One of my observations on optical disc drives:
Earlier TSSTcorp drive models (until ~2007) write the last few sectors (independently from used disc capacity) on CD-R media improperly, which could cause the end of the last written file (with the highest LBA (logical block address)) to be unreadable.
I guess that preventing damage to data is the purpose of the Pad data tracks option on some authoring software, which appends a few blank LBAs at the end after the files.
But has anyone experienced it? And what is the technical reason?