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You did not unpack the game properly.

If they have the same format, then yes. (2352 bytes per sector)
Nero .nrg won't match, since it stores some metadata in the file.

So rawdump/friidump would produce correct "garbage"?

Do the red dots in EAC light up when extracting the last track?

Everything you can buy that is not delivered on a home-burned CD/DVD, but on a real "pressed" media is eligible to be added to the database

Zip files never supported anything bigger than 4GB

I suspect the 2 files you have are indeed corrupt. Did you try to extract them with 7z directly?

Offline data should preferably be in XML, so you can parse it with a tool later to display it

Can you tell me any side that does correct "preservation"? :x

There is an interesting article on english Wikipedia that outlines most things what preservation is about:
http://en.wikipedia.org/wiki/Digital_preservation

Currently the redump.org project does only two of the strategies mentioned there: migration and replication.

Migration from the physical media to one or more binary files and a cue text file that represents the TOC of the disc. This is done using more or less accurate steps (offset detection and that).

Replication for this information gotten by migration by "spreading" it over the world to other people. Since all of the data is copyrighted and the project has no permission to replicate it (yet), this could be called a copyright violation or piracy. (The difference to actual preservation done by the various 'institutes' is that we do the replication publically, which means that everyone could be a preservation mirror.)

What is missing for actual preservation is the attached metadata with more information. This is currently implemented on the redump.org website in a limited way. Ideally this data should be included with the binary copies that were migrated and should be replicated.
Also everything else that were with the physical media should be preserved (Cover, Manual).

One has to note that even the SPS (Software Preservation Society), which is actively archiving the contents of various (floppy) disk formats since 2001, is not able to accurately write back their IPF images to physical media (at least they have not released any piece of software/hardware able to do that yet).

So what should be done to make it "real preservation" for you? For myself, including metadata that has more information how the dump has been obtained would be a good starting point.

Addendum: Just to add, you cannot force people to actually help preserving. Most people do not really care about it, they just think redump.org is a good way to get clean images for playing the games with an emulator. Having a dat file available to everyone just implies that you want to have the images spread for everyone (else the checksum information on the site would be enough for people to verify they have a good image).

It should be noted that every game you can come across should be (re)dumped, maybe it hides a new version that is not covered in the DB yet.

I do not think this is meant to be used for spreading the images. Instead it is meant as to store many games in very little space.

It might be useful if you want to have something like a "complete psx FF7 collection" and share that with others.

But I myself prefer the approach of "1 disc - 1 archive", even when it is space-wasting.

(I currently have all games torrentzipped, since it is the easiest way to quickly scan the whole collection :x)

Haldrie mentioned it is easier to get just one track instead of all, when something is compressed with packiso.
But if you need a single audio track it is easier to get the whole archive than figuring out how to properly turn the ape file into the bin. Decompressing into wav is easy, but removing the RIFF header requires knowledge of the sox.exe commands.

We do extract the image into its parts. For each physical track on the disc we create a physical file. All the data to burn the correct image is stored in the cue file.
You would need to split your image into the parts using the cue (which you can download from redump.org) and some cue tool (google is your friend).
The other way to split your image into parts is using a hexeditor.

If the image contains of audio tracks though, it is most likely they will not match because of offset issues. x