IMac will not play the DVD that I have made on imovie and burned on iMac SuperDrive  ?? (DVD plays fine on household DVD player and also play fine in Toshiba laptop ) Why not on the iMac - anyone know???

iMac will not play the DVD that I have made on imovie and burned on iMac SuperDrive  ?? (DVD plays fine on household DVD player and also plays fine on Toshiba laptop ) Why not on the iMac - anyone know???

There are many reasons this could be the case but whether an optical disc can be read or not is a function of:
The reflective media layer of the disc
Whether the burned disc was a DVD-R, DVD+R, DVD-RW, DVD+RW
The brand, model, and production lot of the disc
The specific frequency of the Write lasers that burned the disc
The specific frequency of the Read lasers that are attempting to read the disc
Are the Read lasers in the drive working (it is common for one set of lasers in a drive to fail while others continue to work)
How old are the Write and Read drives (laser frequencies change with age)
Is there dust on the read laser
Is there dust on the read lens
etc.
At one time it was estimated that fewer than 80% of all burned discs were readable in 90% of the drives. That has, I believe improved over time but at the same time it seems the faillure rate of lasers in the drives has increased but that may simply be the result of how many different read and write lasers there are in today's superdrives. Fortunately todays drives are a lot less expensive the replace -- now that Apple no longer installs optical drives in their computers.

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