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Fixing External SSD Not Mounting on macOS

Issue Description 

External SSD connects but does not mount or appear in Finder. 

Common Causes 

  • Unsupported file system 
  • Corrupt partition 
  • Power issues 

Step-by-Step Solution 

Step 1: Check Disk Utility 

  • Open Disk Utility 
  • Look under External 

 

Step 2: Mount or Repair Disk 

  • Select SSD → click Mount 
  • Run First Aid 

 

Step 3: Check File System Compatibility 

  • NTFS drives are read-only on macOS 
  • Install compatible drivers if needed 

 

Step 4: Try Another Port or Cable 

  • Avoid hubs 

Explore Further 

  • Reformat SSD if data is backed up 

Prevention & Best Practices 

Eject drives properly.