Internal storage discovery
Keep the older 52-position Mini PCI Express / mSATA socket family distinct from M.2, and keep shared physical form separate from electrical function.
Question this page answers
The Mini PCI Express / mSATA record represents a shared physical connector family; its engineering sidecar documents bounded physical orientation without declaring the two uses electrically interchangeable.
M.2 is represented by a separate keyed card-edge record. Similar internal-card roles are not evidence of physical or electrical interchangeability.
Connector resemblance, card size or an internal-storage role does not establish electrical interchangeability or host support.
These V52 guides reorganize facts and explicit unknowns already present in the atlas. They add no new hardware claim, universal pinout, measured performance result, compatibility verdict, installation approval or fabrication approval.
Evidence behind this page
16 linked sources · 27 scoped claims · 0 sources with inspection/access flags.
Page scope: Connector resemblance, card size or an internal-storage role does not establish electrical interchangeability or host support.
Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.
Kingston · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30
Within inspection window
Scoped support: M.2 physical fit does not establish SATA / PCIe / NVMe support.
Not established / limitations: Historical throughput examples and broad product marketing are not used.
Locator: M.2 physical sizes, B/M keys, host compatibility and hot-plug questions
TE Connectivity · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04
Within inspection window
Scoped support: Product-specific recognition reference for the shared 52-position Mini PCI Express/mSATA connector family; no host protocol support is inferred.
Not established / limitations: Source-backed identification does not establish universal wiring, protocol generation, device compatibility, safe installation or fabrication approval.
Locator: Product summary and features: bus type, number of positions and centerline
Molex · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04
Within inspection window
Scoped support: Manufacturer-example numbering/orientation and pitch context for a 52-position Mini PCI Express connector; no logical signal assignment is normalized.
Not established / limitations: Product drawing is an example component, not a universal mSATA/Mini PCIe signal map or fabrication approval for another connector.
Locator: Sales drawing: 0.8 mm pitch, 52 circuits and odd/even card-side numbering reference
Dell · Manufacturer / product-owner domain · inspected 2026-10-08 · due 2027-01-06
Within inspection window
Scoped support: Nominal module-format examples 2242 and 2280; not connector mating dimensions.
Not established / limitations: The general key/capability table is not adopted as a universal host rule. No Dell artwork, measured geometry, tolerance, contact assignment or exact-host approval is supplied.
Locator: Article 000144170, version 12; last modified 30 September 2026. M.2 Cards section, Figure 1 examples (b), (c) and (d).
ATP Electronics · Unclassified publisher domain · inspected 2026-10-08 · due 2027-01-06
Within inspection window
Scoped support: Separating mechanical key/format, wired interface, lane implementation, clearance and firmware requirements.
Not established / limitations: Manufacturer explanatory guide, not an inspected PCI-SIG M.2 standard. Numeric notch/contact positions, marketing throughput, capacity and universal key-to-protocol rules are not adopted. No third-party illustrations are copied.
Locator: Published 22 June 2026; sections on keying versus wiring, compatibility checklist, mechanical clearance and firmware. No numbered revision stated.
ASUS · Manufacturer / product-owner domain · inspected 2026-10-08 · due 2027-01-06
Within inspection window
Scoped support: Selected storage and PCIe slot roles for PRIME B550-PLUS AC-HES only, with CPU, slot population and SATA-sharing conditions.
Not established / limitations: Not the ordinary PRIME B550-PLUS or every B550 motherboard. Selected internal groups only; no current BIOS verification, boot qualification, entire port inventory or hardware test. Manual conditions must not be generalized.
Locator: E18712, First Edition, July 2021; specification summary printed vi–vii and layout 1-2. PDF pages 2, 6, 7 and 12 visually inspected.
StarTech.com · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09
Within inspection window
Scoped support: SATA B/B+M M.2 support and explicit NVMe/AHCI PCIe exclusion. Conflicting module-length lists are not normalized into a claim.
Not established / limitations: Named example only. No universal compatibility or publication approval. Raw-byte acquisition status is recorded separately.
Locator: PDF pages 2–3: Features, Compatible Drive Types and General Specifications. Visually inspected.
TE Connectivity · Manufacturer / product-owner domain · inspected 2026-10-13 · due 2027-01-11
Within inspection window
Scoped support: M.2 socket family; source-observed M-key representative and key/part variants.
Not established / limitations: PDF metadata says B3, but inspected drawing title blocks say B4; drawing content governs this observation. No claim this is the latest released revision.
Locator: Sheets 1–3 of 4 visually inspected. Sheet 1 revision B4 dated 05 NOV 2024; sheet 2 shows 1-2199230-5 and the key/part table; sheet 3 is a PCB footprint, not a mating view.
