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A USB flash drive consists of flash memory data storage device integrated with a USB. USB flash drives are typically removable and rewritable, much smaller than a floppy disk, and most weigh less than 1 ounce (30 g). Storage capacities can range from 64 MB to 256 GB with steady improvements in size and price per capacity. Some allow 1 million write or erase cycles and have 10-year data retention.USB flash drives are often used for the same purposes as floppy disks were. They are smaller, faster, have thousands of times more capacity, and are more durable and reliable due to their lack of moving parts. Since floppy discs were developed until about 2005 most PC and laptop computers were supplied with floppy disc drives, but most recent equipment has several USB ports but does not support floppy disks.Flash 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 store more data and transfer faster than a much larger optical disc drive and can be read by most other systems such as the Microsoft Xbox 360.
Most USB flash drives derive their power from the USB connection, and do not require a battery.Flash memory combines a number of older technologies, with lower cost, lower power consumption and small size made possible by recent[update] advances in microprocessor technology.The most common use of flash drives is to transport and store personal files such as documents, pictures and videos. Flash drives are particularly popular among system and network administrators, who load them with configuration information and software used for system maintenance, troubleshooting, and recovery. They are also used as a means to transfer recovery and antivirus software to infected PCs, allowing a portion of the host machine's data to be archived. As the drives have increased in storage space, they have also replaced the need to carry a number of CD ROMs and installers which were needed when reinstalling or updating a system.
Here is a great collection of the most unique, unusual and creative flash drives.