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On Windows, defragment tools usually show you a preview of your disk: where the file fragment are placed on disk, where is the free space, where is the places that's not movable, etc.

Is there a similar tool for Linux that can show you similar preview or a more detailed map?

I need such tool for some raw disk hacking.

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Could you elaborate please? What kind of raw disk hacking? Do you need a graphical output? –  terdon Oct 6 '12 at 10:40
    
I look for the something like this: blog.edgetechcorp.com/wp-content/uploads/2010/04/… I don't want to defrag, but want to see that disk map. Probably zoom in if possible. By raw disk hacking I mean view what's actually stored on the disk sectors, how and where does file placed. Probably modify some bytes. –  Calmarius Oct 6 '12 at 11:15

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In Linux, you'll probably never have a high level of fragmentation, as the filesystem behaves much better than the Windows counterparts.

For a detailed usage map of your disk, you can use kdirstat or fsview that comes integrated in konqueror, a web and file browser.

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