USB Flash drives combine "flash" memory with a USB connection, so that they can be plugged into any computer USB port.
Being backwardly-compatible, any of our USB drives will fit any computer with a USB 1.1 connection or later. This is just about any computer made in the last 6 or 7 years.
The most popular USB drive is between 512MB to 2GB. The cost of these drives have come down by over 60% in the last 2 years. As a result, the 128MB and 256MB have almost become redundant because you can buy 512MB and 1GB for almost the same price.
There are hundreds of styles that are available. For convenience and ease of browsing, the USB Direct website lists the top 10 flash drives in order of popularity. For your information, you will find that often the most popular styles are slightly cheaper because of the economies of scale that is achieved through sheer volume.
The number of USB devices in 2004 was over 1 billion. In 2008, this figure exceeds 10 billion.
The design of USBs is standardised so all computers use the same connection. The computer manufacturers and users such as Hewlett Packard, NEC Apple, Agere and Microsoft are all members of the USB Implementers Forum (USB-IF) so that universality is virtually guaranteed.
It is expected that very soon almost all connections of your computer will be USB drives. Floppy disc drives are redundant and CDs will be too.