Pioneer DVR-A03 problem

[Jack Ciao]

Hi,         Recently, I restart to work on my burner program. I plan to add DVD-RW support to my program. But I met a strange problem about the "write(10)" command.       I found that DVR-A03 will fail to write data at some positions. I try to observe log generated by the dvd-rw patch for cdrtools-1.11a08 by Nicolae Mihalache. It seems the following command will be retried about 697 times.   Executing 'write_g1' command on Bus 0 Target 1, Lun 0 timeout 200s CDB:  2A 00 00 00 02 6C 00 00 1F 00 Sending 63488 (0xF800) bytes of data. Write Data:  00 00 01 BA 44 00 45 2B A6 03 01 89 C3 F8 00 00 01 E0 07 EC 81 00 00 EF BF 23 2B 10 2C A4 DC 35 04 13 00 E4 E4 D4 7E 8F B8 04 3D 94 47 89 5D FA 52 46 CD 96 26 B7 06 E2 6A 3A 46 93 DF C9 18 67 A8 37 E2 F0 1D 7B 52 4D 47 DD F1 39 A5 4A BA B9 3A D3 86 10 93 D2 90 FD DD 4A 10 6D 57 CC 8E 31 67 8F EE 06 ioctl ret: 0 host_status: 00 driver_status: 28 ./cdrecord: Input/output error. write_g1: scsi sendcmd: no error CDB:  2A 00 00 00 02 6C 00 00 1F 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 02 00 00 00 00 0E 00 00 00 00 04 08 00 00 Sense Key: 0x2 Not Ready, Segment 0 Sense Code: 0x04 Qual 0x08 (logical unit not ready, long write in progress) Fru 0x0 Sense flags: Blk 0 (not valid) cmd finished after 0.006s timeout 200s     After 697 times retry, DVR-A03 will write the 0x1F sector at 0x026C successfully. I remember some other cdrw drive have the same behavior (Yamaha 2100 and 2200). Is there anyway to avoid this? Or I have to retry the command until it success?   But while I try to let my program retry until the "write" command successful. It will be failed after hundreds times with   FAIL!!! CDB: 2A  0  0  0  2 6C  0  0 1F  0 ?: Input/output error.  : scsi sendcmd: no error CDB:  2A 00 00 00 02 6C 00 00 1F 00 status: 0x2 (CHECK CONDITION) Sense Bytes: 70 00 05 00 00 00 00 0E 00 00 00 00 21 02 00 00 Sense Key: 0x5 Illegal Request, Segment 0 Sense Code: 0x21 Qual 0x02 (logical block address out of range) [No matching qualifier] Fru 0x0 Sense flags: Blk 0 (not valid) cmd finished after 0.005s timeout 20s   Why? I retry to write the same address but fail with "INVALID ADDRESS FOR WRITE"? Is there anybody can tell me why? Or how to avoid this?     Jack Ciao