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encryption

Ventura 13.3.1 can’t change the password of sparse bundles

hdiutil chpass, the only means of changing passwords for sparse bundles, doesn’t work in macOS Ventura 13.3.1. The workaround requires a VM and 13.1.

April 25, 2023 Macs, Technology

Just which volumes are encrypted?

Here’s an APFS (Encrypted) volume that isn’t encrypted, and an unencrypted volume with FileVault active. Something must be wrong.

April 7, 2023 Macs, Technology

How APFS mounts encrypted volumes, snapshots, cryptexes and more

Details of what happens when an APFS (Encrypted) volume is mounted, when mounting a Time Machine snapshot, unmounting a volume, and loading a Cryptex.

April 3, 2023 Macs, Technology

Why you should enable FileVault

T2 and Apple silicon Macs always encrypt the Data volume in internal storage. So why bother with enabling FileVault? And can you do that on external bootable disks?

March 31, 2023 Macs, Technology

What’s the overhead of using APFS encryption?

Is the performance overhead of using APFS Encrypted volumes to store sensitive data a reason for not doing so?

March 3, 2023 Macs, Technology

Which disk image format?

Plain read/write (UDRW), sparse image (UDSP), and sparse bundle (UDSB) compared for storage efficiency, performance, and convenience.

January 12, 2023 Macs, Technology

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

Inside Apple Archive: performance and control

How to work out how many threads and which cores are needed to achieve a compression rate up to 1.7 GB/s, and how to estimate power and energy.

May 11, 2022 Macs, Technology

Inside Apple Archive: more than a compression format

Provided in Archive Utility and three command tools, its LZFSE compression even supports APFS special files like clones and sparse files.

May 10, 2022 Macs, Technology

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