объясните про dd

[octy@xrprint ~]$ cat bootdisk-cl1.tar.bz2 | dd bs=64k count=1 > /tmp/yyy
1+0 records in
1+0 records out
65536 bytes (66 kB) copied, 0.003435 seconds, 19.1 MB/s
[octy@xrpro ~]$ ls -l /tmp/yyy
-rw-r--r-- 1 octy users 65536 Sep 18 20:22 /tmp/yyy
[octy@xrprint ~]$ cat bootdisk-cl1.tar.bz2 | dd bs=65536 count=1 > /tmp/yyy
1+0 records in
1+0 records out
65536 bytes (66 kB) copied, 0.003091 seconds, 21.2 MB/s
[octy@xrprint ~]$ ls -l /tmp/yyy
-rw-r--r-- 1 octy users 65536 Sep 18 20:22 /tmp/yyy
[octy@xrpro ~]$ dd --version
dd (coreutils) 5.94
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>;.
There is NO WARRANTY, to the extent permitted by law.

Written by Paul Rubin, David MacKenzie, and Stuart Kemp.

------------------

так что вроде все нормально. Версия dd какая?

$ dd --version
dd (coreutils) 4.5.3
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.

Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[dlagno@deliver dlagno]$ cat /etc/redhat-release 
Red Hat Linux release 9 (Shrike)