You can not use NTFS share drive in RAC. If you want to use such disk, you need to delete that partition and create new partition, then cerate a logical drive (do not format it and do not assign a letter to it). Once this is done use asmtoolg command to stamp it as an asm disk. After this you can add this disk to any ASM disk group that you have. If you do not want to use ASM then you need to format this disk using OCFS or any other cluster file system but not NTFS.
