in macOS edited January 2014
Any idea why OS X keeps the screensaver preferences here:

/Users/<user_name>/Library/Preferences/ByHost/<MAC address>.plist

Why the "ByHost" sub directory?

Any idea why the plist has to have a unique MAC address as an identifier in the .plist's name?


  • Reply 1 of 2
    dogcowdogcow Posts: 713member
    Perhaps the .Mac Screensaver? Not sure why it would need your MAC address, however.
  • Reply 2 of 2
    Mac OS X's defaults system (ie: preferences) is keyed by user, application, and host. If your computer lacks a hostname, the MAC address is used.
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