It means that the moving parts of the hard disk are reading your data. And often, you can hear a clicking sound when the computer is working. It writes and reads data using the moving parts only when the computer is on. For example, the computer hard disk drive takes advantage of volatile memory.

Volatile memory is temporary data storage. There are 2 types of memory being designed to save and store data on different devices, respectively volatile and non-volatile. Thanks to their universal serial bus (USB) port compatibility. Whatever the name, they all share one important characteristic, they can be hooked up to any computer. That is why some people know them as pen drives, while others prefer to call them 'thumb drives'.

These storage devices have been designed to be smaller than a typical storage disk, with some being the size of a thumb. USB flash drive also called a thumb drive, jump drive, pen drive and USB memory stick is a device that can be used to save information on a tiny flash memory chip.