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4 Technical details. ... USB flash drive: Various USB 1.1/2.0/3.0/3.1 ... This table does not take into account protocol issues in communicating with the device.
The Introduction of FCM2 was the industry's largest capacity enterprise SSD as well as the first enterprise SSD to offer exclusively QLC NAND Flash! [12] [13] FCM3.0 - U.2 NVMe PCIe gen 3 and gen 4, hybrid SLC-QLC NAND Flash, available in 4 capacities, 4.8TBu / 21.99TBe, 9.6TBu / 28.8 TBe, 19.2TBu / 57.6TBe, and 38.4TBu / 115.2TBe [14]
A flash drive (also thumb drive, memory stick, and pen drive/pendrive) [1] [note 1] is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable, and smaller than an optical disc , and usually weighs less than 30 g (1 oz).
Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB 2.0 flash drives but are equal to or slower than USB 3.0 and Firewire (IEEE 1394) for sequential data. USB 2.0 and faster flash drives have faster random access times: typically around 1 ms, compared to 12 ms for mainstream desktop hard drives.
The CFast 2.0 specification was released in the second quarter of 2012, updating the electrical interface to SATA 3.0 (600 MB/s). As of 2014, the only product employing CFast 2.0 cards was the Arri Amira digital production camera, [ 44 ] allowing frame rates of up to 200 fps; a CFast 2.0 adapter for the Arri Alexa/XT camera was also released.
USB 3.0 SuperSpeed and USB 2.0 High-Speed versions defined USB 3.0 SuperSpeed – host controller (xHCI) hardware support, no software overhead for out-of-order commands; USB 2.0 High-speed – enables command queuing in USB 2.0 drives; Streams were added to the USB 3.0 SuperSpeed protocol for supporting UAS out-of-order completions
Flash memory devices impose no seek latency. Wear leveling: flash memory devices tend to wear out when a single block is repeatedly overwritten; flash file systems are designed to spread out writes evenly. Log-structured file systems have all the desirable properties for a flash file system. [1] Such file systems include JFFS2 and YAFFS.
Flash-based storage does not suffer the limitation of a battery, but RAM-backed storage is faster and does not experience write amplification. [3] [8] [9] As a result of having no moving mechanical parts, solid-state storage has no data access latency required to move the media as in an electromechanical storage device.