JDiskReportenables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders. The tool analyses your disk drives and collects several statistics which you can view as overview charts and details tables. This is a great tool if you are looking for a program that analyses your hard drives content. Shows lots of useful information like which filetypes use the most space on your hard drives, file modification and folder size.
This is ad- and nag-free uncrippled binary multi-platform software that is free of charge and that never expires.
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oh, you need java for it ;)