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By PURPLELEC | 16 January 2025 | 0 Comments

M.2 SSD Full Analysis: In-depth understanding from size to interface technology

  M.2 is a form factor specification introduced in 2012 to replace the mSATA standard, which specifies the physical size and shape of SSD cards that can be connected to the system. This form factor specification is designed to maximize the use of PCB (printed circuit board) space while reducing the space occupied in the PC or laptop. To connect an M.2 SSD, the motherboard needs to be equipped with an M.2 slot.
  M.2 SSD is a solid-state drive that uses the M.2 form factor. Its small appearance is similar to a rectangular card. It is faster and more compact than traditional hard drives. It is ideal for laptops and desktops where space is limited and speed is critical. The M.2 size is small, almost like a piece of chewing gum. The width is usually 22 mm, but the length varies. The motherboard will adapt to the various lengths of M.2 modules for flexibility. When purchasing, such as the Crucial T500, the "M.2 2280" in the title means that its size is 22 mm wide and 80 mm long, which helps with purchasing.
NVME Sata M.2 SSD
  In M.2 SSD, there are two interface technologies: SATA and NVMe. M.2 SATA SSDs use the SATA interface, a widely used standard in storage devices, and typically reach speeds of about 550-600 MB/s, limited by the bandwidth of the SATA interface. M.2 NVMe SSDs, on the other hand, utilize the PCIe interface designed specifically for solid-state storage, and typically reach read and write speeds of over 5000 MB/s, and even up to 14,500 MB/s like the Crucial T705, for faster performance. The speed advantage of M.2 NVMe SSDs is particularly evident in demanding tasks such as gaming, content creation, and professional workloads.
  SATA, which stands for Serial Advanced Technology Attachment, is an interface used to connect storage devices such as hard drives and solid-state drives, with advantages such as smaller cables, lower costs, and faster data transfer speeds. PCIe (Peripheral Component Interconnect Express) is a newer interface that physically takes up less space and is able to transfer data on up to four channels at a faster speed than SATA. When used in conjunction with an NVMe SSD, the read/write speeds of PCIe SSDs are further improved.
  NVMe (NVM Express™, or Non-Volatile Memory Express) is a communication protocol specifically designed to work with flash memory over the PCIe interface, enabling unparalleled read and write speeds. Compared to older protocols, NVMe uses an optimized path to issue commands and complete input/output, supports parallel operations, up to 64,000 commands in a single I/O queue, and 64,000 possible queues, resulting in improved performance.
  When choosing an SSD, compatibility with your computer is the most important factor in choosing an SSD interface. If there are multiple M.2 slots to choose from on your motherboard, at least one of which supports PCIe, it's worth considering upgrading the second slot to an SSD for faster read and write speeds. Check your computer specifications to see which interface is supported, or use the Upgrade Selector™ or System Scanner to find compatible parts.

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