TE Connectivity · Manufacturer / product-owner domain · inspected 2026-10-13 · due 2027-01-11
Within inspection window
Scoped support: 52-position socket; board-socket role, split contact banks, separate interface assignments and mounting context.
Not established / limitations: Historical E2 drawing, not current-device certification. Signal assignments, dimensions and keepout templates are not reproduced.
Locator: Sheets 1–2 of 5 visually inspected. Sheet 1 revision E2, 05 JUN 2017: socket views and separate interface-assignment tables. Sheet 2: half/full-size card mounting keepouts.
EKF Elektronik GmbH · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: pp.17-18, NVMe PCIe x4 M.2 M-Key (pins 1-38 and 39-75), EKF Part #255.50.2.2223.10
Transcend Information, Inc. · Manufacturer / product-owner domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: PDF p.6, Pin Assignments table and four footnotes; p.5 mechanical card form
Kontron · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: p. 48, section 13.1.7, Table 24 M.2 Key M Socket Pin Assignment
Apacer Technology Inc. · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 1; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 10; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 11; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 2; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 20; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 21; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 22; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 3; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 4; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 5; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 6; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 8; note 1 on printed p. 7; printed p. 5 (PDF p. 6), Table 3-1 Pin Assignments, row 9; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 23; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 24; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 25; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 26; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 27; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 28; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 29; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 30; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 31; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 32; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 33; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 34; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 35; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 36; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 37; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 38; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 39; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 40; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 41; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 42; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 43; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 44; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 45; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 46; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 47; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 48; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 49; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 50; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 51; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 52; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 53; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 54; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 55; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 56; note 1 on printed p. 7; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 57; printed p. 6 (PDF p. 7), Table 3-1 Pin Assignments, row 58; note 1 on printed p. 7; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 67; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 68; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 69; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 70; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 71; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 72; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 73; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 74; printed p. 7 (PDF p. 8), Table 3-1 Pin Assignments, row 75; printed pp. 5-7 (PDF pp. 6-8), section 3, Table 3-1 and Figure 3-1 top view
Advantech Co., Ltd. · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: printed p.31 (PDF p.39), Appendix A.4.3 Mini PCIE slot (MINIPCIE), complete table and power notes
Transcend Information, Inc. · Manufacturer / product-owner domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: PDF p. 6, Pin Assignments table and Pin Layout drawings; presence-detection and DAS/DSS footnotes; PDF p.6, Pin Assignments table, DAS/DSS and Presence Detection footnotes
Kontron Technology A/S · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19
Within inspection window
Scoped support: Exact named pinout variant only; not capability or compatibility approval.
Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.
Locator: printed p. 31 (PDF p. 36), section 14.1, J18 52-pin PCI Express MiniCard Signal Name/Function table
M.2 physical fit and keying do not establish whether a host supports a particular SATA, PCIe or NVMe device.
Claim scope: Consumer identification / documented standard or product class only
Source links: S033 · Evidence trail → (private workspace)
Dell’s version-12 article illustrates 2242 as a nominal 22 × 42 mm module and 2280 as a nominal 22 × 80 mm module. These are module-format examples, not socket mating dimensions.
Claim scope: Article 000144170 version 12, Figure 1 examples (b)–(d); no tolerance, connector geometry or clearance inferred.
Source links: S426 · Evidence trail → (private workspace)
ATP distinguishes M.2 keying from the interface actually wired to a socket: a mechanically matching key alone does not establish SATA or PCIe support.
Claim scope: Manufacturer compatibility checklist; no universal B, M or B+M key-to-protocol mapping or numeric contact positions.
Source links: S427 · Evidence trail → (private workspace)
ATP calls for checking module length, mounting position and vertical/component clearance, including single- versus double-sided construction, separately from keying.
Claim scope: Physical fit checklist only; no invented height, tolerance, heat-spreader or fabrication dimensions.
Source links: S427 · Evidence trail → (private workspace)
ATP separates firmware support for NVMe boot from mechanical fit and advises against treating ordinary M.2 installation as hot-plugging. Follow the exact equipment’s power-off and service instructions.
Claim scope: No claim that every NVMe-capable host can boot every drive; external USB removal is a different operation.
Source links: S427 · Evidence trail → (private workspace)
The ASUS PRIME B550-PLUS AC-HES manual lists M.2_1 with SATA and PCIe x4 modes: PCIe 4.0 for the named Ryzen 5000/3000 desktop families, and PCIe 3.0 for the named 5000 G-Series/4000 G-Series families.
Claim scope: E18712 First Edition, printed vii. Only the manual’s named processor families and M.2_1 slot; actual CPU and firmware still require verification.
