Updating of firmware for drive Optiarc DVD Rw AD-5680H

Question

updating of firmware for drive Optiarc DVD Rw AD-5680H
it seems compulsory since burning of DVD Verbatim disks are failed
but successful with Verbatim DVD -RW
Mac Mini ,Mountain Lion etc
the drive of my PowerBook Pro
works well
Mashita DVD -R UJ -868
where can I find and download this updafe
THKS

Answer 1

Failure with one type of optical media and not another -- even from the same manufacturer -- is not unusual. DVDs and DVD-RWs use different dies that respond to different lasers in the optical drive. There are numerous other possibllities here.
It would not be unusual if the write laser for DVDs has burned out but the DVD-RW is still working becasue they use entirely separate lasers of a different intensity and frequency.
It may be the dyes used in a particular lot of Verbatim DVDs are not quite compatible with the DVD lasers in your drive (that is independent of DVD-RWs because they use different lasers.
Because of manufacturing variations your drive may burn other brands of DVD blanks flwlessly, but just won't work with Verbatim DVD blanks.
The DVD Read/Write lasers in your drive may simply be dirty.
Changing/updating the firmware in an optical can be done, but there is a definite risk of converting the optical drive into something useful only as a paper weight.
Try another brand of DVD blank or even a different model Verbatim. (I have seen cases where discs from a different manufacturing lot from the same vendor worked when another failed.)
If you are using DVD-R blanks try a DVD+R (there again different lasers are involved.
It is tricky to clean slot loading optical drives, but sometimes simply blowing them out with short bursts of canned air will work. Be sure the computer has been powered down for a good while and the optical drive is completely cooled. Then use only short bursts of air to prevent super cooled liquid air from getting into the drive. That can easily crack the lenses if you aren't careful.
If your Mac mini is less than a year old or you have Apple Care, get an appointment and take it to the Genius Desk of the nearest Apple store. If you aren't covered under warranty a bus powered external optical drive very probably costs less than the labor charge to diagnose the issue with your drive.