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Mac Error Code -50 — Parameter Error

Warningsystem

Overview

Mac error code -50 (paramErr) means an invalid parameter was passed during a file operation, commonly when copying or moving files.

Key Details

  • Classic Mac OS error code -50 (paramErr)
  • Common when copying files to external drives
  • Often appears with USB drives or network shares
  • Can indicate file system incompatibility

Common Causes

  • File system incompatibility (NTFS write attempt)
  • Corrupted file metadata
  • External drive formatting issues
  • Network share permission problems

Steps

  1. 1Try copying the file to a different location first
  2. 2Reformat external drive to APFS or exFAT
  3. 3Reset NVRAM: restart and hold Option+Command+P+R
  4. 4Run Disk Utility First Aid on the destination drive

Tags

macmacossystemerror 50fixtroubleshooting

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Frequently Asked Questions

The USB drive may be NTFS formatted — macOS cannot write to NTFS natively.