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SATA Express host-side connector, formally known as the "host plug", accepts both SATA Express and legacy standard SATA data cables. [13] [31]Connectors used for SATA Express were selected specifically to ensure backward compatibility with legacy SATA devices where possible, without the need for additional adapters or converters. [2]
The SATA M.2 standard is a small form factor implementation of the SATA Express interface, with the addition of an internal USB 3.0 port; see the M.2 (NGFF) section below for a more detailed summary. [35] microSSD introduces a ball grid array electrical interface for miniaturized, embedded SATA storage. [36]
The specification was released on December 20, 2011, as a mechanism for providing PCI Express connections to SSDs for the enterprise market. Goals included being usable in existing 2.5" and 3.5" form factors, to be hot swappable and to allow legacy SAS and SATA drives to be mixed using the same connector family. [2]
SATA Express allows the use of two PCI Express 2.0 or 3.0 lanes and two SATA 3.0 (6 Gbit/s) ports through the same host-side SATA Express connector (but not both at the same time). SATA Express supports NVMe as the logical device interface for attached PCI Express storage devices.
For instance, SATA revision 3.0 (6 Gbit/s) controllers on one PCI Express 2.0 (5 Gbit/s) channel will be limited to the 5 Gbit/s rate and have to employ more channels to get around this problem. Early implementations of new protocols very often have this kind of problem.
The SAS is a new generation serial communication protocol for devices designed to allow for much higher speed data transfers and is compatible with SATA. SAS uses a mechanically identical data and power connector to standard 3.5-inch SATA1/SATA2 HDDs, and many server-oriented SAS RAID controllers are also capable of addressing SATA hard drives.
PCI Express ×8 port, single 32-bit 33 MHz PCI bus, DMI for ICH7 ICH7 3010: Mukilteo-2P PCI Express 1 ×16 or 2 ×8 ports, single 32-bit 33 MHz PCI bus, DMI for ICH7 3200: Bigby-V 800 or 1066 or 1333 MT/s Two channels of ECC DDR2-667 or DDR2-800 PCI Express ×8 port, single 32-bit 33 MHz PCI bus, DMI for ICH9 ICH9 3210: Bigby-P
SATA Express and M.2 are also supported, providing the ability for interfacing with PCI Express-based storage devices. Each of the X99's SATA Express ports requires two PCI Express 2.0 lanes provided by the chipset, while the M.2 slots can use either two 2.0 lanes from the chipset itself, or up to four 3.0 lanes taken directly from the processor.