USB Flash drives

A USB flash drive consists of a NAND-type flash memory data storage
device integrated with a USB (universal serial bus) interface. USB flash
drives are typically removable and rewritable, much smaller than a floppy
disk (1 to 4 inches or 2.5 to 10 cm), and most USB flash drives weigh
less than an ounce (28g).[1] Storage capacities typically range from 64
MB to 128 GB[2] with steady improvements in size and price per gigabyte.
Some allow 1 million write or erase cycles[3][4] and have 10-year data
retention,[5] connected by USB 1.1 or USB 2.0.

USB flash drives offer potential advantages over other portable storage
devices, particularly the floppy disk. They have a more compact shape,
operate faster, hold much more data, have a more durable design, and
operate more reliably due to their lack of moving parts. Additionally, it
has become increasingly common for computers to be sold without floppy
disk drives. USB ports, on the other hand, appear on almost every
current[update] mainstream PC and laptop. These types of drives use the
USB mass storage standard, supported natively by modern operating systems
such as Windows, Mac OS X, Linux, and other Unix-like systems. USB drives
with USB 2.0 support can also operate faster than an optical disc drive,
while storing a larger amount of data in a much smaller space.