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I tried with newer firmware but it still not work I think is better to use 8x speed

Hello, I have problems when burning with SONY DVD-R 16x media, at full speed. After I have failed for 5 times, I tried to change my burning speed to 8x and it is works fine. Is this the media problems or my DVD-RW ? This is the error log I 11:28:58 ImgBurn Version 2.3.2.0 started! I 11:28:58 Microsoft Windows Vista Ultimate Edition (6.0, Build 6000) I 11:28:58 Total Physical Memory: 1,276,864 KB - Available: 665,856 KB I 11:28:58 Initialising SPTI... I 11:28:58 Searching for SCSI / ATAPI devices... I 11:28:58 Found 1 DVD-ROM and 1 DVD±RW! I 11:29:06 Operation Started! I 11:29:06 Source File: G:\PSTS\pstsb.iso I 11:29:06 Source File Sectors: 2,238,271 (MODE1/2048) I 11:29:06 Source File Size: 4,583,979,008 bytes I 11:29:06 Source File Volume Identifier: pstsb I 11:29:06 Source File Implementation Identifier: Microsoft IMAPI v1.0 I 11:29:06 Source File File System(s): UDF (1.02) I 11:29:06 Destination Device: [1:0:0] PIONEER DVD-RW DVR-111D 1.23 (D:) (ATA) I 11:29:06 Destination Media Type: DVD-R (Disc ID: SONY16D1) (Speeds: 4x, 6x, 8x, 12x, 16x) I 11:29:06 Destination Media Sectors: 2,297,888 I 11:29:06 Write Mode: DVD I 11:29:06 Write Type: DAO I 11:29:06 Write Speed: MAX I 11:29:06 Link Size: Auto I 11:29:06 Test Mode: No I 11:29:06 BURN-Proof: Enabled I 11:29:06 Filling Buffer... (40 MB) I 11:29:07 Writing LeadIn... I 11:29:49 Writing Image... (LBA: 0 - 2238270) W 11:33:43 Failed to Write Sectors 1508000 - 1508031 - Write Error W 11:33:43 Retrying (1 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (2 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (3 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (4 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (5 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (6 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (7 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (8 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (9 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (10 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (11 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (12 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (13 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (14 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (15 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (16 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (17 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (18 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (19 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format W 11:33:43 Retrying (20 of 20)... W 11:33:43 Retry Failed - Cannot Write Medium - Incompatible Format E 11:33:59 Failed to Write Sectors 1508000 - 1508031 - Write Error I 11:33:59 Synchronising Cache... E 11:34:00 Failed to Write Image! E 11:34:04 Operation Failed! - Duration: 00:04:54 I 11:34:04 Average Write Rate: 12,112 KB/s (8.7x) - Maximum Write Rate: 18,840 KB/s (13.6x) I 11:34:31 Close Request Acknowledged I 11:34:31 Closing Down... I 11:34:31 Shutting down SPTI... I 11:34:31 ImgBurn closed! Thanks