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Apple introduces ASIF disk image format in macOS 26 Tahoe for faster virtual storage

What just happened? Apple's latest update for Macs, macOS 26 Tahoe, introduces a significant leap forward in disk image technology with the debut of the ASIF format – a development that could reshape how users and developers handle virtual storage on Apple silicon Macs. For years, disk images have been a staple for Mac users, enabling everything from encrypted file storage to virtual machine management. However, these images have long suffered from sluggish performance, especially when encrypti

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macOS Tahoe brings a new disk image format

Disk images have been valuable tools marred by poor performance. In the wrong circumstances, an encrypted sparse image (UDSP) stored on the blazingly fast internal SSD of an Apple silicon Mac may write files no faster than 100 MB/s, typical for a cheap hard drive. One of the important new features introduced in macOS 26 Tahoe is a new disk image format that can achieve near-native speeds: ASIF, documented here. This has been detailed as a major improvement in lightweight virtualisation, where i

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