Bad results with the following media:
(silly me expected the product to work on any standard media since there's no mention of "supported media only" on the box and I purchased a spindle of these)

Brand name: Laser 4x
Media type: DVD-R
MID code: AML
Firmware used: V0043
Burn software used: Nero 5.5.10.33 (Bundled with burner)
Write contents: DVD Video
Number of media tried: 4 pcs.
Burn speed: 4X
Burn result: 4x failed

2x failed totally writing lead-in... drive spins for ages with dud disc inserted.
2x seemed to succeed in writing to entire disc, but failed to
be readable even by the 4001IM itself.

From DVDInfo...

Entire Media Code...
00000000 00 6C 00 00 01 40 C1 FD 9E D8 52 00 02 87 0E 15 .l...@....R.....
00000010 98 9A 90 00 03 41 4D 4C 00 00 00 00 04 00 00 00 .....AML........
00000020 00 00 00 00 05 CC C0 00 00 00 01 00 06 0B 10 11 ................

Failed complete burn disc....
Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID AML
Format Capacity Not Formatted
Free Blocks 412352512
Free Capacity 4.38GB(4.71GB)
Book Type DVD-R
Media Type DVD-R
Media Id Code Speed Unknown
Available Write Descriptor CLV 4.0x 5540KBps
Available Write Descriptor CLV 2.0x 2770KBps
Write Strategy Speed 4.0x 5540KBps
2x Speed OPC beta 0B
2x Speed OPC power 10
2x Write Strategy field 1 11 87 78 80
2x Write Strategy field 2 88 80 00 00 00 00
4x Speed OPC beta 06
4x Speed OPC power 17
4x Write Strategy field 1 0D 0F 0B 0B
4x Write Strategy field 2 98 08 0F 0B
4x Write Strategy field 3 00 00 00 00
4x Speed OPC beta multi-pulse 06
4x Speed OPC power multi-pulse 1C
4x Write Strategy field 4 13 A8 88 65
4x Write Strategy field 5 98 9A 88 80 00 00
4x Write Strategy field 6 00 00 D0 00 00
Data area starting sector 30000h
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers 1