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In comparison to hard disk drives and similar electromechanical media which use moving parts, SSDs are typically more resistant to physical shock, run silently, and have higher input/output rates and lower latency.[5] SSDs store data in semiconductor cells. As of 2019,[update] cells can contain between 1 and 4 bits of data. SSD storage devices vary in their properties according to the number of bits stored in each cell, with single-bit cells ("Single Level Cells" or "SLC") being generally the most reliable, durable, fast, and expensive type, compared with 2- and 3-bit cells ("Multi-Level Cells/MLC" and "Triple-Level Cells/TLC"), and finally quad-bit cells ("QLC") being used for consumer devices that do not require such extreme properties and are the cheapest per gigabyte (GB) of the four. In addition, 3D XPoint memory (sold by Intel under the Optane brand) stores data by changing the electrical resistance of cells instead of storing electrical charges in cells, and SSDs made from RAM can be used for high speed, when data persistence after power loss is not required, or may use battery power to retain data when its usual power source is unavailable.[6] Hybrid drives or solid-state hybrid drives (SSHDs), such as Intel's Hystor[7] and Apple's Fusion Drive, combine features of SSDs and HDDs in the same unit using both flash memory and spinning magnetic disks in order to improve the performance of frequently-accessed data.[8][9][10] Bcache achieves a similar effect purely in software, using combinations of dedicated regular SSDs and HDDs.
SSDs based on NAND flash will slowly leak charge over time if left for long periods without power. This causes worn-out drives (that have exceeded their endurance rating) to start losing data typically after one year (if stored at 30 C) to two years (at 25 C) in storage; for new drives it takes longer.[11] Therefore, SSDs are not suitable for archival storage. 3D XPoint is a possible exception to this rule; it is a relatively new technology with unknown long-term data-retention characteristics
The basis for flash-based SSDs, flash memory, was invented by Fujio Masuoka at Toshiba in 1980[38] and commercialized by Toshiba in 1987.[39][40] SanDisk Corporation (then SanDisk) founders Eli Harari and Sanjay Mehrotra, along with Robert D. Norman, saw the potential of flash memory as an alternative to existing hard drives, and filed a patent for a flash-based SSD in 1989.[41] The first commercial flash-based SSD was shipped by SanDisk in 1991.[38] It was a 20 MB SSD in a PCMCIA configuration, and sold OEM for around $1,000 and was used by IBM in a ThinkPad laptop.[42] In 1998, SanDisk introduced SSDs in 2.5-inch and 3.5-inch form factors with PATA interfaces.[43]
In 1995, M-Systems introduced flash-based solid-state drives[45] as HDD replacements for the military and aerospace industries, as well as for other mission-critical applications. These applications require the SSD's ability to withstand extreme shock, vibration, and temperature ranges.[46]
In 1999, BiTMICRO made a number of introductions and announcements about flash-based SSDs, including an 18 GB[47] 3.5-inch SSD.[48] In 2007, Fusion-io announced a PCIe-based Solid state drive with 100,000 input/output operations per second (IOPS) of performance in a single card, with capacities up to 320 GB.[49]
In 2016, Seagate demonstrated 10 GB/s sequential read and write speeds from a 16-lane PCIe 3.0 SSD, and a 60 TB SSD in a 3.5-inch form factor. Samsung also launched to market a 15.36 TB SSD with a price tag of US$10,000 using a SAS interface, using a 2.5-inch form factor but with the thickness of 3.5-inch drives. This was the first time a commercially available SSD had more capacity than the largest currently available HDD.[53][54][55][56][57]
In 2018, both Samsung and Toshiba launched 30.72 TB SSDs using the same 2.5-inch form factor but with 3.5-inch drive thickness using a SAS interface. Nimbus Data announced and reportedly shipped 100 TB drives using a SATA interface, a capacity HDDs are not expected to reach until 2025. Samsung introduced an M.2 NVMe SSD with read speeds of 3.5 GB/s and write speeds of 3.3 GB/s.[58][59][60][61][62][63][64] A new version of the 100 TB SSD was launched in 2020 at a price of US$40,000, with the 50 TB version costing US$12,500.[65][66]
Enterprise flash drives (EFDs) are designed for applications requiring high I/O performance (IOPS), reliability, energy efficiency and, more recently, consistent performance. In most cases, an EFD is an SSD with a higher set of specifications, compared with SSDs that would typically be used in notebook computers. The term was first used by EMC in January 2008, to identify SSD manufacturers who would provide products meeting these higher standards.[72] There are no standards bodies who control the definition of EFDs, so any SSD manufacturer may claim to produce EFDs when in fact the product may not meet any particular requirements.[73]
Another example is the Toshiba PX02SS enterprise SSD series announced in 2016, optimized for use in server and storage platforms requiring high endurance from write-intensive applications such as write caching, I/O acceleration, and online transaction processing (OLTP). The PX02SS series uses 12 Gbit/s SAS interface, featuring MLC NAND flash memory and achieving random write speeds of up to 42,000 IOPS, random read speeds of up to 130,000 IOPS, and endurance rating of 30 drive writes per day (DWPD).[75]
Lower-priced drives usually use quad-level cell (QLC), triple-level cell (TLC) or multi-level cell (MLC) flash memory, which is slower and less reliable than single-level cell (SLC) flash memory.[93][94] This can be mitigated or even reversed by the internal design structure of the SSD, such as interleaving, changes to writing algorithms,[94] and higher over-provisioning (more excess capacity) with which the wear-leveling algorithms can work.[95][96][97]
DRAM-based SSDs usually incorporate either an internal battery or an external AC/DC adapter and backup storage systems to ensure data persistence while no power is being supplied to the drive from external sources. If power is lost, the battery provides power while all information is copied from random access memory (RAM) to back-up storage. When the power is restored, the information is copied back to the RAM from the back-up storage, and the SSD resumes normal operation (similar to the hibernate function used in modern operating systems).[99][100]
In 2015, Intel and Micron announced 3D XPoint as a new non-volatile memory technology.[106] Intel released the first 3D XPoint-based drive (branded as Intel Optane SSD) in March 2017 starting with a data center product, Intel Optane SSD DC P4800X Series, and following with the client version, Intel Optane SSD 900P Series, in October 2017. Both products operate faster and with higher endurance than NAND-based SSDs, while the areal density is comparable at 128 gigabits per chip.[107][108][109][110] For the price per bit, 3D XPoint is more expensive than NAND, but cheaper than DRAM.[111][self-published source?]
Drives known as hybrid drives or solid-state hybrid drives (SSHDs) use a hybrid of spinning disks and flash memory.[114][115] Some SSDs use magnetoresistive random-access memory (MRAM) for storing data.[116][117] 2ff7e9595c
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