Does resetting NVRAM delete my data?

No, NVRAM only stores display resolution, startup disk, time zone, and audio volume. Your files are not affected.

Can third-party NTFS drivers help?

Yes, Paragon NTFS or Mounty for NTFS can enable write support, but exFAT reformatting is the cleaner solution.

Mac Error -50 — Parameter Error (paramErr)

Warningfinder

Overview

Mac error -50 is a parameter error occurring during file operations on external drives, typically caused by file system incompatibility or corrupted metadata.

Key Details

Error -50 maps to paramErr — an invalid parameter was passed to a file system operation
Very common when writing to NTFS drives (macOS has read-only NTFS support)
Also occurs with corrupted file metadata on HFS+ or APFS volumes
Can appear when ejecting drives that have pending write operations
Network shares with permission mismatches may trigger this error

Common Causes

Trying to write to an NTFS-formatted drive (read-only on macOS by default)
Corrupted file system metadata on the target volume
File size exceeding FAT32 4GB limit when copying large files
PRAM/NVRAM storing outdated disk parameters
Corrupted preference files affecting file operations

Steps

1Check the drive format: Disk Utility > select drive > check Format column
2For NTFS drives: use exFAT format instead (compatible with both Mac and Windows)
3Reset NVRAM: restart and hold Option+Command+P+R for 20 seconds
4Run First Aid on the volume in Disk Utility
5For network shares: disconnect and reconnect, verify credentials and permissions