1Transparent decompression (-z option) is available on Linux kernels 2using kernel version 2.4.14 or 2.4.9-ac14 or later. 3 4You also need the zisofs-tools package, containing the mkzftree 5utility, to create the compressed files; this package is available at: 6 7ftp://ftp.kernel.org/pub/linux/utils/fs/zisofs/ 8 9The mkzftree utility can also be used to read compressed CD-ROMs on 10systems which do not support transparent decompression. 11 12The use of a separate utility allows compression to be controlled on a 13per-file basis. A file which is not compressed can be read on any 14system. 15 16Transparent decompression is implemented as an extension to Rock 17Ridge, so Rock Ridge needs to be enabled (-R or -r options.) 18