PSP dumping

[gamecaptor]

Hi ajax16384,

I'm running a PSP 1001 with 5.50 Prome-4 CFW. I am unable to get umddaxdumper to run. Is ISOTool (v1.970) not a viable option as an alternative for PSP dumping?

Regards.

[Rocket]

gamecaptor, use PSP Filer v6.6.
http://www.geocities.jp/mediumgauge/

[gamecaptor]

gamecaptor, use PSP Filer v6.6.
http://www.geocities.jp/mediumgauge/

Thank you Rocket. I'll give it a try and report back.

[Rocket]

I have the same PSP model as yours - PSP 1001 with CFW 5.50 GEN-D3 and this utility runs great on it.

[gamecaptor]

Hi Rocket,
Yup, it worked like a champ! However, it's lead me to a bigger issue.

I’m attempting to do my own dumps for PSP with the intention of helping the DATs progress. For those just joining the conversation, my setup is PSP-1001 with 5.50 Prome-4 CFW.

I decided to use Knights in the Nightmare (US) as my tester game (I'll try LocoRoco 2 next since I have it handy as well).

I started with the scene release version, Knights_In_The_Nightmare_USA_PSP-PSPKiNG which shows a CRC of 0355DD7C (which is correct according to the no-intro.org DAT file).

I then made a dump with ISO Tool v1.970 and the CRC states 0046BB36. Next I made a dump with PSP Filer 6.6 and the CRC states 0046BB36 which is the same CRC as ISO Tool.

So my question is which is the correct CRC, the scene release or my dump(s)? Since I do not have "dumper" status I do not have access to the Redump PSP DAT file, so I can't be sure what this group believes to be correct, so I'm going off the no-intro.org DAT until I can understand otherwise.

Regards.

[gamecaptor]

I didn't even think to check the sizes, I was too concerned about the CRC. Going back to my question above, what is the correct CRC/Size for a "proper" dump?

Knights in the Nightmare (USA)

Scene CRC: 0355DD7C
Scene ISO Size: 509114368
Scene ISO Size on disk: 509116416

My Dump CRC: 0046BB36
My Dump ISO Size: 509116416
My Dump ISO Size on disk: 509116416

[gamecaptor]

I just did a dump of LocoRoco 2 with both ISO Tool v1.970 and PSP Filer 6 and I ended up with the same CRC and size as the scene release, so this is leading me to believe that the scene release of Knights in the Nightmare is a bad dump. But again, without the DAT to verify against what Redump is calling correct, I'm not entirely sure.

Scene CRC: FF009F58
Scene ISO Size: 1,805,778,944
Scene ISO Size on disk: 1,805,778,944

My Dump CRC: FF009F58
My Dump ISO Size: 1805778944
My Dump ISO Size on disk: 1805778944

[Ris]

Some PSP scene releases are missing 2048 (or sometimes 6144) bytes from the end of the ISO
The built-in UMD Dumper on M33 firmwares misses the last few sectors resulting in a bad dump.

PSP Filer can correctly dump UMD and doesn't miss the last few sectors.

Usually the missing data is all 00's, so sometimes you can just add 2048 or 6144 bytes
of 00's onto the end of the scene release iso and it will match the redump iso.

The DAT on no-intro is actually using data from the Scene Releases.
Scene releases are not verified to be good dumps, this is what redump is doing.

From your example above of 'Knights in the Nightmare (USA)':
(your Dump) 509116416 minus (Scene) 509114368 = 2,048 bytes (scene release is underdumped 2048 bytes)

If you add 2048 bytes of 00's onto the end of the scene ISO, you will probably get the same CRC as your dump.
(But you can't do this for all games though, as some games do have data in the last few sectors.)
It looks like the scene release of 'Knights in the Nightmare (USA)' was dumped using the built-in M33 dumper (bad dump).
(The built-in dumper is the one where can change USB device to UMD0 in the VSH menu on 5.00M33 etc)

'Knights in the Nightmare (USA)' is not in the redump.org database, so post it in the new dumps section of the forum.
Your 'Loco Roco 2 (USA)' dump matches the one on the redump.org database, so it looks like you are dumping correctly.


edit: reworded post a little...

[asapy]

hello, gamecaptor

I'm the founder of no-intro psp dat which was originated to aim to make the perfect set generated from scene, redump and my private DB. However, one of my friend is working on the dat in these days after my leaving for private life.

I started with the scene release version, Knights_In_The_Nightmare_USA_PSP-PSPKiNG which shows a CRC of 0355DD7C (which is correct according to the no-intro.org DAT file).

I then made a dump with ISO Tool v1.970 and the CRC states 0046BB36. Next I made a dump with PSP Filer 6.6 and the CRC states 0046BB36 which is the same CRC as ISO Tool.

So my question is which is the correct CRC, the scene release or my dump(s)? Since I do not have "dumper" status I do not have access to the Redump PSP DAT file, so I can't be sure what this group believes to be correct, so I'm going off the no-intro.org DAT until I can understand otherwise.

your dump is perfect and the pspking dump is bad. pspking is known to use m33 dumper that make 2kb underdump.
the underdump is often fixable and no-intro dat must have fixed it, if they follow the principle. i don't know what happened to them.

By the way, you can't trust the dumps of ANY group, especially when the group is a long run group.
one of the reason is why the standard software of dumping had been changed: UMDDUMPER-> NewUMDDUMPER/FastLoader/DaxDumper/USBSSS -> pspfiler/kantan ripper/m33/ISO Tool/New umd dumper
Only pspfiler, kantan ripper and ISO Tool can make the perfect dump for all the umd games.
The other reason is why they sometimes make bad dumps and rebuilt isos.

I just did a dump of LocoRoco 2 with both ISO Tool v1.970 and PSP Filer 6 and I ended up with the same CRC and size as the scene release, so this is leading me to believe that the scene release of Knights in the Nightmare is a bad dump. But again, without the DAT to verify against what Redump is calling correct, I'm not entirely sure.

Scene CRC: FF009F58
Scene ISO Size: 1,805,778,944
Scene ISO Size on disk: 1,805,778,944

My Dump CRC: FF009F58
My Dump ISO Size: 1805778944
My Dump ISO Size on disk: 1805778944

yes, all of your dumps and the scene dump is perfect.

[gamecaptor]

Ris and asapy, thank you both for chiming in with these great explanations. Now that I have a better understanding I will work on helping contributed to the PSP DAT.

Again, thank you for your time.

Regards.