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Vacuon is a disk space analyzer for Windows, published by Joedson Alves, that falls into the disk management and cleanup utility category and is currently at version 0.7.0, with six versions released to date. Its purpose is to show where the space on a Windows disk has gone, and it does so by reading the NTFS Master File Table directly off the volume, indexing a million files in seconds instead of minutes, with a fallback to the Windows API on volumes where direct access is not possible. Typical use cases include locating large files, finding duplicates with identical content, and grouping similar pictures by a perceptual fingerprint. The volume is drawn as a treemap where every box is sized by what it occupies, images and videos appear as thumbnails in six sizes so similar renders can be distinguished without opening them, and a preview panel shows media details, text and images without leaving the app. A live monitor reads the NTFS change journal to show which folders are growing right now. Safety is central to its design: deletion goes to the Recycle Bin by default, permanent deletion sits behind a confirmation checkbox, and a protection list refuses the volume root, Windows, System32 and kernel-owned files, while every scan cross-checks the space it attributes. Instead of deleting, files can be set aside in a quarantine from which they can be restored, rule-based cleaning is supported, and where work belongs inside Windows the program calls Microsoft's own tools rather than deleting files by hand. Files and folders can be copied or moved through a transfer window that counts real bytes, and individual files can be opened for editing inside the app, either as text with syntax colouring or byte by byte, the latter working even on executables after asking for confirmation.
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