This is how you describe the capacity to store information locally or remotely. If you only have 10 megabytes of "Free" disk storage space, and have a program you wish to install that requires 20 megabytes of free disk space, you must free up at least another 10 megabytes of disk space in order to be able to store or install the program to a storage device. Disk space is measured in everything from bits to terabytes.
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