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Starting with Snow Leopard, Mac OS X supports transparent file compression on HFS+ volumes to save diskspace and reduce I/O. $ ./afsctool -v /Applications/NetBeans/NetBeans\ 6.9\ Beta.app/ /Applications/NetBeans/NetBeans 6.9 Beta.app/: Folder contains no compressed files Total number of files: 2916 Total number of folders: 210 Total number of items (number of files + number of folders): 3126 Folder size (uncompressed; reported size by Mac OS 10.6+ Finder): 220342491 bytes / 227.5 MB (megabytes) / 216.9 MiB (mebibytes) Folder size (compressed - decmpfs xattr; reported size by Mac OS 10.0-10.5 Finder): 220342491 bytes / 227.5 MB (megabytes) / 216.9 MiB (mebibytes) Folder size (compressed): 220342491 bytes / 227.5 MB (megabytes) / 216.9 MiB (mebibytes) Compression savings: 0.0% Appoximate total folder size (files + file overhead + folder overhead): 228221288 bytes / 228.2 MB (megabytes) / 217.6 MiB (mebibytes) $ ./afsctool -c /Applications/NetBeans/NetBeans\ 6.9\ Beta.app/ $ ./afsctool -v /Applications/NetBeans/NetBeans\ 6.9\ Beta.app/ /Applications/NetBeans/NetBeans 6.9 Beta.app/: Number of HFS+ compressed files: 2332 Total number of files: 2916 Total number of folders: 210 Total number of items (number of files + number of folders): 3126 Folder size (uncompressed; reported size by Mac OS 10.6+ Finder): 220342491 bytes / 227.5 MB (megabytes) / 216.9 MiB (mebibytes) Folder size (compressed - decmpfs xattr; reported size by Mac OS 10.0-10.5 Finder): 117885187 bytes / 120 MB (megabytes) / 114.4 MiB (mebibytes) Folder size (compressed): 119985046 bytes / 122.1 MB (megabytes) / 116.4 MiB (mebibytes) Compression savings: 45.5% Appoximate total folder size (files + file overhead + folder overhead): 123545803 bytes / 123.5 MB (megabytes) / 117.8 MiB (mebibytes) Please let the Netbeans IDE Installer use HFS compression. References: http://github.com/jrk/afsctool man ditto --hfsCompression When copying files or extracting content from an archive, if the destination is an HFS+ volume that supports compression, all the content will be compressed if appropriate. This is only supported on Mac OS X 10.6 or later, and is only intended to be used in installation and backup scenarios that involve system files.
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