A Raw device can be divided into 4 parts
| -------- | ---------------------------------------------------------------------------------------------------------------------------------------- ---------------- | The first part of the operating system block, such as Tru64 requires 64K, AIX needs 4K, then the second part of the OS reserved is Oracle's head, a DB_BLOCK_SIZE size (, Such as 8K) Part II is specified by Size when building TS, is also a waste of para. 4 of the Bytes field in DBA_DATA_FILES.
reference:
http://www.ccw.com.cn/htm/center/skill/02_9_3_2.asp
Http://www.itpub.net/showthread.php?s=&threadid=77726
