Step 3: It is essential to estimate how data already exists on disk drives, archival storage facilities, and remote processing sites everywhere. With this estimate, add up what is expected to show up in the next 12 months. This is the starting point of computing storage needs. It is not good to be in the middle of processing any transaction and get a "disk is full" message. In a desk drawer or paper file cabinet, there are methods to squeeze one more file into the drawer.
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