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encryption

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

Explainer: FileVault

On T2 and M1 Macs, FileVault provides robust protection of the Data volume on internal storage without any performance penalty.

April 23, 2022 Macs, Technology

Did someone forget their password? Getting access to a locked Mac

Maybe you’ve just forgotten the password, or perhaps the owner/user of the Mac is no longer able to enter it. How to restore access to different models.

January 18, 2022 Macs, Technology

Disk encryption, FileVault and hardware encryption

What is FileVault encryption? Is it the same as that on an M1 Mac’s internal SSD, or something different? How can you use it instead of overwriting an SSD? Which boot volumes are encrypted?

August 20, 2021 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

APFS changes in Big Sur: how Time Machine backs up to APFS, and more

APFS adds 6 volume roles, including one which supports Time Machine backups. And per-file encryption is coming.

June 29, 2020 Macs, Technology

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