well the philips is a PDV16LSP1 there used to be no problems, i've followed the FAQ's to the letter and tryed every burn setting aswell as the auto burn function.
The writer should be able to burn the TDK at proper speed as the first time (16x) was with the same set-up as i'm using now.
here is some data that might clarify something, i used auto speed at 8x with a TDK disk
PHILIPS PBDV16LSP1 B2.0 (ATA)
Current Profile: DVD-R
Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Sectors: 2.294.912
Size: 4.699.979.776 bytes
Time: 510:00:62 (MM:SS:FF)
Supported Write Speeds: 2,4x; 4x; 8x; 16x
I 11:07:57 ImgBurn Version 2.3.2.0 started!
I 11:07:57 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 2)
I 11:07:57 Total Physical Memory: 522.240 KB - Available: 136.432 KB
I 11:07:57 Initialising SPTI...
I 11:07:57 Searching for SCSI / ATAPI devices...
I 11:07:57 Found 1 DVD-ROM, 1 DVD-ROM/CD-RW and 1 DVD±RW!
I 11:16:11 Operation Started!
I 11:16:11 Source File: *CLASSIFIED*
I 11:16:11 Source File Sectors: 2.294.912 (MODE1/2048)
I 11:16:11 Source File Size: 4.699.979.776 bytes
I 11:16:11 Source File File System(s): None
I 11:16:11 Destination Device: [1:1:0] PHILIPS PBDV16LSP1 B2.0 (E:) (ATA)
I 11:16:11 Destination Media Type: DVD-R (Disc ID: TTH02) (Speeds: 2,4x; 4x; 8x)
I 11:16:11 Destination Media Sectors: 2.298.496
I 11:16:11 Write Mode: DVD
I 11:16:11 Write Type: DAO
I 11:16:11 Write Speed: 8x
I 11:16:11 Link Size: Auto
I 11:16:11 Test Mode: No
I 11:16:11 BURN-Proof: Enabled
I 11:16:12 Filling Buffer... (100 MB)
I 11:16:16 Writing LeadIn...
I 11:16:30 Writing Image... (LBA: 0 - 2294911)
I 12:11:37 Synchronising Cache...
I 12:12:03 Image MD5: c3296b9b28f392e566c6fb6de9a3b302
I 12:12:03 Operation Successfully Completed! - Duration: 00:55:51
I 12:12:03 Average Write Rate: 1.388 KB/s (1.0x) - Maximum Write Rate: 1.613 KB/s (1.2x)