- Sep 21, 2010
- Asus ProArt Z490 Creator
- RX 580
- Classic Mac
- Mobile Phone
Apple Support Document:
Prepare for APFS in macOS High Sierra
"Apple File System (APFS), is the default file system in macOS High Sierra for Mac computers with all flash storage. APFS features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals.
When you upgrade to macOS High Sierra, systems with all flash storage configurations are converted automatically. Systems with hard disk drives (HDD) and Fusion drives won't be converted to APFS. You can't opt-out of the transition to APFS."
Other World Computing has a "translation" of information in the Apple Support Document: Translating Apple’s New High Sierra & APFS Compatibility Document.
Update: I can confirm that TRIM is on by default in High Sierra using APFS with a Samsung 950 Pro M.2 NVMe SSD as reported by:
About this Mac > System Report > Hardware > NVMExpress > TRIM Support > Yes
No need to use the Terminal command trimforce or other TRIM applications.
Update: aol found another excellent article on APFS is at ArsTechnica. Scroll down to the bottom of the page in the last paragraph, Compatibility with other OSes, there is another caution which IMO is a biggie! (My bold for emphasis.)
Apple says that it “plans to document and publish the APFS volume format specification” at some point, but, for now, the only operating system that can read and write to APFS volumes is High Sierra (you may be able to use Sierra, too, but its APFS implementation is incomplete and only intended for developer testing). You’ll want to hold off on converting all your external disks until you’re sure you’ll only be using them with High Sierra Macs.
Update November 05, 2017. CCC’s Bombich now “approves” the use of APFS > Evaluating the High Sierra Upgrade
Carbon Copy Cloner's Blog: https://bombich.com/blog
Appleworld Today's What you need to know about APFS and macOS High Sierra compatibility
PikeRAlpha's Do I use APFS?