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Nowadays, most external devices are conveniently connected to a computer using the USB ports.eg USB keyboard,USB mouse,memory stick,external harddisk,USB modem,flash disk,playstation devices etc. Some USB devices like flash drives should only be removed after stopping it, otherwise the USB device may be damaged and data lost.

Though DVD/CDs as a data storage media are more reliable than floppy and Flash disks, they are also prone to errors. Errors reading the DVD/CD can be due to problems with DVD/CD or the computer DVD/CD-ROM drive