Talk:M.2
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Latest comment: 3 years ago by 174.28.55.191 in topic Screws to secure M.2 cards
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To-do list
edit- What is the relation between "gum stick" SSDs used in, for example, MacBook Air — and the NGFF / M.2 SATA SSDs? Dsimic (talk) 14:26, 14 September 2013 (UTC)
- "Gum stick" SSDs are proprietary (not standardized like M.2) — Preceding unsigned comment added by 192.55.55.39 (talk) 17:25, 14 July 2015 (UTC)
- What kind of interface do they use, both bus-wise and at the logical level? — Dsimic (talk | contribs) 20:51, 14 July 2015 (UTC)
- "Gum stick" SSDs are proprietary (not standardized like M.2) — Preceding unsigned comment added by 192.55.55.39 (talk) 17:25, 14 July 2015 (UTC)
- Some images should be provided for an illustration of different M.2 sizes, and/or for a mSATA vs. M.2 comparison. -- Dsimic (talk) 01:45, 18 September 2013 (UTC)
Are M.2 and M.3 compatible?
editte Could you please add to the article if one could use an M.2 in an M.3 slot and vice versa?--82.37.174.248 (talk) 00:38, 31 December 2018 (UTC)
- M.2 is being updated with PCIE gen 4 inside of it. This maintains compatibilility
- m.3 is an awkward terminology, it was a proposed terminology for the update from PCIe gen 2 to PCIe gen 3, but they haven't bothered. This may be because the CPU may provide PCIE gen 4 and the chipset a lesser PCIe, and also that these are backward compatible in both directions... gen x device to gen y socket, for all x and y, for both PCIe and SATA. They both then talk at the slowest speed. See PCIe and SATA
- So they really want to focus on the form factor and connector being M.2 (mechanically) , and the PCIe/sata version is whatever is lesser of what is connected together.
- I'm not sure this dispute between PCI-SIG and Samsung is worth a small note on the article, but I'd guess not (at the same time, I think it'd be ok to quickly mention it). Feelthhis (talk) 12:10, 6 December 2020 (UTC)
References
- ^ Anandtech
- ^ "M.2 Interoperability Warning" (PDF). Archived (PDF) from the original on 6 December 2020.
M.2 keying table
editThe existing table is somewhat helpful but not intuitive, and is basically a copy of a table in figure 3 of the spec.[1]: 23 I propose a somewhat more complex table that is far more descriptive.
| Key ID | Notched Pins | Primary Interface | Additional Interface Choices | Intended Use[1]: §5 |
|---|---|---|---|---|
| M | 59–66 | PCIe (4 lanes) | SMBus[2] | Solid-state drives |
| SATA | ||||
| B + M | 12–19, 59–66 | PCIe (2 lanes) | ||
| SATA | ||||
| B | 12–19 | SATA | ||
| PCIe (2 lanes) | ||||
| PCIe (2 lanes), USB 2.0, UIM[note 1] | 2nd UIM | Wireless WAN or other (especially future) applications | ||
| Audio, GNSS (I²C) | ||||
| Audio, HSIC (USB 2.0), IPC | ||||
| USB 3.0 or SSIC, USB 2.0, UIM | 2nd UIM | |||
| Audio, GNSS (I2C) | ||||
| Audio, HSIC, IPC | ||||
| A | 8–15 | 2x PCIe[note 2], USB 2.0 | DisplayPort, I2C | Connectivity such as Wi-Fi, Bluetooth, NFC, WiGig, especially for wireless DisplayPort |
| A + E | 8–15, 24–31 | 2x PCIe[note 2], USB 2.0 | I2C | WiFi, BT, NFC, or other connectivity |
| E | 24–31 | 2x PCIe[note 2], SDIO, USB 2.0 | I2C, UART, PCM (I²S) |
- ^ The specification refers to a 'User Identity Module', whose purpose and operation are application dependant. It does however mandate compatibility with ISO/IEC 7816. Thus colloquial SIM cards are compatible, and some of the documentation refers to SIM explicitly.
- ^ a b c 2 separate PCIe interfaces, with 1 lane each. Optionally, can be combined into 1 PCIe interface with 2 lanes.
I'll wait for a week or so before changing the article. Vickas54 (talk) 04:28, 31 May 2021 (UTC)
I completely agree. Besides, the whole article is focused on storage, while M.2 is also used for other purposes. There is a good article, discussing all types of M.2 cards here: https://www.dell.com/support/kbdoc/en-us/000144170/how-to-distinguish-the-differences-between-m-2-cards 213.134.65.133 (talk) 10:38, 2 June 2021 (UTC)
References
- ^ a b c "PCI Express M.2 Specification, Revision 1.0" (PDF). PCI-SIG. November 1, 2013. Archived from the original (PDF) on June 13, 2020.
- ^ "SMBus interface for SSD Socket 2 and Socket 3 (PCI-SIG engineering change notice)" (PDF). PCI-SIG. August 11, 2014. Archived from the original (PDF) on July 14, 2015. Retrieved August 5, 2015.
Screws to secure M.2 cards
editI came here looking for information on the screw needed to secure an M.2 card. They are hard to find. Are they metric M3 threaded screws? Is there a standard size? What does the standard require? 174.28.55.191 (talk) 15:30, 5 July 2021 (UTC)