FastCopyFastCopy settings reference: every option explained
The Options dialog groups every FastCopy behavior. The defaults are sensible for SSDs; the settings below matter most for performance tuning, verification and automation.
I/O settings
- Main buffer (MB) and I/O unit (2 MB recommended; 4 MB+ can slow network drives).
- Async I/O count (recommended 8); disable async on problematic SD-card adapters.
- Small files below the NTFS (64 KB) / FAT (128 KB) threshold skip direct I/O to reduce seeking.
Verify options
- Hash: xxHash3 recommended; MD5/SHA-1/SHA-256/SHA-512/SHA3 also available.
- On failure: rename to .fc_verify_err, delete, stamp 1980-01-01, or do nothing.
- Verify-every-30-seconds option reduces device-cache effects; hashes can be stored in the :fc_verify stream.
Drive groups, CPU and concurrency
- Drive groups force parallel treatment for RAID volumes (e.g. "CE") or group letters on one disk ("CD,EF").
- CPU affinity: read and write on separate logical cores by default.
- Limit how many FastCopy instances run at once; same-disk jobs still queue.
Copy, move, sync and delete options
- Pre-allocate space: +20-30% on local drives when elevated.
- Auto-rename on copy-into-source, timestamp tolerance (ms) with DST modes, NSA-style triple wipe.
- Sync can delete before copying (two scans, slightly slower).
Logs, shell extension and post-run actions
- File logs per day (Log\date.log) with auto-deletion; symbols: + created, - deleted, -> symlink, => hard link, !! verify error.
- Shell extension: right-click/drag-drop menus, or replace standard Explorer drag-drop and paste (v5.12+, off by default).
- Post-run: sound, shutdown with 60-second countdown, arbitrary commands and Slack-style webhooks.
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