Sorry, I made an mistake! We use Oralce8.0.4 on HP. The errors like below:
....
. . exporting table SITE 4 rows exported
. . exporting table SITESECURITY 0 rows exported
. . exporting table SOURCETOIMAGE 0 rows exported
. . exporting table STREAMDATA
EXP-00002: error in writing to export file
EXP-00222:
System error message 27
EXP-00002: error in writing to export file
EXP-00000: Export terminated unsuccessfully

help, thanks!