problem creating disk group in 10g

Hi friends ,

I am able to see empty disk in disk management .
but oracle is not identofying this diskgroup thorugh asm .

please et me know what i am missing .

SQL> create diskgroup dg1 external redundancy disk 'SPAR:DISK1' ;
create diskgroup dg1 external redundancy disk 'SPAR:DISK1'
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification 'SPAR:DISK1' matches no disks
ORA-15056: additional error message
OSD-04659: Message 4659 not found; product=RDBMS; facility=SOSD
O/S-Error: (OS 123) The filename, directory name, or volume label syntax is
incorrect.

operating system is windows 2003 server'

thanks

Have you ASM-stamped those disks (asmtool.exe or asmtoolg.exe)?

do i need to run these tool

just now i ran asmtool.exe it ran and then exit

then i doubleclicked asmtoolg.exe

i see only one NTFS disk partition that need to be stamped . but my raw disk of 135GB is not visible.

which i see in disk management

disk which i see is something like DEVICE/hARDdISK1/PARTITION1

do i need to do any partition or assign a logical name for this raw disk ..

can i create a diskgroup with just one disk ...

for some reason this is not enabled