SQL>  alter diskgroup DATA mount;
 alter diskgroup DATA mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15131: block 417 of file 1 in diskgroup 2 could not be read
ORA-15080: synchronous I/O operation to a disk failed
ORA-27072: File I/O error
IBM AIX RISC System/6000 Error: 110: Media surface error
Additional information: 7
Additional information: 9480
Additional information: -1
ORA-27063: number of bytes read/written is incorrect
IBM AIX RISC System/6000 Error: 110: Media surface error
Additional information: -1
Additional information: 4096