FastCopyFastCopy FAQ
Long-tail questions get a short answer here first; when a question proves popular it graduates into a full guide.
Settings
QWhich buffer size is fastest?
On SSDs the default 2 MB is near-optimal. On mechanical HDDs, 1 MB with OverLap I/O enabled usually measures faster — the default changed to 2 MB in v5.11.0 and HDD users noticed. Buffer settings guide →
QHow do I push an NVMe drive to its throughput limit?
Run as administrator, then enable pre-allocated space — measured 20–30% extra throughput on NVMe-to-NVMe copies. Full parameters and caveats in the guide. Buffer settings guide →
QHow do I exclude folders or file types from a copy?
Semicolon-separated wildcards in the Exclude field: *.tmp;node_modules\. A trailing backslash excludes a whole directory. Exclude filter guide →
Errors
QCopying fails when the destination is a drive root — what now?
A drive root path (like D:\) cannot have its trailing separator stripped automatically, which triggers an error. Append * to the source path instead of changing the destination.
QWhat does a CRC error during copying mean?
Data arrived on disk different from what was read — usually a USB cable, port or bad sector. Work through cable, chkdsk, SMART, RAM in that order. CRC error fix guide →
QWhy did my copies get slower after updating?
v5.11.0 changed the default buffer from 1 MB to 2 MB, which can hurt HDDs. Set it back in Options. Other common causes: Task Scheduler I/O priority and antivirus scanning. Slow-copy troubleshooting →
Compatibility & licensing
QWhere are the config file and logs stored?
Depends on install location: under Program Files it goes to the user AppData folder, otherwise it sits next to the executable (portable mode).
QDoes FastCopy work on Mac or Linux?
No — FastCopy is Windows-only. Use rsync (built-in on both) as the closest substitute; dedicated GUI options exist for macOS backups. Mac alternatives →
QIs FastCopy free? What about the Pro edition?
FastCopy (standard) is free for personal use. A Pro edition with support and commercial licensing is sold through the official channel — always via the official site, not third-party installers.
About This Tool
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