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How disk images and VMs are more efficient

Summary by eclecticlight.co
For many years, most types of disk image were inefficient in their use of storage space, as they occupied their full size on disk. Until recently, when you created a 5 GB read-write UDIF disk image, one of the most popular, it invariably took up 5 GB in storage, even when empty. This also applied to the raw disk images used by Virtual Machines: give a VM 100 GB, and that’s just what it took on disk. With the introduction of sparse files in APFS,…
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eclecticlight.co broke the news in on Wednesday, April 9, 2025.
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