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RAM (Random Access "Memory") stores information temporarily while the power is on. Hard Disk "Space" stores information permanently regardless of whether the power is on or off.

Computer specifications usually specify RAM as system "memory" (like 2GB DDR2 MEMORY) and refer to Hard Disk storage as "Hard Drive(s)", system "storage", or "Disk Space" (like 320GB HARD DRIVE).

Think of the Hard Drive as a storage shed and the RAM as the playground. The computer gets the programs/data from the hard drive and pulls them out temporarily into the playground for you to use, then stores them back in the shed when you are done.

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Q: Size of computer memory refers to RAM or hard disk?
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