I sometimes use Steam for games on my Hackintosh, but I partitioned my disk as Mac OS Extended (Case-sensitive, Journaled) which is incompatible with Steam. Instead of creating a whole new partition table for a small application, you can create a disk image of a case-insensitive format and run Steam from there. These Terminal commands will create this disk image. If you do not create a separate SteamApps folder, replace 500m (on row 26) with a byte size that can fit your games aswell, eg 40g.
#!/bin/bash mkdir -p /Applications/Steam.app/Contents/Resources mkdir -p /Applications/Steam.app/Contents/MacOS plist=/Applications/Steam.app/Contents/Info.plist /usr/libexec/PlistBuddy -c "Add CFBundleExecutable string 'Steam'" $plist /usr/libexec/PlistBuddy -c "Add CFBundleInfoDictionaryVersion string '1.0'" $plist /usr/libexec/PlistBuddy -c "Add CFBundlePackageType string 'APPL'" $plist /usr/libexec/PlistBuddy -c "Add CFBundleSignature string '????'" $plist /usr/libexec/PlistBuddy -c "Add CFBundleVersion string '1.0'" $plist /usr/libexec/PlistBuddy -c "Add CFBundleIconFile string 'steam.icns'" $plist bin=/Applications/Steam.app/Contents/MacOS/Steam echo '#!/bin/bash' > $bin echo 'hdiutil detach /Volumes/Steam' >> $bin echo 'if [ != /Volumes/Steam ]' >> $bin echo ' then hdiutil detach -force /Volumes/Steam' >> $bin echo 'fi' >> $bin echo '' >> $bin echo 'hdiutil attach -noverify -nobrowse /Applications/Steam.app/Contents/Resources/Steam.dmg' >> $bin echo '/Volumes/Steam/Steam.app/Contents/MacOS/steam.sh' >> $bin echo '' >> $bin echo 'hdiutil detach /Volumes/Steam' >> $bin echo 'if [ -e /Volumes/Steam ]' >> $bin echo ' then hdiutil detach -force /Volumes/Steam' >> $bin echo 'fi' >> $bin chmod +x /Applications/Steam.app/Contents/MacOS/Steam hdiutil create -size 500m -fs "Journaled HFS+" -volname Steam /Applications/Steam.app/Contents/Resources/Steam.dmg hdiutil attach -noverify -nobrowse /Applications/Steam.app/Contents/Resources/Steam.dmg mkdir -p /Volumes/Steam/Steam ln -s /Volumes/Steam/Steam $HOME/Library/Application\ Support/Steam curl http://media.steampowered.com/client/installer/steam.dmg -o $TMPDIR/steam.dmg hdiutil attach -noverify -nobrowse $TMPDIR/steam.dmg cp -RX /Volumes/Steam\ 1/Steam.app /Volumes/Steam/ cp -X /Volumes/Steam\ 1/Steam.app/Contents/Resources/steam.icns /Applications/Steam.app/Contents/Resources/ chmod +x /Volumes/Steam/Steam.app/Contents/MacOS/steam.sh rm $TMPDIR/steam.dmg hdiutil detach /Volumes/Steam if [ -e /Volumes/Steam ] then hdiutil detach -force /Volumes/Steam fi hdiutil detach /Volumes/Steam\ 1 if [ -e /Volumes/Steam\ 1 ] then hdiutil detach -force /Volumes/Steam\ 1 fi
When you are prompted to accept a license, just press Q, Y and ↵, in chronological order. After running all the commands, reboot and start Steam from the application in /Applications. You may have to create a firewall exception, by opening System Preferences, Security & Privacy, Firewall and Firewall Options…