Source links: S429 · Evidence trail → (private workspace)
On the same AC-HES board, the chipset-connected M.2_2 is specified for PCIe 3.0 x4 and SATA; both M.2 slot entries list 2242, 2260, 2280 and 22110 modules.
Claim scope: E18712 printed vii, exact board and slot labels; supported nominal lengths do not establish component clearance or boot qualification.
Source links: S429 · Evidence trail → (private workspace)
StarTech SM2NGFFMBU33 explicitly excludes M.2 NVMe and AHCI PCI-Express SSDs.
Claim scope: Named SATA-only USB enclosure; the M.2 label or an apparently matching key cannot override this exclusion.
Source links: S491 · Evidence trail → (private workspace)
The SM2NGFFMBU33 sheet lists SATA B-key and SATA B+M-key M.2 drive types.
Claim scope: Named enclosure drive-type list only. Its inconsistent module-length lists are held open, not treated as confirmed 2230 support.
Source links: S491 · Evidence trail → (private workspace)
In TE drawing C-2199230 revision B4, the representative shown as 1-2199230-5 is an M-key board socket; the card edge is its counterpart, not the illustrated component.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S594 · Evidence trail → (private workspace)
The C-2199230 part table separates A, B, E and M key variants, and the M-key block includes several part suffixes rather than one universal socket.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S594 · Evidence trail → (private workspace)
The C-2199230 drawing specifies 67 contact positions with a key interruption; its two solder-tail rows have different counts, so a single visible row is not the total contact inventory.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S594 · Evidence trail → (private workspace)
Kingston states that a PCIe M.2 SSD in a SATA-only host socket—or a SATA M.2 SSD in a PCIe-only socket—does not gain the missing protocol merely from physical fit. Consult the system manual for the exact slot interface and any shared-lane restrictions.
Claim scope: Storage SSD interface only; not a claim about every M.2 socket or PCIe adapter
Source links: S033 · Evidence trail → (private workspace)
TE Connectivity product 1759513-1 is described as a 52-position, 0.8 mm centerline board-to-board connector for Mini PCI Express and mSATA.
Claim scope: V50 identification fact only; no wiring, protocol compatibility, installation or fabrication approval is inferred.
Source links: S339 · Evidence trail → (private workspace)
Molex’s cited Mini PCI Express connector drawing identifies 52 circuits at 0.8 mm pitch and shows odd-numbered positions on one card side and even-numbered positions on the other.
Claim scope: Numbering/orientation context for the cited connector example only; no Mini PCIe or mSATA signal assignment is normalized.
Source links: S358 · Evidence trail → (private workspace)
Kingston distinguishes M.2 from mSATA: mSATA uses SATA, while M.2 includes SATA and PCIe options and does not use the same physical connector. A shared Mini PCIe/mSATA socket outline still does not establish the host’s wired interface.
Claim scope: Kingston SSD FAQ reinspection on 8 October 2026 plus the existing TE 52-position socket example; inherited source dates unchanged. Not a universal Mini PCIe/mSATA host compatibility result.
Source links: S033 · S339 · Evidence trail → (private workspace)
TE drawing C-1759513 revision E2 supplies separate Mini PCI Express and mSATA signal-assignment tables for the socket family; one housing does not imply one interface assignment.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S595 · Evidence trail → (private workspace)
The socket views in C-1759513 show two contact rows interrupted by an offset key, with short and long contact banks; the study is of the board socket, not a miniature M.2 module.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S595 · Evidence trail → (private workspace)
C-1759513 sheet 2 separates half-size and full-size card mounting keepouts, so the socket alone does not describe the complete module-retention arrangement.
Claim scope: V143: the named drawing/revision or exact product page only. Recognition and document-role evidence; not a pinout, adapter verdict, dimensioned mating gauge, electrical approval or current installed-device claim.
Source links: S595 · Evidence trail → (private workspace)
EKF S82-P6 NVMe PCIe x4 M-Key socket: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S711 · Evidence trail → (private workspace)
Transcend MTS400 B+M-key SATA SSD: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S712 · Evidence trail → (private workspace)
Kontron KWS 3000-ADL M-key NVMe socket (PCIe x4): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S713 · Evidence trail → (private workspace)
Apacer SV250-M242 B+M SATA module: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S714 · Evidence trail → (private workspace)
Advantech TPC-XX51T/H-E MINIPCIE socket: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S831 · Evidence trail → (private workspace)
Transcend MSA370 mSATA SSD: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S832 · Evidence trail → (private workspace)
Kontron JRexplus-DC J18 Mini PCI Express + USB: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S833 · Evidence trail → (private workspace)
Transcend MSA370 mSATA module: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.
Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.
Source links: S832 · Evidence trail → (private workspace)
Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.
