AppleInsider’s early look at macOS 27 reveals a glaring compatibility gap for users who depend on proprietary RAID enclosure software. The Thunderbolt 3 LaCie 12Big that runs flawlessly on macOS 26 now fails to mount or initialize under the new OS, even after fresh installs and cable swaps. Meanwhile, generic “dumb” enclosures continue to work. This failure threatens workflows that depend on fast local storage.

The break appears tied to Apple’s driver overhaul and the removal of all Intel‑only code in macOS 27, which can cripple drivers compiled for legacy hardware. Similar disruptions hit Drobo and Pegasus users when Apple altered its boot selector a few years back. In contrast, SoftRAID from OWC still creates new arrays on standard drives without issue. Consequently, enterprises may need to roll back updates until fixes arrive.

For professionals running mission‑critical storage, the advice is clear: avoid beta installs until vendors certify their software, and reach out now to confirm macOS 27 support. If a vendor cannot promise updates, users should migrate to hardware that relies on native macOS utilities or network‑attached solutions. Otherwise, data access may be lost after the upgrade. Otherwise, productivity stalls and backup strategies must be re‑evaluated.