Thanks for the reply.
I decided to try the same files on the same DVD - the error message said the burn failed.
I noticed it had some dirt on the surface, cleaned it and the dvd could be read, but the burn failure is a mystery.
The dirt has some bearing but I cannot say if it was on there at the start or afterwards.
The moral must be to keep the dvd very clean.
Thank for your help and sorry to be a nuisance
You are not a nuisance, every question is as important as the next.
My next suggestion was going to be to try writing to a different DVD, to see if it was that particular DVD or something wrong with the software, or the read/write head in the DVD burner drive. It is perfectly possible to have a drive that will read but not burn.
Dear Lotvic and any other expert
MY problems are continuing.
I suspect that my original problem was a 2Gb acrobat file was just too large so using acrobat made the file manageable.
However on burning a dvd received the following message
**Drive reported an error
Sense key=medium error
Sense code 0x73, 0x3**
I am using the same dvds as previously which are RITEK dvd-r x8
This has burned a dvd then failed on a second discand will bot burn on a CD depite bienh only 256Mb
Any help would be appreciated, thanks.
Instead of burning directly from Toast, use Toast to save to a Disk Image; then you may burn that image using Disk Utility.
This will confirm if software or hardware error.
The error reported can be due to disk media low quality
Use Verbatim -R media. Don't even bother with +R of any brand. The drives Apple uses in the MacBooks, MacBook Pros, and iMacs all seem to fail to burn using +R media.
or power calibration issues which mean you need a new drive
or a failed burn laser - as above new drive needed.