DiskMap

What DiskMap is

DiskMap is a free Windows disk usage analyzer that shows where drive space is used and supports cleanup. It scans filesystems with a parallel recursive scanner and can read the NTFS $MFT directly when run elevated, switching methods automatically if needed. Results appear as treemaps or sunbursts colored by file type, with drill-down and synchronized file-tree selection. Duplicate detection groups files by size, narrows candidates with prefix hashes, and confirms matches using full hashes. DiskMap saves scans locally and compares snapshots to show what grew or shrank. Its cleanup panel identifies temporary files, browser and thumbnail caches, old error reports, and Recycle Bin contents; selected deletions go to the Recycle Bin. The maker says there is no telemetry, account, or cloud service, and settings and history stay local. Advanced Mode exposes filesystem details such as hard links, alternate data streams, MFT indexes, reparse information, slack space, and diagnostics. Scan controls include checkpoint resume, memory saving, and impact settings.