iOS 10.3 Will Update Your iPhone’s File System to APFS from HFS

Apple debuted
a new filesystem dubbed APFS
(Apple File System)
with the release of macOS Sierra last year. Now,
the upcoming upgraded version of iOS 10.3 will bring a change to the iPhone’s
file system from HFS+ to APFS. Apple notes that with the iOS 10.3 release, the
file system of iOS devices will be upgraded to APFS including iPhone, iPad,
Apple Watch, and Apple TV.
The upcoming upgraded version of iOS 10.3 will bring a change to the iPhone's file system from HFS+ to APFS. When you update to iOS 10.3, your iOS device will update its file system to Apple File System (APFS)

When you
update to iOS 10.3, your iOS device will update its file system to Apple File
System (APFS). This conversion preserves existing data on your device. When you
update your idevices to iOS 10.3, it will automatically update its file system
to Apple File System (APFS). So with any software update, it is recommended
that you create a backup of your device before doing.

Apple File
System is a new, modern file system for iOS, OS X, tvOS and watchOS. It is
optimized for Flash/SSD storage and features strong encryption, copy-on-write
metadata, space sharing, cloning for files and directories, snapshots, fast
directory sizing, atomic safe-save primitives, and improved file system
fundamentals.

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