Afsctool Hfs Compression For Mac
I'm trying to decompress a Mach-O binary which has been compressed using one of the compression algorithms in Mac 10.10's HFS+ implementation. Basically the file has the 'com.apple.decmpfs' attribute on it, which says that it is compression type 8. Then the compressed contents of the file are stored in the file's resource fork. Afsctool AFSC (Apple File System Compression) tool is an utility that can be used to apply HFS+ compression to file (s), decompress HFS+ compressed file (s), or get information about existing HFS+ compressed file (s). Mac OS 10.6 or later is required. Latest version is 1.6.4 (build 34).
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In the past, when Sky Drive was first created, the SkyDrive Sync Folder on my Computer was compressed via NTFS volume compression and once that happened, my files in SkyDrive got corrupted and I had to restore from a local backup. I dealt with MSFT Pro-Support who ultimately confirmed this to be a bug and fixed it, but the damage was already done when I lost all my files. Prior to the bug, if the NTFS volume was not compressed, everything was fine, but once the volume on which the SkyDrive Sync folder sat was compressed, the corruption would occur once the files synchronized.
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I need to avoid experiencing that problem with OneDrive and HFS+ volume compression so I need an official statement from Microsoft confirming the problem doesn't exist or stating it might exist and they have to test and certify the situation first, before guaranteeing full compatibility.
Afsctool Hfs Compression For Mac Computers
Oct 7, 2015 12:38 PM
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OSX Leopard 10.5 and Snow Leopard 10.6 bring a new element to Apple's venerable filing system, HFS.They introduced a near seamless and transparent feature called HFS Compression where file are transparently compressed on disk, and then de-compressed into RAM as they are loaded.
Basically in the days of super fast CPUs and huge RAM its a tradeoff between disk I/O and other system constraints.
You could also say that it helps Apple offer laptops with smaller SSDs than their platter equivalents because regular files take up typically only about 50% of the space.
OSX manages the compression for system files and applications and speeds loading times because the disk I/O CPU tradeoff is favourable.
What about other files? Well you can play too. There are three options:
- Clusters which is a nice GUI built on Apple's compression technologies. It offers background compression, pausing and other nice features.
- Ditto, the file command line management utility can create HFS Compressed files
- afsctool also allows you to manage file compression, and to report on the results.
Afsctool Hfs Compression For Mac Os
Here are some afstool tips:
printout afsctool options and switches
$ afsctool > afsctool.txt
compress a directory:
afsctool -c ~/directory
compress a file:
afsctool -c ~/directory/file.txt
report which files are not compressed:
afsctool -c -l ~/directory
confirm the results of compressing:
afsctool -v ~/directory
the command I use with some useful extra switches:
afsctool -c -m 5242880 -s 5 ~/directory
the '-m' sets the size of the largest file to be compressed. Since the uncompressed file must be held in RAM, there is a tradeoff here. Its the size in bytes, so 5242880 bytes = 5MB. 10485760 = 10MB.
The -s' sets the minimum percentage that must be saved by compressing. The stops you compressing files for which there is no benefit eg media files, jpegs, zips and rars.
Here's the result of compressing a directory of old files:
/Users/directory:
Number of HFS+ compressed files: 87
Total number of files: 98
Total number of folders: 10
Total number of items (number of files + number of folders): 108
Folder size (uncompressed; reported size by Mac OS 10.6+ Finder): 34519979 bytes / 34.8 MB (megabytes) / 33.2 MiB (mebibytes)
Folder size (compressed - decmpfs xattr; reported size by Mac OS 10.0-10.5 Finder): 27890264 bytes / 28.1 MB (megabytes) / 26.8 MiB (mebibytes)
Folder size (compressed): 27902203 bytes / 28.1 MB (megabytes) / 26.8 MiB (mebibytes)
Compression savings: 19.2%
Approximate total folder size (files + file overhead + folder overhead): 28242154 bytes / 28.2 MB (megabytes) / 26.9 MiB (mebibytes)
So I'm saving overall about 20% of the space required which isn't bad for a directory that contains a lot of images and PDFs.
Handily, HFS Compression being very low level plays nicely with pretty much everything else except anything to do with developer tools - for some reason it really doesn't like compressing .c source code files.
So you can combine this with Dropbox to save some local space for all those important files that you don't need very often.