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They are used to add USB 2.0 ports to a computer that was not originally equipped with them.
A computer's mouse is an external device.
Most models of camcorders come equipped with external microphone inputs.
External storage are computer hardwares that allows you to store files and other computer memorizes outside of the computer. External hard drive is a form of external storage and are generally portable.
Actually, the external hard drive is not located in the computer. It is an external hard drive, which means it is on the outside of the computer. It is plugged into the computer's USB port with a cord.
A computer's mouse is an external device.
The modular kernel approach requires subsystems to interact with each other through carefully constructed interfaces that are typically narrow (in terms of the functionality that is exposed to external modules). The layered kernel approach is similar in that respect. However, the layered kernel imposes a strict ordering of subsystems such that subsystems at the lower layers are not allowed to invoke operations corresponding to the upper layer subsystems. There are no such restrictions in the modular kernel approach, wherein modules are free to invoke each other without any constraints.
The modular kernel approach requires subsystems to interact with each other through carefully constructed interfaces that are typically narrow (in terms of the functionality that is exposed to external modules). The layered kernel approach is similar in that respect. How- ever, the layered kernel imposes a strict ordering of subsystems such that subsystems at the lower layers are not allowed to invoke operations corresponding to the upper-layer subsystems. There are no such restrictions in the modular-kernel approach, wherein modules are free to invoke each other without any constraints.
hardware
A computer external hard drive is a storage device that is connected externally to a computer. It is possible to learn how to install a computer external hard drive though websites such as eHow, or by attending an appropriate college course.
Peripheral equipment is the general term for external equipment used with a computer. This includes external hard drives, mice, drawing tablets, and touchscreens.
Simply connect your external hard disk to your computer. Then select the songs you want to play later, copy them and paste to your computer hard drive. And after disconnecting your external hard disk you can now play the selected songs from your computer hard drive.