First of all open INIT<SID>.sap in notepad. path: drive:\oracle\ver<ex:10.2.0.4>\db_2\database\init<sid>.sap
Change one value DISK_TYPE to DISK and save it.
Go to Run and type BRTOOLS and you’ll step in main window.
Give your option 4 which is for backup and database copy.
then give option 1 which is for database backup
then do the following:
change the disk_type to DISK.
now go on pressing ‘c’ for continue till backup completes..
Then you are done..