This was brought up on Discord several months ago, but ended up being buried. Luckily I kept a note of this :P
[PSP] Demo Disc for PSP Vol. 2 (Japan)
This dump is incomplete - it's missing the 2nd Video partition that's meant to be appended at the end. The hash/size should most likely be as follows, but it should probably also be redumped. This also means it needs to be changed to UMD-DL.
Size: 951418880
CRC32: 962B28C2
MD5: 45DF080681AA558A7B7AF4A8E0FF0243
SHA1: C96A934581845DC0CA9337947CC448AB6F49350C
This one could possibly also be wrong, but I'm unsure. Video+Audio data seems to be present in the 1st partition. Check the PFI for if the size doesn't match.
[PSP] Demo Disc for PSP Vol. 1 (Japan)
(Even if it isn't, I'm also curious to see in general whether the PFI can be used as a reliable marker to detect multi-partition discs, since there is one extra user data byte used to determine content types, but... probably not)