Don't write media

Dear all,

I install TSM 5.2 on Windows2K. 
Backup server :  xSeries 250 8665-81Y
External Storage : HP surestore optical 220mr
I have setuped ang configured succesfully. But when I backup to optical disk. I 
got error message:

        
11/15/2004 15:28:15   ANR0406I Session 43 started for node BACKUP (WinNT)       
                       (Tcp/Ip backup(1115)).                                   
                               
   
11/15/2004 15:29:07   ANR8337I OPTICAL volume VOL002 mounted in drive OP4.0.0.2 
                       (op4.0.0.2).                                             
11/15/2004 15:29:07   ANR1340I Scratch volume VOL002 is now defined in storage  
                       pool OPTPOOL1.                                           
11/15/2004 15:31:30   ANR0407I Session 126 started for administrator ADMIN      
                       (WinNT) (Tcp/Ip backup(1204)).                           
                                                 
11/15/2004 15:33:20   ANR8302E I/O error on drive OP4.0.0.2 (op4.0.0.2)         
                       (OP=WRITE, Error Number=2, CC=205, KEY=FF, ASC=FF,       
                       ASCQ=FF, SENSE=**NONE**, Description=SCSI adapter        
                       failure).  Refer to Appendix D in the 'Messages' manual  
                       for recommended action.                                  
11/15/2004 15:34:10   ANR8943E Hardware or media error on library LB3.0.0.2     
                       (OP=8401C058, CC=304, KEY=04, ASC=15, ASCQ=01,           
                       SENSE=70.00.04.00.00.00.00.46.00.00.00.00.15.01.00.00.00-
                       .00.A4.B8.14.01.00.C0.00.00.00.00.00.00.00.00.00.00.00.9-
                       0.00.01.80.00.01.00.00.00.00.00.00.00.00.00.00.00.00.00.-
                       00.00.90.00.00.0D.B3.00.00.0D.B3.00.00.34.BD.00.00.34.B2-
                       .00.00.00.00.00., Description=Changer failure).  Refer to
                       Appendix D in the 'Messages' manual for recommended      
                       action.                                                  
11/15/2004 15:34:10   ANR9999D asalloc.c(7693): ThreadId<39> Error 30 accessing 
                       volume VOL002(4), side 1.                                
11/15/2004 15:34:10   ANR1411W Access mode for volume VOL002 now set to         
                       "read-only" due to write error.                          
11/15/2004 15:34:10   ANR0523W Transaction failed for session 125 for node      
                       BACKUP (WinNT) - error on output storage device.         
11/15/2004 15:34:10   ANR0403I Session 125 ended for node BACKUP (WinNT).       

      Have anyone met this error ?