Fix the case "board has single invalid entry".


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6061 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
postd: Correct transfer data size and revise output messages.


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6062 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
post/rebuild: Improve disk I/O sequence and speed.


git-svn-id: http://opensvn.csie.org/pttbbs/trunk@6063 63ad8ddf-47c3-0310-b6dd-a9e9d9715204