This is the log file. I selected 2.4x for the burn speed and the actual burn speed is 4x (which I think is limited by the media). The reason I want to slow it down is because she is using photoshop while burning and the disk throughput gets maxed out while burning and slows the response to photoshop. We'd rather a slower burn than slowing down photoshop.
I 11:18:43 ImgBurn Version 188.8.131.52 started!
I 11:18:43 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 2)
I 11:18:43 Total Physical Memory: 2,085,992 KB - Available: 1,262,380 KB
W 11:18:43 Drive I:\ (FAT32) does not support single files > 4 GB in size.
I 11:18:43 Initialising SPTI...
I 11:18:43 Searching for SCSI / ATAPI devices...
I 11:18:43 Found 1 DVD±RW!
I 11:22:48 Operation Started!
I 11:22:48 Building Image Tree...
I 11:22:54 Checking Directory Depth...
I 11:22:54 Calculating Totals...
I 11:22:54 Preparing Image...
I 11:22:54 Checking Path Length...
I 11:22:54 Image Size: 1,019,674,624 bytes
I 11:22:54 Image Sectors: 497,888
I 11:22:58 Operation Successfully Completed! - Duration: 00:00:09
I 11:22:58 Operation Started!
I 11:22:58 Source File: -==/\/[bUILD IMAGE]\/\==-
I 11:22:58 Source File Sectors: 497,888 (MODE1/2048)
I 11:22:58 Source File Size: 1,019,674,624 bytes
I 11:22:58 Source File Volume Identifier: MHS Girls Cross Country
I 11:22:58 Source File Application Identifier: IMGBURN V184.108.40.206 - THE ULTIMATE IMAGE BURNER!
I 11:22:58 Source File Implementation Identifier: ImgBurn
I 11:22:58 Source File File System(s): ISO9660, UDF (1.02)
I 11:22:58 Destination Device: [1:0:0] HL-DT-ST DVD+-RW GSA-H73N B103 (D:) (ATA)
I 11:22:58 Destination Media Type: DVD-R (Disc ID: RITEKF1) (Speeds: 4x, 8x, 12x, 16x)
I 11:22:58 Destination Media Sectors: 2,298,496
I 11:22:58 Write Mode: DVD
I 11:22:58 Write Type: DAO
I 11:22:58 Write Speed: 2.4x
I 11:22:58 Link Size: Auto
I 11:22:58 Test Mode: No
I 11:22:58 BURN-Proof: Enabled
I 11:22:58 Filling Buffer... (40 MB)
I 11:23:00 Writing LeadIn...
I 11:23:13 Writing Image... (LBA: 0 - 497887)
I 11:26:18 Synchronising Cache...
I 11:27:01 Image MD5: 9d58bea19c72e3a0ebef5b5b8ce7c78c
I 11:27:01 Operation Successfully Completed! - Duration: 00:04:03
I 11:27:01 Average Write Rate: 5,411 KB/s (3.9x) - Maximum Write Rate: 5,618 KB/s (4.1x)
EDIT: Just saw that 4x is the slowest supported speed. Sorry. That should be slow enough. Thanks for the help.