RMAN backup and get bad block error messages?

we have ORACLE 11G on LINUX server. We just created a new EBS system and 
perform the database backup. When I do "cold backup" and "hot backup", there is 
NO error. While I perform RMAN backup and I got error messages:

RMAN-03009: failure of backup command on ORA_DISK_1 channel at 07/29/2009 
20:38:42
ORA-19566: exceeded limit of 0 corrupt blocks for file 
/u/EBS/EBSDB01/db/apps_st/data/system04.dbf

Alter.log also have messages:
Hex dump of (file 352, block 165656) in trace file 
/u/EBS/EBSDB01/db/tech_st/11.1.0/admin/XXX/diag/rdbms/ebsdb01/EBSDB01/trace/EBSDB01_ora_6824.trc
Corrupt block relative dba: 0x58028718 (file 352, block 165656)
Completely zero block found during backing up datafile
Reread of blocknum=165656, file=/u/EBS/EBSDB01/db/apps_st/data/system04.dbf. 
found same corrupt data


My question are:

1. Why "cold backup" and "hot backup" Not complain, but RMAN complain?

2. how to fix this bad block without lost data?

Thanks.


      
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