A disk space analyzer is a software utility for the
visualization of disk space usage by getting the size for each
folder (including sub-folders) and files in a folder or drive.
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disk space analyzer
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It is called "Disk Usage Analyzer" , it's located under the
"Applications" menu, inside the "Accessories" section.
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Running a computer analysis requires downloading a free program
such as System Analyzer. This program will look for increasing
speed, disk space, system security, and many more things to get
your computer in good running condition.