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That's easy. Your dumps match dumpcast perfectly, which means that only your tracks 1 & 3 can possibly match redump (since they're identical on redump and dumpcast). Dumpcast uses a different gap layout and offset handling.

Therefore, all your tracks are missing the factory offset correction. Additionally, track02 is missing the 352800 bytes (2 seconds) pregap. Furthermore, your track05 pregap is 1 second smaller than it should be.

I don't want to imply anything, but it's completely impossible that all your other dumps matched redump, unless you used different settings for Sonic Adventure and Floigan. The fact that they match dumpcast proves that your gap handling is completely different than redump's

If I want to preserve a game disc, I go to redump. Or toseciso. If I want to preserve a (floppy) disk, I go to SPS. For cartridges, I have to use no-intro. Truong's DB for Audio-CDs. DVDs? No idea.

I've always dreamt of an all-in-one media preservation project. Redump would be the ideal basis with its transparent verification system. Out of all the preservation projects out there, I think it has the most potential. Why not make it the ultimate place to go for preservationists of all kinds?

Sorry, I didn't know that. I don't have any multisession discs anyway.

Yeah, it's only visible to logged in users with dumper status (or higher). Just dump a bunch of discs and you'll gain access in no time Of course you can skip that if you're only interested in the datfile

A big YES from me!

Yeah, happy holidays to everyone And a big thank you to all contributors - dumpers, admins, fellow mods, and especially those who have been working tirelessly on fixing stuff lately (languages, regions and other metadata). Your work is much appreciated!

If I were you I'd stay away as far as possible from these discs... I tried to dump one of them a few months ago, nearly drove me insane.

You can't use IsoBuster here. Use ddump or CloneCD with these profiles. We need the defective sectors to be all 0x55, not 0x00. You MUST dump the disc at least twice with different drives. Some drives don't catch some of the error sectors, I don't know.

I could never get a consistent read on that disc I tried, so after countless retries I gave up. Maybe you have better luck. But be warned, it can take over a week for a single pass to finish depending on your drive...

What about the CDTV? I've seen some really strange EXE dates for that system... Is it even worth to preserve the EXE date in this case? Surely neither the disc nor the program was created in 1978

I'm 90% sure it doesn't have any copy protection. You can't play the game without a subscription anyway, so why would they waste money on protecting the disc? But you should always check with BurnOut or PiD to be 100% sure.

In any case you can dump it like any other DVD with IsoBuster, no additional steps required.

Mmh, -UKV does not necessarily mean it's UK-only. There are some examples of a UKV dump matching an EUR dump.

I haven't figured it out completely yet, but the last letter before the -UKV or -EUR seems much more important. There seems to be a pattern: P is for Europe, D for Germany, E for USA, J for Japan, F for France, U for Australia and so on. Haven't figured out X and Y yet... Anyway, it would be wrong to assume that UKV means UK-only.

Well afaik that's only true for discs with a large positive combined offset (larger than 1 sector = 588 samples). But again, I've never tried to dump discs with a negative combined offset

There is an offset for data tracks, too. Drives recognize and correct it automatically. For an audio disc it doesn't really matter if your music is shifted by 1 or 2 hundredth of a second, at least from a pure listening point of view ^^ But non-audio data usually needs to be bit-accurate, so the drive has to adjust to both the factory and the drive's write offset.

And no, there's no overlap for discs with a negative offset. If the disc has a factory write offset of -647, for example, all data and audio tracks are shifted by those -647 sectors. But, as I mentioned before, the data tracks get adjusted properly, while the audio tracks don't, that's why we have to do that manually ^^

That said, it's possible that EAC loses samples at the beginning of the 1st audio track if the combined offset is negative. It's an annoying EAC quirk. You'll have to make sure that your drive's offset "outweighs" the negative factory offset. I have an LG with +667 which I use to dump -647 (a common PSX factory offset) or similar. If you're lucky, you have a Plextor. In this case you can use PlexTools, which doesn't seem to be affected by that problem

As for IsoBuster, it does know where the data track ends, but it appends the pregap of the 2nd track to it. The reason we need to cut that off is because redump handles the gaps differently. IsoBuster appends a track's gap to the end of the previous track (so the Track 2 pregap is put at the end of Track 1), while redump prepends the gap to the track it actually belongs to (pregap, as per cue specification ^^).

Appending the gap to the previous track is kind of a hackish solution to allow people to listen to their audio tracks without having the (mostly silent) pregap at the beginning.

I hope that answers all your questions