hdiutil is deprecated in macOS 27 Golden Gate

The macOS command-line tool hdiutil, used for manipulating disk images, is set to be deprecated in macOS 27.0 Golden Gate. Users are encouraged to use diskutil image for all disk image operations instead. diskutil image supports subcommands for attach, create, resize, info, and chpass, and it handles ASIF (Apple Sparse Image Format) images, which hdiutil does not support.

Hdiutil's man page includes a DEPRECATION NOTICE listing the diskutil replacements for hdiutil subcommands. While many hdiutil options appear to be preserved in diskutil, some are missing, such as -puppetstrings for progress output, and options specific to hdiutil create -srcfolder. Testing showed that diskutil was faster and created smaller dmg files compared to hdiutil, but it lacked the verbosity provided by hdiutil.

Additionally, diskutil did not trigger an authentication prompt for root-owned files, requiring manual deletion to resolve errors. Despite these improvements, diskutil still faced the previously reported bug of inaccessible .bnnsir files on macOS Sequoia, and Apple requested further investigation, leading to a request for an iOS sysdiagnose.