Only LUK, understood this. I think.
DVD-R media
When burning data is 100MB, recorder burns disc to 100MB? -> NO.
The true story is here. Recorder burns disc until ~1GB position. So, rest amount (1GB - 100MB = ~900MB) is written by garbage / dummy data. If burning data is Just 6MB? Then, 1024MB - 6MB = ~1018MB garbage data will be written.
Thus,
[100MB Data Recording time] is same with [1GB Data Recording time]
This is not by user behavior. It's done by recorder. And can't disable generally. But Nero has disable option.
As LUK mentioned, this dummy padding operation is NOT by application. It's Burner h/w and DVD format specification related. And he said, control command is exist. This explain why nero can disable padding.
Anyway, my wish is,,
ImgBurn option. Ignore Filesystem Padding (until 1GB).
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NOTE:
I'm using Pioneer A11, BENQ 1640, LITE-ON 1693S / 165P6S.
On DVD-R media, All my recorders DO filesystem padding.
On DVD+R media, All my recorders DO NOT filesystem padding.
In Nero with disable high compatibility mode(= disable filesystem padding), It really DO NOT padding on DVD-R.