
    "remainingGapPolicy": "Retain missing evidence; no forced review quota or automatic indexing approval."
  },
  "retiredRecords": [],
  "originalMaterial": {
    "status": "per-source-records",
    "note": "Available original captures are retained locally with SHA-256. Public records contain source URLs and locators; they do not reproduce full third-party content. An absent capture is not a claim of a saved original."
  },
  "supplementHistory": [
    {
      "runId": "buying-research-mainstream-five-20260912",
      "previousSubjectSha256": "b42222beca1283e9c5bc8066b6d61e194ec4c9d894c08480abcd4adc4acec791",
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      "sourceCountBefore": 6,
      "sourceCountAfter": 9
    }
  ]
}