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Thanks for the replies. Ok tried x2.4 and full erase but still the same. I then tried another disc and it was the same then another, however this time it worked with no errors. Its the same brand/make of disc so not sure why it burned ok this time but i guess as they say 3rd time lucky!

Just tried to burn a bootable Windows repair disc but encountered lots of errors so not sure if its the drive or the burn? I 21:51:59 ImgBurn Version 2.5.6.0 started! I 21:51:59 Microsoft Windows 7 Ultimate x64 Repair Disc I 21:51:59 Total Physical Memory: 4,192,760 KB - Available: 3,054,788 KB I 21:51:59 Initialising SPTI... I 21:51:59 Searching for SCSI / ATAPI devices... I 21:51:59 -> Drive 1 - Info: HL-DT-ST DVDRAM GH22NS50 TN02-01 (J:) (ATA) I 21:51:59 Found 1 DVD±RW/RAM! I 21:52:17 Operation Started! I 21:52:17 Device: [0:0:0] HL-DT-ST DVDRAM GH22NS50 TN02 (J:) (ATA) I 21:52:17 Media Type: DVD+RW (Disc ID: MKM-A02-00) I 21:52:17 Media Supported Write Speeds: 2.4x, 4x I 21:52:17 Quick Erase: No I 21:52:17 Format Properly: Yes I 21:52:17 Format Size: Preferred I 21:52:17 Erasing Disc... I 22:08:20 Operation Successfully Completed! - Duration: 00:16:02 I 22:08:27 Operation Started! I 22:08:27 Source File: C:\Users\James\Downloads\Microsoft Windows 7 Ultimate x64 Repair Disc.iso I 22:08:27 Source File Sectors: 1,823,885 (MODE1/2048) I 22:08:27 Source File Size: 3,735,316,480 bytes I 22:08:27 Source File Volume Identifier: CD_ROM I 22:08:27 Source File Volume Set Identifier: CD_ROM I 22:08:27 Source File Application Identifier: OSCDIMG 2.55 (01/01/2005 TM) I 22:08:27 Source File File System(s): ISO9660 (Bootable) I 22:08:27 Destination Device: [0:0:0] HL-DT-ST DVDRAM GH22NS50 TN02 (J:) (ATA) I 22:08:27 Destination Media Type: DVD+RW (Disc ID: MKM-A02-00) I 22:08:27 Destination Media Supported Write Speeds: 2.4x, 4x I 22:08:27 Destination Media Sectors: 2,295,104 I 22:08:27 Write Mode: DVD I 22:08:27 Write Type: DAO I 22:08:27 Write Speed: MAX I 22:08:27 Link Size: Auto I 22:08:28 Lock Volume: Yes I 22:08:28 Test Mode: No I 22:08:28 OPC: No I 22:08:28 BURN-Proof: Enabled I 22:08:31 Write Speed Successfully Set! - Effective: 5,540 KB/s (4x) I 22:08:31 Book Type Setting: N/A I 22:08:32 Filling Buffer... (40 MB) I 22:08:32 Writing LeadIn... I 22:08:33 Writing Session 1 of 1... (1 Track, LBA: 0 - 1823884) I 22:08:33 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 1823884) I 22:19:46 Synchronising Cache... W 22:19:47 Potential 'WaitImmediateIO' Deferred Error - (2/3) - Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:47 Synchronise Cache Failed! - Reason: Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:47 Retrying (1 of 3)... W 22:19:48 Potential 'WaitImmediateIO' Deferred Error - (0/3) - Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:48 Retry Failed - Reason: Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:48 Retrying (2 of 3)... W 22:19:49 Potential 'WaitImmediateIO' Deferred Error - (0/3) - Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:49 Retry Failed - Reason: Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:49 Retrying (3 of 3)... W 22:19:50 Potential 'WaitImmediateIO' Deferred Error - (0/3) - Unknown (ASC: 0x90, ASCQ: 0x80) W 22:19:50 Retry Failed - Reason: Unknown (ASC: 0x90, ASCQ: 0x80) I 22:20:01 Closing Session... I 22:20:02 Exporting Graph Data... I 22:20:02 Graph Data File: C:\Users\James\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_DVDRAM_GH22NS50_TN02_20-MARCH-2012_22-08_MKM-A02-00_MAX.ibg I 22:20:02 Export Successfully Completed! I 22:20:02 Operation Successfully Completed! - Duration: 00:11:34 I 22:20:02 Average Write Rate: 5,428 KB/s (3.9x) - Maximum Write Rate: 5,693 KB/s (4.1x) I 22:20:02 Cycling Tray before Verify... W 22:20:11 Waiting for device to become ready... I 22:20:36 Device Ready! I 22:20:39 Operation Started! I 22:20:39 Source Device: [0:0:0] HL-DT-ST DVDRAM GH22NS50 TN02 (J:) (ATA) I 22:20:39 Source Media Type: DVD+RW (Book Type: DVD+RW) (Disc ID: MKM-A02-00) I 22:20:39 Source Media Supported Write Speeds: 2.4x, 4x I 22:20:39 Image File: C:\Users\James\Downloads\Microsoft Windows 7 Ultimate x64 Repair Disc.iso I 22:20:39 Image File Sectors: 1,823,885 (MODE1/2048) I 22:20:39 Image File Size: 3,735,316,480 bytes I 22:20:39 Image File Volume Identifier: CD_ROM I 22:20:39 Image File Volume Set Identifier: CD_ROM I 22:20:39 Image File Application Identifier: OSCDIMG 2.55 (01/01/2005 TM) I 22:20:39 Image File File System(s): ISO9660 (Bootable) I 22:20:39 Read Speed (Data/Audio): MAX / MAX I 22:20:40 Verifying Session 1 of 1... (1 Track, LBA: 0 - 1823884) I 22:20:40 Verifying Track 1 of 1... (MODE1/2048, LBA: 0 - 1823884) W 22:21:26 Failed to Read Sector 1552 - Reason: Unrecovered Read Error W 22:21:26 Sector 1552 maps to File: \BOOT\BOOT.SDI W 22:22:37 Failed to Read Sector 1552 - Reason: Unrecovered Read Error W 22:22:37 Sector 1552 maps to File: \BOOT\BOOT.SDI W 22:22:46 Failed to Read Sector 1553 - Reason: Unrecovered Read Error W 22:22:46 Sector 1553 maps to File: \BOOT\BOOT.SDI E 22:22:47 Failed to Read Sector 1553 - Reason: Unrecovered Read Error E 22:22:47 Sector 1553 maps to File: \BOOT\BOOT.SDI E 22:22:48 Failed to Verify Sectors! I 22:22:49 Exporting Graph Data... I 22:22:49 Graph Data File: C:\Users\James\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_DVDRAM_GH22NS50_TN02_20-MARCH-2012_22-08_MKM-A02-00_MAX.ibg I 22:22:49 Export Successfully Completed! E 22:22:49 Operation Failed! - Duration: 00:02:08 I 22:22:49 Average Verify Rate: 24 KB/s (0.0x) - Maximum Verify Rate: 32 KB/s (0.0x)