To clarify, the -sao argument enables "Session At Once" recording.. vs the default of "Trace at once" which is not supported by your drive, (At least, not with DVD+RW media..)
-v enables extra verbosity(prints more text..) by the program which helps identify the cause of the issue.. which in your case is easy, your drive doesn't support TAO mode.
-packet apparently enables an experimental form of writing, I don't know more about this unfortunately, but it's a mode supported by your drive.
The order of arguments is rather defined, typically then can be in any way you like.. but typically the must go before the filename argument.
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