Do all dvd burners have long open can diodes?

Am I able to know if a dvd burner has a long open can diode before I tear it apart? please check this link and tell me if any of these have long open can diodes.

http://www.factorydirect.ca/catalog/category_list.php?cat=0620

Only 18x and 20x drives may have open can diodes, some may have weird shaped diodes, others may have short open can diodes, and others may have long open can diodes.
Some drives that are known to have long open can diodes are:
Pioneer 112D 18x
Pioneer 115D 20x
Sony Nec Optiarc 7190 20x
And recently the LG GH22NP20 - OEM 22x drives.

For more info please read around the forum.

So you dont know if the LG2086 20x drive has one?

No idea.

No.