Archive log Destination change

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            C:\APP\ATHIL\ADMIN\ORCL\arch
...

SQL> alter system set LOG_ARCHIVE_DEST_1='LOCATION=C:\Athil\Arch\ORCL' scope=both;
alter system set LOG_ARCHIVE_DEST_1='LOCATION=C:\Athil\Arch\ORCL' scope=both
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16019: cannot use LOG_ARCHIVE_DEST_1 with LOG_ARCHIVE_DEST or
LOG_ARCHIVE_DUPLEX_DEST


SQL> sho parameter arc

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest                     string      C:\APP\ATHIL\ADMIN\ORCL\arch

SQL> alter system set LOG_ARCHIVE_DEST='LOCATION=C:\Athil\Arch\ORCL' scope=both
  2  ;
alter system set LOG_ARCHIVE_DEST='LOCATION=C:\Athil\Arch\ORCL' scope=both
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16032: parameter LOG_ARCHIVE_DEST destination string cannot be translated
ORA-07286: sksagdi: cannot obtain device information.
Linux-x86_64 Error: 2: No such file or directory

After checking in Doc 

LOG_ARCHIVE_DEST

Property	Description
Parameter type	String
Syntax	LOG_ARCHIVE_DEST = filespec

ALTER SYSTEM SET LOG_ARCHIVE_DEST = filespec, where filespec is the new archive destination.

NO "LOCATION " for LOG_ARCHIVE_DEST

SQL> alter system set LOG_ARCHIVE_DEST='C:\Athil\Arch\ORCL' scope=both;

System altered.

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            C:\Athil\Arch\ORCL
...

SQL>  alter system switch logfile;

System altered.

SQL> /

System altered.

SQL> /

System altered.

SQL> host dir C:\Athil\Arch\ORCL

06/08/2012  10:45 AM        38,752,256 ORCL_1_137_780346113.ARC
06/08/2012  10:45 AM             1,024 ORCL_1_138_780346113.ARC
06/08/2012  10:45 AM             3,072 ORCL_1_139_780346113.ARC