Issue Description
SD cards or USB drives do not appear in Finder or Disk Utility.
Common Causes
- Unsupported file systems
- Dirty connectors
- USB power issues
Step-by-Step Solution
Step 1: Check Disk Utility
- Open Disk Utility
- Look under External
Step 2: Mount Drive Manually
- Select device → click Mount
Step 3: Check Finder Settings
- Finder → Settings → General
- Enable External disks
Step 4: Try Another Reader or Port
- Test with different SD reader
- Avoid hubs
Explore Further
- Reformat drive if compatible
Prevention & Best Practices
Always eject drives safely.