After I made the original post, I burned another CD to pay closer attention to what was going on. The verify took about 15 minutes. I found that for almost the entire verify, the rate was 4x. Then for the last ten seconds, the speed jumped up. The log is posted below. It includes creating an ISO image from an original, burning the ISO to disc and the automatic verify.
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I 14:26:45 Operation Started!
I 14:26:45 Source Device: [1:1:0] HL-DT-ST DVDRAM GSA-4163B A106 (R:) (ATA)
I 14:26:45 Source Media Type: CD-ROM
I 14:26:45 Source Media Sectors: 318,781
I 14:26:45 Source Media Volume Identifier: Data
I 14:26:45 Source Media Application Identifier: TOAST ISO 9660 BUILDER COPYRIGHT © 1997 ADAPTEC, INC. - HAVE A NICE DAY
I 14:26:45 Source Media File System(s): ISO9660, Joliet
I 14:26:45 Destination File: C:\disc.iso
I 14:26:45 Destination Free Space: 16,912,826,368 bytes (16,516,432 KB) (16,129 MB) (15 GB)
I 14:26:45 Destination File System: NTFS
I 14:26:45 File Splitting: Auto
I 14:26:45 Reading Sectors... (LBA: 0 - 318780)
I 14:29:10 Image MD5: da0a2111b974aea0ce38fc534de275e1
I 14:29:10 Operation Successfully Completed! - Duration: 00:02:24
I 14:29:10 Average Read Rate: 4,427 KB/s (29.5x) - Maximum Read Rate: 6,205 KB/s (41.4x)
I 14:29:50 Operation Started!
I 14:29:50 Source File: C:\disc.iso
I 14:29:50 Source File Sectors: 318,781 (MODE1/2048)
I 14:29:50 Source File Size: 652,863,488 bytes
I 14:29:50 Source File Volume Identifier: Data
I 14:29:50 Source File Application Identifier: TOAST ISO 9660 BUILDER COPYRIGHT © 1997 ADAPTEC, INC. - HAVE A NICE DAY
I 14:29:50 Source File File System(s): ISO9660, Joliet
I 14:29:50 Destination Device: [1:1:0] HL-DT-ST DVDRAM GSA-4163B A106 (R:) (ATA)
I 14:29:50 Destination Media Type: CD-RW (Disc ID: 97m34s22f) (Speeds: 4x)
I 14:29:50 Destination Media Sectors: 336,073
I 14:29:50 Write Mode: CD
I 14:29:50 Write Type: SAO
I 14:29:50 Write Speed: MAX
I 14:29:50 Test Mode: No
I 14:29:50 BURN-Proof: Enabled
I 14:29:50 Filling Buffer... (20 MB)
I 14:29:51 Writing LeadIn...
I 14:30:33 Writing Image... (LBA: 0 - 318780)
I 14:48:13 Synchronising Cache...
I 14:48:39 Image MD5: da0a2111b974aea0ce38fc534de275e1
I 14:48:39 Operation Successfully Completed! - Duration: 00:18:48
I 14:48:39 Average Write Rate: 601 KB/s (4.0x) - Maximum Write Rate: 615 KB/s (4.1x)
I 14:48:39 Operation Started!
I 14:48:39 Source Device: [1:1:0] HL-DT-ST DVDRAM GSA-4163B A106 (R:) (ATA)
I 14:48:39 Source Media Type: CD-RW (Disc ID: 97m34s22f) (Speeds: 4x)
I 14:48:39 Image File: C:\disc.iso
I 14:48:39 Image File Sectors: 318,781 (MODE1/2048)
I 14:48:39 Image File Size: 652,863,488 bytes
I 14:48:39 Image File Volume Identifier: Data
I 14:48:39 Image File Application Identifier: TOAST ISO 9660 BUILDER COPYRIGHT © 1997 ADAPTEC, INC. - HAVE A NICE DAY
I 14:48:39 Image File File System(s): ISO9660, Joliet
I 14:48:39 Verifying Sectors... (LBA: 0 - 318780)
I 15:03:34 Device MD5: da0a2111b974aea0ce38fc534de275e1
I 15:03:34 Image MD5: da0a2111b974aea0ce38fc534de275e1
I 15:03:34 Operation Successfully Completed! - Duration: 00:14:55
I 15:03:34 Average Verify Rate: 712 KB/s (4.7x) - Maximum Verify Rate: 6,307 KB/s (42.0x)