Three types of Disk Image, encrypted or not, tested when freshly made or used and remounted. So many variations, but only one type of Disk Image can be trusted for writing.
disk image
A Mac Studio Max has an SSD delivering up to 7.4 GB/s, and a CPU up to 50% faster than a 16-core Xeon. Why does it write an encrypted disk image at the speed of a slow hard disk?
Securing sensitive data from access by others, and safeguarding it from loss of damage, is common. Solutions range from encrypted images to specialist external disks.
How to store a 400 GB sparse bundle on a volume which only has 200 GB free space – provided that you don’t actually use the space that isn’t there.
So many different types, from read-only disk image .dmg files, to sparse bundles and DVD/CD-R masters. Which to use, and how to create them?
Disk Utility can’t image APFS volumes, and normally returns an error if you try to image a container. Here’s the workaround.
Spundle 1.1 adds creation of encrypted sparse bundles, changing their band size, and more.
Saves you from having to learn how to use hdiutil, and supports 6 different file systems and custom band sizes.
An efficient means of storage with many uses, but riddled with bugs and shortcomings. Explains how to compact and resize them, and more.
Tests bring some surprises, with encrypted sparse bundles looking resilient to small amounts of corruption.
The Eclectic Light Company 