Offset detection using the D8 read command

[Jackal]

Today, with the help of Truong Hi, the coder of PerfectRip, we've come up with a better way of detecting the combined read+write offset of a disc. This new method expands upon our previous discovery, and also proves that our current methods of correcting both offsets are correct.

The principle is that, by using the D8 vendor read command on compatible drives, data sectors are read in audio mode and thus become scrambled. The sync remains unscrambled, and its position can be used to determine the combined read+write offset.

Advantages over old method:

- Works on all discs with data tracks
- All data track sectors can be used to detect

Disadvantage:

- It requires a drive that supports the D8 read command. Most Plextor drives (original ones, not rebadged) are confirmed to support this command (755A, 760A, etc).

Software needed:

Px_D8 v1.01A by Truong Hi and Dremora - http://soft.dremora.com/px_d8_1.01A.7z

Usage: px_d8 <drive letter> <LBA sector>

For LBA sector you can just put '0' or any number. If your drive supports the command, it will give you the Combined offset (the offset that is used in EAC for dumping audio tracks).

Precautions:
- If you have a Plextor drive, be sure to update to the latest firmware available for your drive!

[rcw003]

Does anyone know if the newest Plextor drives still support  d8h?  Looking at purchasing a drive to replace one that is dying and was looking at the PX-L890SA.  http://www.newegg.com/Product/Product.a … 6827249066

Thanks

[Jackal]

Does anyone know if the newest Plextor drives still support  d8h?  Looking at purchasing a drive to replace one that is dying and was looking at the PX-L890SA.  http://www.newegg.com/Product/Product.a … 6827249066

Thanks

They don't.. PX-760A is the last one that supports it

[pablogm123]

You need a true Plextor drive (Sanyo chipset). For example any PX-7xx, except 740, 750 and 751. Today, Plextor drives are actually others (Lite-On, LG, Pioneer, NEC...) rebranded by Plextor and they doesn´t offer any special feature.

[MrX_Cuci]

Plextor PX-230A does not work with this util unfortunately.

Working Plextor drives (tested by me): PX-712A, PX-116A

[pablogm123]

PX-230A drive is based on ALi chipset, and it is a BenQ drive rebadged. It isn't a authentic Plextor drive, and doesn't understand D8 command, packed mode for CD+G and so on. However, it exposes, aparently, very excellent capabilities in error correction with worn discs, better than real Plextor drives. This is the favourite drive of Spoon, the dBpoweramp's developer.

[Rocket]

http://soft.dremora.com/px_d8_1.01A.7z

Link is dead. Please, reupload.

[usurper]

Check the Tools of the trade thread, its linked there.

[pablogm123]

http://www.mediafire.com/?mjwmrofiqzf

[Rocket]

Want to buy Plextor drive. What the best choice? What model?

PX-716A http://www.avito.ru/moskva/tovary_dlya_ … _246517703

PX-750A http://www.avito.ru/moskva/tovary_dlya_ … _250304197

PX-755A http://www.avito.ru/sankt-peterburg/tov … _223751673