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2. Solid-state drive - Wikipedia

   en.wikipedia.org/wiki/Solid-state_drive

   Comparison of NAND-based SSD and HDD Attribute or characteristic Solid-state drive (SSD) Hard disk drive (HDD) Price per capacity SSDs are generally more expensive than HDDs and are expected to remain so. As of early 2018, SSD prices were around $0.30 per gigabyte for 4 TB models. [23]

3. vRPM - Wikipedia

   en.wikipedia.org/wiki/VRPM

   vRPM, or virtual Revolutions Per Minute, was a term for a synthetic measurement of performance introduced by SanDisk for solid state drive (SSD) storage devices inside client PCs. vRPM was created to give users a metric to compare SSD performance to the hard disk drive (HDD) and other SSDs.

4. External storage - Wikipedia

   en.wikipedia.org/wiki/External_storage

   Compared to hard disk drives and similar electromechanical disk storage that use moving physical parts to spin a platter or disc, SSDs are typically more compact, quieter, more resistant to physical shock, and have higher input/output rates, lower latency [13] and less power consumption.

5. Density (computer storage) - Wikipedia

   en.wikipedia.org/wiki/Density_(computer_storage)

   Hard disk drives store data in the magnetic polarization of small patches of the surface coating on a disk. The maximum areal density is defined by the size of the magnetic particles in the surface, as well as the size of the "head" used to read and write the data. In 1956 the first hard drive, the IBM 350, had an areal density of 2,000 bit/in 2.

6. Solid-state storage - Wikipedia

   en.wikipedia.org/wiki/Solid-state_storage

   An SSD, in form of a 2.5-inch bay device that uses Serial ATA (SATA) interface Internals of an SD card , showing the flash memory and controller integrated circuits A solid-state drive (SSD) provides secondary storage for relatively complex systems including personal computers , embedded systems , portable devices , large servers and network ...

7. IOPS - Wikipedia

   en.wikipedia.org/wiki/IOPS

   Input/output operations per second (IOPS, pronounced eye-ops) is an input/output performance measurement used to characterize computer storage devices like hard disk drives (HDD), solid state drives (SSD), and storage area networks (SAN).