Recently got the LG GWA-4165B writer. This drive is currently being used to scan the failing DVD. The GWA-4165B drive has been running for about 4 hours now.
The number of missing sectors reported by IsoPuzzle was around 700,000 after brief scans using the Optiarc AD-7200A and Toshiba SD-H802A drives previously. So far the number of missing sectors has been reduced to around 331,000 by using the GWA-4165B drive.
Failing DVD reading progress is relatively slow. It was hoped the GWA-4165B drive would read the DVD data faster, but it appears not to be the case.
So the list of drives used to read the failing DVD has now been updated and revised to include the GWA-4165B drive.
Approximate order of drives with best reading drive at the top, and worst drive at the bottom of this list.
Samsung SH-224GB, firmware SB00, chipset Mediatek MT1862AN
LiteOn iHAS324 C, firmware LL14, chipset Mediatek MT1809LN
LiteOn iHAS124 F, firmware CL99, chipset Mediatek MT1862N <- Selling
LiteOn iHAS324 B, firmware AL14, chipset Mediatek MT1839LN
LG GGW-H20L, firmware YL05, chipset Renesas R8J32702SFPV <- Selling
LG GWA-4165B, firmware DG01, chipset Renesas R8J32007FPV
Asus DVD-E818A9T b, firmware 3.00, chipset Mediatek ???
Plextor PX-891SAF, firmware ???, chipset Mediatek MT1862N <- Sold
Toshiba SD-H802A, firmware HP10, chipset Toshiba TC94A68FG <- Selling
Optiarc AD-7200A, firmware 1.09, chipset NEC MC-10043
Pioneer DVR-215, firmware 1.22, chipset NEC MC-10042
LG GH24NSD1, firmware LG00, chipset Mediatek MT1862AN <- unreliable in copying failing data properly! <- Selling
Still looking at getting 2 or 3 other drives when funds allow.