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Tune for Performance: Do you really need a big internal SSD?

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Why pay an extra $600 for a 2 TB internal SSD, after all fast external SSDs are cheaper. Maybe you need to check whether disk performance becomes a rate-limiting factor.

December 12, 2024 Macs, Technology

Disk Images: Bands, Compaction and Space Efficiency

How do sparse bundles and read-write disk images compare with regard to their efficient use of disk space, and in maintenance requirements? Here are test results from Sequoia.

October 21, 2024 Macs, Technology

Disk Images: Performance

Sparse bundles (UDSB), read-write disk images (UDRW) and sparse images (UDSP) compared on two SSD, with and without container encryption.

October 16, 2024 Macs, Technology

Disk Images: How read-write disk images have gone sparse

The only disk images of varying size used to be sparse bundles and sparse disk images. Now plain read-write disk images can also vary in the disk space they take, as explained here.

October 14, 2024 Macs, Technology

Disk Images: Tools

Which are the best tools for the occasional user? For someone who creates disk images to distribute sofware? Or for hacking sparse bundles?

October 9, 2024 Macs, Technology

Disk Images: Introduction

Focussing on sparse bundles and UDIF read-write disk images, this explains their types, structure, how their size can change, and how fast they are in use.

October 7, 2024 Macs, Technology

Where has Safari gone, and why are macOS updates larger for Apple silicon?

Safari and its supporting frameworks and components, used to be installed in the Data volume, but now come in cryptexes. These also account for the larger macOS updates for Apple silicon.

September 4, 2024 Macs, Technology

Copy speeds of large and sparse files

What can cause low copy speeds for very large and possibly sparse files, such as VMs? Causes explained, and tools you can use to discover why.

August 7, 2024 Macs, Technology

APFS: How sparse files work

Sparse files are now common among databases, disk images, and virtual machines. How they work in APFS, how they’re created, and how they can explode.

June 8, 2024 Macs, Technology

APFS: Special file types

Overview of clone files, dataless files, sparse files, symbolic links, and firmlinks, and how used and free space is accounted for in APFS.

April 15, 2024 Macs, Technology

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