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EAC gives a gap of 1.74 for track 2

When looking in sector view in ISO Buster, the 150th sector back from track 02 has nothing but ff ff ff on the top, going ahead to 149th before track 02 gives a device read error.

Doing the d8 command the read offset is 252, does having a high offset effect the gap at all?

Is it safe to say that track 02 should always have a 2 second pre-gap?

All other tracks have a 2 second gap.

Also in the guide it says to fill with user data if there is read errors at the 99% point does that go for sega-cd games also?

PR a27 with not correct output settings but read offset correct, gives track 02 a 1.74 gap, so how many bytes would I take off track 01 with resize then? Do I take off 306936 bytes?

You should take off 350448 bytes, check the size to see if it matches.

I could dump Shining Force only with Plextor+PerfectRip. Every other combination gave me wrong results.

Ok, I dumped the data track with ISO Buster and removed 350448 bytes, the size is 68,666,640 is that what you got gigadeath? CRC is a85fa1a0

I got a different size   https://redump.info/disc/1938/

Is your disc Japanese?

No, mine is the North America release.

If you dump with IsoBuster you have to take out the data track the full 352800 bytes, IsoBuster always sees 2seconds after the data track, so your data track size would match mine, the CRC are different of course because they're different region.

What about audio tracks? You should add 2352 bytes of silence at the beginning of track02.


In other words, IsoBuster puts 352800 bytes more at the end of the data track, but PerfectRip/EAC put only 350448 bytes of silence at the start of the first audio track.

Ok, to make sure I got this right, redump the data track and take off 352800 bytes.

dump track 2 without pregap and add a 2 second gap to it?

EAC and Perfectrip both gave me 1.74 gap for track 2 and 2 second gap for every other track.

I just got done dumping the audio once with EAC as I don't know the settings for perfectrip, I just used the default to get the pregap for track02 would that change the gap at all because they aren't the correct output settings?

EDIT: Ok, redump data took out whole 2 second gap and matches your size

If EAC reports that Track02 has 1.74 pregap, just dump them all normal (with "append to next track" option) and then add 2352 bytes of silence (00 bytes) only at very beginning of Track02 with an hex editor. Track02 should already be starting with 00s, you only have to add another 2352 bytes of 00s.

A consideration, after Pepsidrinker dumps is tracks, if they match my Japanese disc but only with gaps shifted 1.74->2.00, it would be pretty clear that all these 1.74 gaps are only misjudgments from dumping programs caused by un-standard mastering.

It's not a case that Japanese discs with "normal" write offset (with normal I mean <100) report 2.00 gaps too, just like USA discs. See F1 Circus CD, Game no Kandume, Vay. When the offset becomes huge, then the dumping programs go mad and 1.74 gaps start appearing. Even official system documentation says minimum gap size for MegaCD is 2 seconds!

Maybe not tomorrow, but in the near future we should change all of them to 2 seconds, hopefully there will be an automatized way to do the process.