Any clue on why?
I 19:02:43 ImgBurn Version 2.5.1.0 started! I 19:02:43 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2) I 19:02:43 Total Physical Memory: 1,048,048 KB - Available: 488,500 KB W 19:02:43 Duplex Secure's SPTD driver can have a detrimental effect on drive performance. I 19:02:43 Initialising SPTI... I 19:02:43 Searching for SCSI / ATAPI devices... I 19:02:43 -> Drive 1 - Info: HL-DT-ST DVDRAM GSA-4081B A100 (D:) (ATA) I 19:02:43 -> Drive 2 - Info: HL-DT-ST DVD-ROM GDR8161B 0100 (E:) (ATA) I 19:02:43 Found 1 DVD-ROM and 1 DVD±RW/RAM! I 19:02:47 Operation Started! I 19:02:47 Source File: C:\Documents and Settings\Keng\My Documents\Downloads\Windows Vista x64 Recovery Disc.iso I 19:02:47 Source File Sectors: 76,051 (MODE1/2048) I 19:02:47 Source File Size: 155,752,448 bytes I 19:02:47 Source File Volume Identifier: 2008.03.29_2201 I 19:02:47 Source File Volume Set Identifier: 2008.03.29_2201 I 19:02:47 Source File Implementation Identifier: Microsoft IMAPI v1.0 I 19:02:47 Source File File System(s): ISO9660 (Bootable), Joliet, UDF (1.02) I 19:02:47 Destination Device: [5:0:0] HL-DT-ST DVDRAM GSA-4081B A100 (D:) (ATA) I 19:02:47 Destination Media Type: DVD-RW (Disc ID: CMCW03) (Speeds: 0.5x, 4x) I 19:02:47 Destination Media Sectors: 2,298,496 I 19:02:47 Write Mode: DVD I 19:02:47 Write Type: DAO I 19:02:47 Write Speed: 1x I 19:02:47 Link Size: Auto I 19:02:47 Lock Volume: Yes I 19:02:47 Test Mode: No I 19:02:47 OPC: No I 19:02:47 BURN-Proof: Enabled I 19:02:48 Write Speed Successfully Set! - Effective: 1,385 KB/s (1x) E 19:02:49 Failed to Reserve Track! - Reason: Cannot Write Medium - Incompatible Format E 19:02:50 Operation Failed! - Duration: 00:00:02 I 19:02:50 Average Write Rate: N/A - Maximum Write Rate: N/A [/Code]