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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 ...
SSD benchmark, showing about 230 MB/s reading speed (blue), 210 MB/s writing speed (red) and about 0.1 ms seek time (green), all independent from the accessed disk location Traditional HDD benchmarks tend to focus on the performance characteristics such as rotational latency and seek time .
8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.
[1] [2] By contrast, software is a set of written instructions that can be stored and run by hardware. Hardware derived its name from the fact it is hard or rigid with respect to changes, whereas software is soft because it is easy to change. Hardware is typically directed by the software to execute any command or instruction.
[1] As a family of form factors, it defines specifications for the mechanical dimensions and electrical interfaces devices should have, to ensure compatibility between disparate hardware manufacturers. The standard is meant to replace the U.2 form factors for drives used in data centers. [1] EDSFF provides a pure NVMe over PCIe interface. One ...
An Intel X25-M SSD Intel P3608 NVMe flash SSD, PCI-E add-in card An Intel mSATA SSD. On September 8, 2008, Intel began shipping its first mainstream solid-state drives (SSDs), the X18-M and X25-M with 80 GB and 160 GB storage capacities. [1] Reviews measured high performance with these MLC-based drives.
[11] 8-inch floppy disks were commercially introduced in 1971 by IBM, [12] with them being compacted to 5 + 1 ⁄ 4-inch by Shugart Associates in 1976. [13] At the same time Compact Cassettes started being used to store data, being popular in the late 1970s and 1980s for holding data for personal computers . [ 14 ]
1 GiB of SDRAM mounted in a computer. An example of primary storage. 15 GB PATA hard disk drive (HDD) from 1999. When connected to a computer it serves as secondary storage. 160 GB SDLT tape cartridge, an example of off-line storage. When used within a robotic tape library, it is classified as tertiary storage instead.