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Only for confirmation of existing dumps — there may be mastering errors which should be preserved. Though even those 50 discs would be a very good start

This method is bad in one thing: it doesn't consider combined read+write offset. Though it's relatively easy to fix these dumps: combined offset can be calculated by dumping 1st session using our guide and then comparing it with dump made from the console. Then all audio tracks in 2nd session should be shifted by the combined offset.

Yes.

If the dump doesn't contain any errors, it has no mastering errors. If it has one or more errors, try dumping the disc again or use another drive. If all images are the same and have errors, that almost certainly means that these errors are due to the mastering.

This dump should be OK. You can also replace bad sector in one image with good sector from another — you should have the same results.

Besides the last sectors it fixes sync and header, though I'll remove this function in the next version. StateS, can you post the logs?

There is no need to buy pirate discs for our DB because we are collecting info only from original licensed discs (even in case dumps from pirate and licensed discs are the same).

If it's audio, you don't need D8. Data is already descrambled.

They were dumped by [unknown] dumpers, I was asked to hide these dumps until redumps are made.

We are not forgetting anything - some discs have mastering EDC/ECC errors which shouldn't be fixed (either accidental or intentionally made by the developers). Not only PSX, but even some Sega CD discs have these errors, so by ripping data tracks in cooked mode or fixing them with CDmage you'll lose data.

You should drop the folder with the compressed image on the unpackIso.exe, not the single files.

AFAIK there is no copy protection on PC Engine CDs (correct me if I am wrong), so dumping discs for this system shouldn't be a problem. There is another issue though - multiple data tracks - but is it a problem for an experienced dumper?

Title, region, languages, size, checksums and serial.

No, CDmage can't find filesystem in 3DO images and won't allow to check them for errors. Anyway, making another dump of the disc and comparing both would be quite enough (and it's even better in case disc has mastering errors or errors intentionally made by the developer which should be preserved and not fixed, like in some PSX discs).