Cause: The read system call returned an
error.
Action: The additional information
indicates the block number. Look up the additional information returned in
your operating system manual.

Relared Errors:
ORA-06435:
ssaio: write error, unable to write requested block to database
file.
ORA-06436:
ssaio: asynchronous I/O failed due to incorrect parameters.
ORA-06437:
ssaio: the asynchronous write was unable to write to the database
file.
ORA-06438:
ssaio: the asynchronous read was unable to read from the database
file.
ORA-06439:
ssaio: the asynchronous write returned incorrect number of
bytes
ORA-06440:
ssaio: the asynchronous read returned incorrect number of
bytes
ORA-06441:
ssvwatev: Incorrect parameter passed to function call
ORA-06442:
ssvwatev: Failed with unexpected error number.
ORA-06443:
ssvpstev: Incorrect parameter passed to function call
ORA-06444:
ssvpstev: Failed with unexpected error number.