Serial ATA (SATA) technology was introduced back in 2000 as an improvement to the existing Parallel ATA technology, which was hampered by cable size, cost, performance and functionality. Both technologies were sufficient for hard disk drives (HDDs), which were substantially less capable than today’s solid-state drives (SSDs). The advent of SATA-based SSDs demonstrated that the ATA bus had reached its performance limit. Where HDDs were only able to achieve 50-120 MB/s in write performance, SSDs could saturate the SATA bus at 550 MB/s. In spite of the bus limitation, it’s common to see an overall system performance improvement of 10-15 times when using SATA-based SSDs in place of legacy HDD technology. Learn more here http://c887487260lfw.scd.wezhan.cn/newsinfo/1491892.html
M.2 not only supports SATA, but also PCIe (Peripheral Component Interconnect Express), although not at the same time in a given M.2 SSD. It even supports USB 3.0, Bluetooth, Wi-Fi and Near-Field Communication (NFC) in certain configurations. Upon closer examination of an M.2 module, users may notice that there are notches, or keys, where the connector pins are located, yielding asymmetrical pin configurations. These determine which interface the M.2 module uses and the bus (PCIe, USB 3.0, etc.) that it can connect to. It’s also a design that prevents slotting an M.2 card into an incompatible interface or placing it in a reverse configuration. M.2 SSDs are capable of attaining high data transfer speeds, but it all hinges on the type of storage interface used. A SATA-based M.2 SSD is limited by SATA’s maximum limit of 600 MB/s (megabytes per second). An M.2 SSD that supports PCIe enables it to use NVMe (Non-Volatile Memory Express), a low-latency host controller interface specification t...
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