USB mean is "Universal Serial Bus."
Yes, USB key and flash are just different words for it
A keyboard which is connected to the computer by use of a USB cable
If you have special software when you insert your usb key to Mac it allows you to access. Or yiou can actually protect you Mac with password(+usb key). If you are intrested in soft - ProteMac Logon Key is only i know. http://www.protemac.com/logonkey/
a flash drive or pen drive, or possibly a USB key
A USB key is a data storage device that can easily be plugged into devices such as computers and tablets in order to transfer and store data. A secure USB key has special encryption software so that other people cannot look at your data without your authorisation.
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Your mp3 should have a USB key on it. Just plug it into your computer's USB port.
stored on USB
no you shove it up you ***
yes
To download your photo albums from Bebo to a USB key, first, log into your Bebo account and navigate to your albums. Download each photo individually by right-clicking on the images and selecting "Save As," then choose a folder on your computer. Once all images are downloaded, plug in your USB key, open its folder, and copy the downloaded photos into it. Safely eject the USB key once the transfer is complete.
The USB disk security is a well known software for protecting your system from USB based malwares/threats.