Time to bump this topic for a new discussion!
I noticed about a week ago that we have a few bad dumps in the database. I found these thanks to TheHustle. He had asked me how to dump one of them, but I found out they were not standard UMDs and they could not be dumped the usual way.
These are demo discs with a game + video partition and the entire video section is corrupt in the dump I tested "UCJB-98302". I do not know which dumping tools were used to make these dumps, but I'm sure the video partition must be corrupted in all three dumps.
I bought one of the demo discs to try dumping this type of UMD myself, the demo disc I have is "UCJB-98306". My dump does not match the database, which is not surprising. I found a way to dump both partitions correctly, but they have to be dumped to separate .iso files.
Here are the instructions:
Note: UMD_DATA.BIN of each ISO has the partition number, 0001 & 0002.
1) Use UMDKiller V1.2 to dump the first partition. It will be saved to ms0:/ISO/UCJB-98306.iso.
2) Connect your PSP to a PC and rename the dumped ISO as "UCJB-98306_0001.iso" and then move it onto the PC.
3) Use UMDKillerPRX V1.5 to dump the second partition. It will be saved to ms0:/ISO/UCJB-98306.iso.
4) Connect your PSP to a PC and rename the dumped ISO as "UCJB-98306_0002.iso" and then move it onto the PC.
5) Open Notepad and type the text below, make sure to modify the filenames to match your ISOs.
copy /b UCJB-98306_0001.iso + UCJB-98306_0002.iso UCJB-98306_merged.iso
6) Save the file as Merge.bat and move it to the same location as the two ISO dumps.
7) Double-click the Merge.bat to merge the ISOs into one file, "UCJB-98306_merged.iso" is created.
8) Use clrmamepro's Dir2Dat function and uncheck everything except Add MD5+SHA1, create the .dat file to save the three ISO hashes.
There is currently no dumping tool that will dump both partitions at once, and I don't know if this is able to be done either. The dumps in the database were joined together to make the dump one file. I think merging the two ISOs is okay. There are very few game UMDs with two partitions, and we can include the non-merged hashes in the comments. The only issue with merging is that the video partition is unplayable after merging, but that may change in newer PSP CFW.
As a test, I also tried to dump Video UMDs using UMDKillerPRX V1.5, but only the 0002 partition will dump. PSP Filer 6.6 and UMDKiller V1.2 cannot be used on Video UMDs, so these UMDs will have to remain unsupported for now.
So how should we proceed? I think it would be safe to add the fixed dumps with the non-merged hashes in the comments.