can't DVD+RW blank in xcdroast-0.98alpha15?

i can write data to DVD+RW but can't DVD+RW blank
it shows below messages:

scsidev: 'ATAPI:0,1,0'
devname: 'ATAPI'
scsibus: 0 target: 1 lun: 0
Warning: Using ATA Packet interface.
Warning: The related libscg interface code is in pre alpha.
Warning: There may be fatal problems.
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'NU '
Identifikation : 'DVDRW DDW-081 '
Revision : 'BX32'
Device seems to be: Generic mmc2 DVD-ROM.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96R RAW/R16 RAW/R96R
cdrecord: Input/output error. blank unit: scsi sendcmd: no error
CDB: A1 01 00 00 00 00 00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 12 00 00 00 00 30 00 00 00 00 00 00 00 00 00 00 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x30 Qual 0x00 (incompatible medium installed) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.001s timeout 9600s

-Red Hat Enterprise Linux ES 3
-xcdroast-0.98alpha15
-nu 8xdvd+rw (ddw-081) - enhanced IDE (atapi)