![]() When the content of the image changes, one or more band files is changed, created, or deleted. As of Mac OS X 10.8, the bands are 8 MiB ( 8 × 1024 2 byte) each. ![]() This means even though to the end user the sparse bundle appears as a single file, it is composed of smaller files. Instead of a single big file, a sparse bundle is a bundle (directory) containing a number of files called bands, each on the order of 8 MB in size. Mac OS X Leopard introduced the concept of the sparse bundle. sparseimage image files automatically expand to their preassigned limit when data is added, they cannot be arbitrarily resized without the use of Disk Utility, hdiutil, or other such software. sparseimage file must first be moved to a larger physical disk or partition. While the virtual volume will seem to make that capacity available, attempting to exceed the physical capacity of the underlying volume will result in a disk error: "ran out of space". ![]()
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