US EditionHow disk images can become sparse files
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How disk images can become sparse files
It’s no miracle that a 10 GB disk image can be shrunk down to a few MB of sparse file. This article explains how APFS works that magic, first on a normal read-write disk image, then in the disk image inside a Virtual Machine. What is a sparse file? In essence a sparse file is any file whose allocated storage is smaller than the nominal size of that file. In APFS, this imposes two requirements: the INODE_IS_SPARSE flag is set for that file’s ino…
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