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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.An early if not first semiconductor storage device compatible with a hard drive interface (e.g. The Storage Tek 4305, a plug-compatible replacement for the IBM 2305 fixed head disk drive, initially used charged coupled devices for storage and consequently was reported to be seven times faster than the IBM product at about half the price.) products sold as alternatives to HDDs but these products typically had memory interfaces and were not SSDs as defined.Such devices may employ batteries as integrated power sources to retain data for a certain amount of time after external power is lost.However, all SSDs still store data in electrical charges, which slowly leaks over time if left without power.New I/O interfaces like SATA Express and M.2 have been designed to address specific requirements of the SSD technology. 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., most SSDs use 3D TLC NAND-based flash memory, which is a type of non-volatile memory that retains data when power is lost.
It achieved a maximum write speed of 654 megabytes per second (MB/s) and maximum read speed of 712 MB/s.The term was first used by EMC in January 2008, to help them identify SSD manufacturers who would provide products meeting these higher standards.An example is the Intel DC S3700 series of drives, introduced in the fourth quarter of 2012, which focuses on achieving consistent performance, an area that had previously not received much attention but which Intel claimed was important for the enterprise market.Micron and Intel initially made faster SSDs by implementing data striping (similar to RAID 0) and interleaving in their architecture.This enabled the creation of ultra-fast SSDs with 250 MB/s effective read/write speeds with the SATA 3 Gbit/s interface in 2009.