It is up to the manufacturer of the.2 host or device to select which interfaces are to be supported, depending on the desired level of host support and device type.
While it can be described as a scaled-down version of PCI Express, mPCIe does have a few differences from its full-size counterpart.
Exposed PCI Express lanes provide a pure PCI Express connection between the host and storage device, with no additional layers of bus abstraction.The similarity of msata and mpcie cards creates a lot of room for confusion.As a result,.2 modules can integrate multiple functions, including the following device classes: Wi-Fi, Bluetooth, satellite navigation, near field communication (NFC digital radio, Wireless Gigabit Alliance (WiGig wireless WAN (wwan and solid-state drives (SSDs)."sata Express: PCIe Client Storage" (PDF).1 :14 It supports both legacy sata and PCI Express storage devices, with ahci and NVMe as the logical device interfaces.The.2 connector has different keying notches that denote various purposes and capabilities.2 hosts and modules, preventing plugging.2 modules into feature-incompatible host connectors.While the support for ahci ensures software-level backward compatibility with legacy sata devices and legacy operating systems, NVM Express is designed to fully utilize the capability of high-speed PCI Express storage devices to perform many.Most folks are familiar with the full-size USB ports and PCI Express slots found in desktop machines, but portable computers (and a few others, including my iMac) need something more compact.
Similar keying applies.2 modules that utilize provided USB.0 connectivity.
Emerging on the market in 2010, msata SSDs quickly took off, being that its based on an existing and widespread storage interface.
A b c Mark Kyrnin.
"Serial ATA Revision.2 (Gold Revision (PDF).
1 :20,.2 modules are rectangular, with an edge connector on one side (75 positions with up to 67 pins,.5 mm pitch, pins on opposing sides of the PCB are offset from each other and a semicircular mounting hole at the center of the opposite.A b c d e f g h "M.2 (ngff) Quick Reference Guide" (PDF).Les Tokar (November 24, 2013).Different host-side connectors are used for single- and double-sided.2 modules, providing different amounts of space between the.2 expansion card and the host's PCB.Instead of PCIs parallel bus architecture, PCI Express leverages point-to-point topology."Intel SSD 530 Series Arriving Next Week Feature ngff.2 Interface".Wu, Director of Embedded Flash Div.The socket is keyed in the M position and provides two positions for the mounting screw, accepting 22izes.2 modules.
A wide variety of options are available but, as with ExpressCards, caution is in order since not all are equal.