Apple recently made a huge change to millions of iPhones and iPads worldwide when it rolled out their latest iOS update, iOS 10.3. However, people probably didn't notice any big changes to their devices after they updated, and that is exactly how Apple apparently wanted it to go down.

As per Yahoo Finance, iOS 10.3 brought with it a myriad of changes to the operating system itself, including adding features such as Find My AirPods and an improved Siri experience. However, unknown to most users, the latest update actually included an entire revamp of their device's file system.

Apple has been using their standard HFS+ file system for more than 30 years now. With the rise of bigger storage capacities and more advanced apps, engineers have been pressured to finally move to a more modern file system. iOS 10.3 finally did that as it changed the old HFS+ file system to Apple's latest Apple File System (APFS), which in itself offers a number of big advantages.

The move to the new file system will have a big impact on how future updates, apps, and peripherals will be used moving forward. APFS is fully optimized to work with Flash and SSD storage and it has a stronger encryption overall. A majority of the features that engineers had to program into the older file system are already built-in into APFS.

According to a report from Business Insider, the move itself was an extremely big risk for Apple, as moving to an entirely new file system does pose its own risks. There was a big possibility that users could have lost some of their data during the transition, but fortunately, that didn't happen.

Engineers were likely holding their breaths in the first few hours of the update's release, but after a lack of any complaints hours after it rolled out, Apple's employees were likely able to breathe easy. Surprisingly, Apple could have made a very big deal about the transition, but they apparently chose not to.