I downloaded the SeaTools for DOS and that burned successfully -
I 10:26:04 ImgBurn Version 2.5.7.0 started!
I 10:26:04 Microsoft Windows 7 Home Premium x64 Edition (6.1, Build 7601 : Service Pack 1)
I 10:26:04 Total Physical Memory: 7,974,540 KB - Available: 5,539,388 KB
I 10:26:04 Initialising SPTI...
I 10:26:04 Searching for SCSI / ATAPI devices...
I 10:26:06 -> Drive 1 - Info: HL-DT-ST DVDRAM GT51N SB02-11 (E:) (SATA)
I 10:26:06 Found 1 DVD±RW/RAM!
I 10:27:13 Operation Started!
I 10:27:13 Source File: C:\Users\Bruv26\Downloads\SeaToolsDOS223ALL.ISO
I 10:27:13 Source File Sectors: 4,330 (MODE1/2048)
I 10:27:13 Source File Size: 8,867,840 bytes
I 10:27:13 Source File Volume Identifier: SEAGATE
I 10:27:13 Source File Application Identifier: SeaTools for DOS
I 10:27:13 Source File File System(s): ISO9660 (Bootable), Joliet
I 10:27:13 Destination Device: [0:0:0] HL-DT-ST DVDRAM GT51N SB02 (E:) (SATA)
I 10:27:13 Destination Media Type: DVD-R (Disc ID: RITEKF1)
I 10:27:13 Destination Media Supported Write Speeds: 4x, 8x
I 10:27:13 Destination Media Sectors: 2,297,888
I 10:27:13 Write Mode: DVD
I 10:27:13 Write Type: DAO
I 10:27:14 Write Speed: MAX
I 10:27:14 Link Size: Auto
I 10:27:14 Lock Volume: Yes
I 10:27:14 Test Mode: No
I 10:27:14 OPC: No
I 10:27:14 BURN-Proof: Enabled
I 10:27:14 Write Speed Successfully Set! - Effective: 11,080 KB/s (8x)
I 10:27:15 Filling Buffer... (80 MB)
I 10:27:15 Writing LeadIn...
I 10:27:33 Writing Session 1 of 1... (1 Track, LBA: 0 - 4329)
I 10:27:33 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 4329)
I 10:27:35 Synchronising Cache...
I 10:31:22 Exporting Graph Data...
I 10:31:22 Graph Data File: C:\Users\Bruv26\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_DVDRAM_GT51N_SB02_16-MARCH-2016_10-27_RITEKF1_MAX.ibg
I 10:31:22 Export Successfully Completed!
I 10:31:22 Operation Successfully Completed! - Duration: 00:04:08
I 10:31:22 Average Write Rate: 8,660 KB/s (6.3x) - Maximum Write Rate: 8,660 KB/s (6.3x)
I 10:31:22 Cycling Tray before Verify...
W 10:31:37 Waiting for device to become ready...
I 10:31:53 Device Ready!
I 10:31:56 Operation Started!
I 10:31:56 Source Device: [0:0:0] HL-DT-ST DVDRAM GT51N SB02 (E:) (SATA)
I 10:31:56 Source Media Type: DVD-R (Book Type: DVD-R) (Disc ID: RITEKF1)
I 10:31:56 Source Media Supported Write Speeds: 4x, 8x
I 10:31:56 Image File: C:\Users\Bruv26\Downloads\SeaToolsDOS223ALL.ISO
I 10:31:56 Image File Sectors: 4,330 (MODE1/2048)
I 10:31:56 Image File Size: 8,867,840 bytes
I 10:31:56 Image File Volume Identifier: SEAGATE
I 10:31:56 Image File Application Identifier: SeaTools for DOS
I 10:31:56 Image File File System(s): ISO9660 (Bootable), Joliet
I 10:31:56 Read Speed (Data/Audio): MAX / MAX
I 10:31:57 Verifying Session 1 of 1... (1 Track, LBA: 0 - 4329)
I 10:31:57 Verifying Track 1 of 1... (MODE1/2048, LBA: 0 - 4329)
I 10:32:05 Exporting Graph Data...
I 10:32:05 Graph Data File: C:\Users\Bruv26\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_DVDRAM_GT51N_SB02_16-MARCH-2016_10-27_RITEKF1_MAX.ibg
I 10:32:05 Export Successfully Completed!
I 10:32:05 Operation Successfully Completed! - Duration: 00:00:08
I 10:32:05 Average Verify Rate: 1,237 KB/s (0.9x) - Maximum Verify Rate: 1,237 KB/s (0.9x)
What size of disc are you using - I use a 4GB -R DVD and the ISO is showing as 8,660KBs in my Win 7 Downloads folder.
Is the ISO file the same size for you ?