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Solid state hard drive (SSD)

A solid-state drive ( SSD , also known as a solid-state disk is a solid-state storage device that uses integrated circuit assemblies as memory to store data persistently .
SSD technology primarily uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives (HDDs), which permit simple replacements in common applications.
 @Intel

Additionally, new I/O interfaces, like SATA Express and M.2 have been designed to address specific requirements of the SSD technology.
SSDs have no moving mechanical components. This distinguishes them from traditional
electromechanical magnetic disks such as hard disk drives (HDDs) or floppy disks, which contain spinning disks and movable read/write heads .

Compared with electromechanical disks, SSDs are typically more resistant to physical shock, run silently, have lower access time , and lower latency . However, while the price of SSDs has continued to decline over time
As of 2015, most SSDs use MLC NAND-based flash memory, which is a type of non-volatile memory that retains data when power is lost. For applications requiring fast access but not necessarily data persistence after power loss, SSDs may be constructed from random-access memory (RAM). Such devices may employ batteries as integrated power sources to retain data for a certain amount of time after external power is lost.
Hybrid drives or solid-state hybrid drives (SSHDs) combine the features of SSDs and HDDs in the same unit, containing a large hard disk drive and an SSD cache to improve performance of frequently accessed data.


The fun part

Seagate introduced a 60 TB 12 Gb/s dual port SAS SSD in a 3.5-inch form factor as well as an 8 TB Nytro XP7200 NVMe SSD. 

This 60 TB SSD is the largest storage media around, exceeding 10 TB HDDs and magnetic tapes as well as 16 TB SSD introduced before the 2016 FMS. Seagate hinted that the capacity of this form factor SSD could grow even more in the future to provide 100 TB or more of data in the future.

Samsung also introduced their 32 TB 2.5-inch form factor SAS SSD (PM1643), which the company said would be produced in 2017. Samsung also hinted that 100 TB SSDs in this form factor could be possible by 2020. 


Research  articles: wikipedia ,forbes

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