oracle spfile and pfile

startup using spfile
STARTUP

startup using pfile
STARTUP PFILE=’C:\oracle\product\10.2.0\admin\MarlonDB\initMarlonDB01.ora’

convert one to another:
CREATE SPFILE=’C:\oracle\product\10.2.0\db_1\database\spfileMarlonDB01.ora’ FROM PFILE=’C:\oracle\product\10.2.0\admin\MarlonDB\initMarlonDB01.ora’;

CREATE PFILE=’C:\oracle\product\10.2.0\admin\MarlonDB\initMarlonDB01.ora’ FROM SPFILE=’C:\oracle\product\10.2.0\db_1\database\spfileMarlonDB01.ora’;