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disk image

Dismal write performance of Disk Images

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.

July 7, 2022 Macs, Technology

Why are Disk Images so slow at writing?

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?

July 5, 2022 Macs, Technology

Securing sensitive data

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.

December 29, 2020 Macs, Technology

Fitting a quart into a pint pot with sparse bundles

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.

September 21, 2020 Macs, Technology

A brief guide to disk image files

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?

September 19, 2020 Macs, Technology

Imaging APFS storage in Disk Utility, and size of the VM volume

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Disk Utility can’t image APFS volumes, and normally returns an error if you try to image a container. Here’s the workaround.

September 18, 2020 Macs, Technology

How would you like your sparse bundle: encrypted, changed band size, or what?

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Spundle 1.1 adds creation of encrypted sparse bundles, changing their band size, and more.

June 15, 2020 Macs, Technology

Spundle: a new utility for creating and adjusting sparse bundles

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Saves you from having to learn how to use hdiutil, and supports 6 different file systems and custom band sizes.

May 18, 2020 Macs, Technology

Sparse bundles: what they are and how to work around their bugs

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An efficient means of storage with many uses, but riddled with bugs and shortcomings. Explains how to compact and resize them, and more.

April 27, 2020 Macs, Technology

File Integrity 8 : Compression, encryption and disk images

Tests bring some surprises, with encrypted sparse bundles looking resilient to small amounts of corruption.

April 24, 2020 Macs, Technology

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