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Storage Calculator is a useful Windows tool that allows via a simple GUI to calculate the hard disk space needed for your files (projects, video & audio files, documents, etc.).
Once launched, you will be asked to enter the data storage device capacity (external/internal SATA hard drives, SCSI disk drives, etc.) in GB, the average size of one file, and FPS (video frame rate capture), then the tool will estimate the number of files as well as the number of hours of video that can be stored on the storage medium:
Storage Calculator is a portable application that can be installed in Windows 7 and any older version of Windows operating systems. You can download it here.