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Copy or validation fails near the end

Validation compares a checksum of every file on the new drive against the source. A failure near the end of a copy, or a hash mismatch, means at least one file on the destination doesn't match. The goal is to find out whether the problem is the source DCP, the drive, or the Mac's setup.

1. Check the source first

Add the source DCP to the Source panel and validate it on its own. If the source fails, the copy will fail too, and no setting in DCP Transfer will fix it. Download the DCP again or ask whoever made it to re-deliver. See Error Message: File missing.

2. Split the job into three steps

Running format, copy and validate in one pass hides which step is failing.

  1. File > Format Drive on its own.
  2. Run the transfer with Format unchecked.
  3. Validate the copy.

3. Rule out the hardware

  • Connect the drive directly to the Mac, not through a hub or dock.
  • Try a different cable and, if you can, a different drive. A drive that fails repeatedly at the same point is often the problem.
  • Avoid SMR (shingled) hard drives, which can slow to a crawl or stall during large sustained writes.

4. Make sure Paragon is current

A Paragon ExtFS build that doesn't match your macOS version can write data incorrectly. If you've upgraded macOS since installing DCP Transfer, follow Reinstalling DCP Transfer cleanly.

Still failing

Email support with the details in Contacting DCP Transfer support. Note the percentage where it stops and include the log files, which show the file that failed.

Copy or validation fails near the end — DCP Transfer Help — Cinematiq | Cinematiq