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Apple introduces ASIF disk image format in macOS 26 Tahoe for faster virtual storage
- Apple introduces ASIF disk image format in macOS 26 Tahoe for faster virtual storage.
- ASIF format aims to enhance virtual storage performance on Apple silicon Macs, addressing speed limitations in traditional encrypted sparse images.
- ASIF disk images show significantly improved read and write speeds approaching those of a Mac's internal SSD, setting new benchmarks for virtual storage performance.
- Early tests on MacBook Pro M3 Pro and Mac mini M4 Pro running macOS 15.5 demonstrate impressive unencrypted and encrypted transfer rates reaching up to 8.3 GB/s.
- ASIF format is structured independently of the host file system, flagged as sparse files in APFS to minimize physical disk space usage.
- Creation of ASIF disk images currently requires Disk Utility app or diskutil command-line tool in macOS 26, lacking support in earlier macOS versions.
- Apple recommends transitioning virtual machines to ASIF images for improved speed and efficiency in VM file transfers between hosts or disks.
- ASIF images consolidate all data into a single file, simplifying management and enhancing overall speed compared to traditional disk image types like sparse bundles.
- Despite performance advantages, ASIF format is limited to macOS Tahoe, with third-party apps and virtualizers needing adaptation for full utilization.
- Broader support and technical guidance are awaited from Apple, while developers are expected to update tools like DropDMG for ASIF compatibility, facilitating easier adoption.
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