write down examples of internal and external memory
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More commonly referred to as an external drive, external storage is storage that is not part of the computer. Examples of external storage are floppy disk drives, hard drives, tape drives, etc. The picture is an example of a Drobo and an example of a popular external storage solution.
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Internal memory is limited in its versatility. Generally, once it's connected to a computer, that's where it stays. You cannot remove internal memory without taking your computer apart. However, as you may expect, you don't have to keep external memory attached to one computer. External storage devices are designed so you can easily share these devices between computers.
Storage
Computers ship with a finite amount of internal memory. You may see the storage capacity advertised along with the purchase price, but some of internal memory, or system memory, is reserved for the operating system and applications currently running on the computer. The only way to increase internal memory is by replacing the internal memory chips with larger-capacity modules or by installing new memory chips in available memory-expansion slots, if the system's motherboard supports them. RAM is also used to store the files that define the file system structure to allow the computer to read and write to its devices properly.
Portability
Internal memory is usually chips or modules that you attach directly to the motherboard. Internal ROM is a circular disc that continuously rotates as the computer accesses its data. External memory often comes in the form of USB flash drives; CD, DVD, and other optical discs; and portable hard drives.