I see, but a problem exists. It is that the swap disc can't use TOC.
_disc.txt of gd command
========== TOC ==========
Audio Track 1, LBA 0 - 549150, Length 549151
Total 549151
This is the TOC of audio trap discdic can't recognize how many tracks and sectors exist in actual disc. Of course, if uses sub-channel, dic can recognize these and create TOC artificially.
But if random error of track number exists in sub-channel, especially in the boundary of the track, it's difficult to judge which track number is correct.
That is to say, the result of dumping could be instability.
many non-d8 NEC, Optiarc, etc. drives could be supported.
Btw, can other tools (e.g. CDTools) use the swap disc by these drives and dump the scrambled image?
If takes out the swap disc using a pin and inserts the target disc and pushes back the tray, some drives read the target disc, not the swap disc.