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A solid-state drive (SSD) is a type of solid-state storage device that uses integrated circuits to store data persistently. It is sometimes called semiconductor storage device, solid-state device, or solid-state disk. [1] [2] SSDs rely on non-volatile memory, typically NAND flash, to store data in memory cells. The performance and endurance of ...
550 MB/s sequential read, 520 MB/s sequential write on 256 GB and larger models 550 MB/s sequential read, 470 MB/s sequential write on 128 GB model [18] Virident Systems tachIOn SSD Up to [neutrality is disputed] 320,000 sustained READ IOPS using 4 kB blocks, and up to 200,000 sustained WRITE IOPS using 4kB blocks [19] PCIe OCZ RevoDrive 3 X2 SSD
A 500 GB Western Digital hard disk drive with a 16 MB buffer. In computer storage, a disk buffer (often ambiguously called a disk cache or a cache buffer) is the embedded memory in a hard disk drive (HDD) or solid-state drive (SSD) acting as a buffer between the rest of the computer and the physical hard disk platter or flash memory that is ...
Some drives(2.5" 500 GB and 1 TB, 3.5" 2 TB) has 5400 RPM and 7200 RPM variant every other with higher capacity has 5400 RPM and 3.5" 1 TB and (canceled) 500 GB were available only in 7200 RPM . All 2.5" have 128 MB cache size, 3.5" mostly have 256 MB with two exceptions 1 TB(64 MB cache) and 500 GB(32 MB cache).
Therefore, one gigabyte is one billion bytes. The unit symbol for the gigabyte is GB. This definition is used in all contexts of science (especially data science), engineering, business, and many areas of computing, including storage capacities of hard drives, solid-state drives, and tapes, as well as data transmission speeds.
For example, the first commercial hard drive, IBM's RAMAC in 1957, supplied 3.75 MB for $34,500, or $9,200 per megabyte. In 1989, a 40 MB hard drive cost $1200, or $30/MB. And in 2018, 4 Tb drives sold for $75, or 1.9¢/GB, an improvement of 1.5 million since 1989 and 520 million since the RAMAC.
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