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sparse bundle

Backing up to network storage: checks and balances

Backing up with Time Machine to a NAS or other network storage is different. Here’s an account of how it creates and handles sparse bundle storage in Ventura 13.2.

February 1, 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

Sparse disk images in virtual machines

All you need to know about the sparse RAW disk images used inside lightweight VMs on Apple silicon Macs.

January 10, 2023 Macs, Technology

How plain disk images went sparse in Monterey

In Monterey and Ventura, regular read-write UDRW disk images can now be APFS sparse files, and work more efficiently than sparse images or sparse bundles.

January 9, 2023 Macs, Technology

Should you use a disk image or a volume?

Disk images originated in the 1960s, and are still valuable tools in modern macOS. They have their limitations, though, and in some cases should be replaced by APFS volumes.

January 7, 2023 Macs, Technology

Why won’t that sparse bundle compact?

T T Read More

If you try compacting a sparse bundle, Spundle and hdiutil could return error 1. This explains why, and fixes Spundle to get over it.

August 17, 2022 Macs, Technology, Updates

Using macOS versions beyond local volumes

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It’s all too easy to lose all previous versions of a document: one false move to another volume, to iCloud, or shared over a network and they’ve gone. How can you preserve them?

August 8, 2022 Macs, Technology

A user’s guide to Disk Images

They have more options than most new cars. What are they, how do you use them, how to pick the most appropriate, and which tools to use.

July 11, 2022 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

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