A quite legitimate criticism of iOS for some time has been the fact that you seem to end up with multiple gigabytes of unexplained “other” disk space usage after using the device for some time. It’s frustrating, especially on smaller devices.

Reinstalling iOS and restoring from your most recent backup would clear the mythical “other”, at least for a while.

It seems that the latest update to iOS, version 10.3, introduces a whole new filesystem technology, APFS. This wasn’t mentioned in the release notes, and is only really detectable by the end user in the form of a much longer upgrade process than would be needed for a typical iOS release.

Since upgrading a few devices, I have noticed a big jump in the available free space on those devices. The pesky “other” is still there, but appears to have shrunk significantly.

Hats of to Apple for fixing what was a criticism going a long way back, and for managing a quite potentially disruptive filesystem migration in such a transparent way for the end user.

May the “other” space usage forever remain small.