-H
其中个format可以是：
‘bin’
The obsolete binary format. (2147483647 bytes)
‘odc’
The old (POSIX.1) portable format. (8589934591 bytes)
‘newc’
The new (SVR4) portable format, which supports file systems having more than 65536 i-nodes. (4294967295 bytes)
另：
-o Create (requires -H newc)
例如： cpio -o -H newc -d
转自： http://www.gnu.org/software/cpio/manual/cpio.html
http://unix.stackexchange.com/questions/118558/is-the-busybox-cpio-that-different-from-gnu-cpio