Case Sensitive Filesystems and Steam on macOS

Steam requires that ~/Library/Application Support/Steam be created on a case insensitive filesystem

Steam requires that ~/Documents/Steam Content be created on a case insensitive filesystem.

Case sensitive filesystems and partitions are not supported by Steam. Valve recommends that you have both Steam and your user folder installed on case-insensitive partitions or hard drives.

You can check whether you have a case-sensitive partition by doing the following;

  • Open Terminal
  • Type diskutil info /
  • Press the Enter button
  • Scroll down to File System Personality

If case-sensitive, the output will mention Case-sensitive Journaled HFS. If case-sensitivity is not specified, you are using a case-insensitive partition.

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