Within the Second Generation USB (Universal Serial Bus) devices, there is connectivity with USB 2.0. However, do not use the full bandwidth of 480 Mbit / s that supports USB 2.0 Specification Hi-Speed due to technical limitations of the NAND based flash memory. The fastest devices of this generation use a dual channel controller, although they are still far from the possible transfer rate of a hard disk of the current generation, or the maximum high speed USB performance.
The file transfer speeds vary considerably. The units are typically capable of fast read speeds of up to 30 Mbit / s and write at about half that speed. This is about 20 times faster than USB 1.1 devices, which have a maximum speed of 12 Mbit / s.
The standard USB 3.0 provides greatly improved data transfer rates compared to its predecessor, plus support for USB 2.0 ports. The USB 3.0 standard was announced in late 2008, but consumer devices were not available until early 2010. The USB 3.0 interface specifies transfer rates up to 5 Gbit / s, compared to 40 Mbit / s for USB 2.0.
Even though USB 3.0 interface allows extremely high data rates transfer from 2011 most USB 3.0 Flash drives do not use all the speed of USB 3.0 interface due to limitations of their memory controllers. Although some memory channel controllers coming into market solve this problem.
Some of these memories store up to 256 MiB of memory (which is 1024 times the initial design of M-Systems). There are also devices, which apart from their normal function, have a USB memory as attachment included, as some wireless optical mouse or USB Memory with attachment to recognize other types of memory (microSD, m2, etc..).
In August 2010, Imation announces the launch of the new line of security USB Flash Drive Defender F200, with capacities of 1 GiB, 2 GiB, 4 GiB, 8 MiB, 16 MiB and 32 MiB. These storage units have a biometric sensor based ergonomic hardware that validates fingerprint matching identification before allowing access to information.