The ramdisk-based miniroot is packed and unpacked by the root_archive command. Note that only SPARC based systems that support the new boot architecture have the ability to pack and unpack a compressed version of the miniroot.
The Solaris Express version of the root_archive tool is not compatible with the Solaris 10 version of the tool. Therefore, ramdisk manipulation should only be performed on a system that is running the same Solaris release as the archives.
For more information about packing and unpacking the miniroot, see the root_archive(1M) man page.