i googled this. this looks like a hardware issue right? ERROR at line 1: ORA-01115: IO error reading block from file 12 (block # 546933) ORA-01110: data file 12: 'C:\ORACLE\PRODUCT\10.2.0\ORADATA\CCDEV\USERS02.DBF' ORA-27091: unable to queue I/O ORA-27070: async read/write failed OSD-04006: ReadFile() failure, unable to read from file O/S-Error: (OS 121) The semaphore timeout period has expired. ORA-06512: at "SYS.DBMS_REPAIR", line 293 ORA-06512: at line 1