High Sierra’s APFS optimized for flash storage & SSD, incompatible with legacy HDDs and possibly Fusion Drives

High Sierra’s APFS optimized for flash storage & SSD, incompatible with legacy HDDs and possibly Fusion Drives



 

The new APFS brings notable enhancements to High Sierra and iOS, but on the Mac it appears that legacy hard drives are completely incompatible with the technology and at least at launch that Fusion drives may not be either.

In an Apple support document published on Aug. 21, the company notes that systems with flash and SSD storage will be configured automatically —and users cannot opt-out of the transition. However, in the same document, it also notes that systems with hard drives and Fusion drives won’t be converted at all.

During the early beta process, it was not mandatory to migrate flash-based system drives to APFS.

It is unclear if this is a permanent state for APFS in regards to non-flash based storage media. In the latest developer beta of High Sierra, the hard drive prohibition is clear, but release notes declare that “some” iMacs with 3TB Fusion Drives “may be unsupported for use with APFS.”

During the testing process, compatibility remains with HFS+ in APFS. Devices formatted as HFS+ can be read and written to by devices formatted as APFS, and drives formatted as APFS can be read and written by HFS+ formatted systems running macOS 10.12.6 or later.

Only High Sierra can boot from an APFS-formatted partition, however. Additionally, Boot Camp does not support reading to or writing from APFS volumes.

AppleInsider has reached out to Apple for clarification of the discrepancies between the support document and the release notes for the High Sierra beta, and will update with any information that is shared with…



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