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Duplicate

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I can’t complete that title as written because it appears to contain incomplete or malformed HTML. I’ll assume you want an article for the topic “Duplicate Files” (related to hardlink scanner). I’ll write a concise article about detecting and handling duplicate files, including hard links. If you’d like a different title, give the exact text.

Duplicate Files: How to Detect and Safely Remove Them (Including Hard Links)

Duplicate files waste disk space and make backups larger. This guide explains how to find duplicates, understand hard links, and remove duplicates safely.

What are duplicate files and hard links

  • Duplicate files: Separate files with identical content stored in different locations. They each use additional disk space.
  • Hard links: Multiple directory entries that point to the same inode (same data). They don’t duplicate disk data; deleting one hard link doesn’t free space until all links are removed.

Why distinguishing matters

  • Deleting a duplicate file that’s actually a hard link may not free space and can break references if programs expect the link. Tools that detect duplicates should report link counts and inode numbers so you can choose safely.

How to find duplicates

  1. Checksum-based scan: Compute hashes (MD5/SHA256) of files to identify identical contents. Good for accuracy.
  2. Size+timestamp prefilter: Compare file sizes and modification times before hashing to speed up scans.
  3. Byte-by-byte compare: Final confirmation for suspected duplicates.
  4. Detect hard links: On Unix-like systems, check inode and link count; on Windows, check file IDs and hard link counts.

Tools (cross-platform)

  • Command-line: fdupes, rdfind, rmlint (Linux/macOS), PowerShell Get-FileHash (Windows)
  • GUI: Duplicate Cleaner (Windows), Gemini (macOS), dupeGuru (cross-platform)
  • Hardlink-aware: rmlint and some scanners report inode/file ID and link counts.

Safe removal workflow

  1. Back up important data.
  2. Run a scan with a reputable tool; enable preview mode.
  3. Review matches and metadata (paths, sizes, hashes, inode/link count).
  4. Prefer replacing duplicates with hard links if you want to save space but keep access (some tools offer this).
  5. If deleting, remove only one copy per duplicate group and confirm no critical references.
  6. After deletions, run filesystem checks if you suspect corruption.

Automation and policies

  • Schedule scans monthly for large or shared storage.
  • Exclude system directories, app data, and source code repositories where duplicates may be intentional.
  • Maintain a log of removals and keep a short-term backup for recovery.

Troubleshooting

  • False positives from identical-but-intended files: check metadata and context.
  • Permission issues: run scans with appropriate privileges.
  • Network drives: ensure consistent metadata and consider running scans on the server.

If you want, I can:

  • Create a step-by-step command-line recipe for your OS (Windows, macOS, or Linux).

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