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The information is consistent with what I thought it might be: you recorded the photo files on a disc but did not finalize it. Finalizing writes a table of contents on a disc along with the number of files and the end of the recorded part of the disc. Once that is done, no other drive can record on to it; but it now has the information that drives need to read the disc and open the files. You left the disc "open" in order to write more information to it another time in a second recording or second "session." That's what "multi-session" recording is: writing data in one session, then stopping or even removing the disc from the drive, then writing more data to it at later recording sessions. The writing can only be on the original drive that wrote to it in the first place.
Your second drive (I assume that it is a different one from the original) sees the disc as "open" for more recording, but it cannot read the disc (because no table of contents exists on it) or write any date to it. It's stuck. You need to use the original drive again to close or finalize the disc in order to retrieve the files.
Track-at-once recordings are those that write one music track or one file at a time to a disc, even if the recording is done all at one time. This method is used for multi-session recordings. It can create some problems when the sections of digital data on the disc do not have very defined beginnings and endings. Multi-session recordings have to have starts and stops, but there is always a bit of a risk in linking the files together properly. A safer method is to write "disc-at-once" whereby all the data are stored in a buffer and sent as needed to the drive that just keeps on going until the disc is finished. The data sections have clear divisions defined by the software rather than a combination of software and the laser turning off and back on again.
There is another method of retrieving the photo files if, for example, your original drive cannot be used. Recovery software often ignores any address system on a disc and recreates its own based on what the drive can pick up from a medium. That is a last resort, but it may work.
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