Apple Configurator: No Space Left on Device

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If you get an error “No space left on device” when restoring an iOS device, check your Mac hard drive.

Behind the scenes, Configurator (or Finder) will download an .ipsw to ~/Library/Group Containers/K36BKF7T3D.group.com.apple.configurator/Library/Caches/Firmware then unzip it to a temporary folder (in my case: /var/folders/vr/vv6dbtmd3r7bbk_2mt7qnr1h0000gn/T/com.apple.configurator.xpc.DeviceService). If you don’t have enough space to unzip it, you’ll get this error!

If you restore different model of devices at the same time, keep in mind that every model of device needs its own .ipsw.

In other words, make sure you have about 20GB of free space per device moidel before attempting a restore.