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Mac OS High Sierra

This fall, Apple plans to release its High Sierra (10.13) operating system. At this time, we recommend that users do not update to this operating system without contacting CTS first.

As with most Operating System upgrades, there are some enhanced features and some new functionality. High Sierra is similar to other Operating System upgrades in that it has several ways to facilitate the upgrade and different configuration options for users to choose. If a user makes certain configuration choices during the upgrade, they could potentially make their data permanently inaccessible.

Apple File System

With macOS Sierra Apple announced plans to transition to a new Apple File System (APFS), and in macOS High Sierra, that transition is being completed. When installing macOS High Sierra, the new, much more modern file system is implemented as the new default, replacing the old HFS+ file system.

APFS is a 64-bit file system that's not only optimized for modern storage like solid state drives, but it's also easily adaptable to future storage technologies. APFS is safe and secure, offering crash protection, safe document saves, stable snapshots, simplified backups, and native encryption.

It's much more responsive than HFS+, with instant file and directory cloning, fast directory sizing, high performance parallelized metadata operations, and sparse file writes.

What the average macOS High Sierra user needs to know about APFS is that it's a significant improvement over HFS+ that's going to introduce better performance in the form of simple encryption, faster file transfers, and more.

Please Note: Updating the file system of an operating system can be a complicated and time consuming procedure. Often it is best to wait until the Operating System is live for a few weeks to determine if significant bugs exist within the software. Please contact CTS if you have any questions about upgrading.


macOS High Sierra is compatible with all Macs that can run macOS Sierra.

  • iMac (Late 2009)
  • MacBook (Late 2009)
  • MacBook Air (Late 2010)
  • MacBook Pro (Mid 2010)
  • Mac mini (Mid 2010)
  • Mac Pro (Mid 2010)

An overview of all new upcoming features can be found here: https://www.apple.com/macos/high-sierra-preview/