Business Insider:

As part of the iOS 10.3 update, Apple changed a basic part of how every iPhone and iPad works — its file system, or the way the computer stores data and knows where and how to find it.

With Monday’s update, Apple updated iPhones and iPads to its new Apple File System, upgrading from HFS+, which was developed over 30 years ago.

I don’t think Apple is getting enough credit for pulling this off without a hitch. Remarkable achievement.