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Understanding Memory
One megabyte of memory used to be considered a generous amount. Then 32 megabytes was plenty even for professional applications. Now the cheapest entry-level systems ship with 64 megabytes, and 128 megabytes is considered normal. Memory prices have come down enough to enable most users to buy all the memory they need. The hardware requirements of digital video include a generous amount of memory, but a user should not buy more than they need because available funds might better be used to expand hard drive

  Tutorials
  What is Memory?
  What is Main Memory?
  Understanding Cache Memory
  Using Other Types of Memory