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Hi Roman, troubleshooting all the CHD delta stuff and unavailables after audit recently, I switched from my long standing 'Normal Mode' to 'Hash Collision Name' for the Full Merge Mode to see if that would help on some rebuilds.  What's the difference and is it rare to use that mode vs 'Normal' or should I?

ok...all baddump chds:

acorn/bbc.cpp:Torch CH240[torchh]: torch_utilities
amiga/cubo.cpp:Candy Puzzle (v1.0)[cndypuzl]: cndypuzl
..

Thanks Roman, Windyfairy got back to me about this after I mentioned it in a private message at Bannister's.  It's an issue they and VAS are now aware of.
Here's the pull request: https://github.com/mamedev/mame/pull/12057

Did you play this game?

ok...all baddump chds:

acorn/bbc.cpp:Torch CH240[torchh]: torch_utilities
amiga/cubo.cpp:Candy Puzzle (v1.0)[cndypuzl]: cndypuzl
amiga/cubo.cpp:Eldorado (4.2)[eldoralg]: eldorado
amiga/cubo.cpp:Harem Challenge[haremchl]: haremchl
amiga/cubo.cpp:Laser Quiz 2 Italy (v1.0)[lsrquiz2i]: lsrquiz2
amiga/cubo.cpp:Laser Quiz Greece[lsrquizg]: laserquizgreek2pro
amiga/cubo.cpp:Laser Quiz Italy[lsrquiz]: lsrquiz
amiga/cubo.cpp:Laser Strixx 2[lasstixx]: lasstixx
amiga/cubo.cpp:Magic Number[mgnumber]: magicnumber
amiga/cubo.cpp:Magic Premium (v1.1)[mgprem11]: mgprem11
amiga/cubo.cpp:Odeon Twister (v1.4)[odeontw]: twister32_17_3
amiga/cubo.cpp:Odeon Twister 2 (v202.19)[odeontw2]: odeontw2
capcom/alien.cpp:Rockman EXE Battle Chip Stadium Ver.3.00[rockmanbc]: rockmanbc
funworld/photoply.cpp:Photo Play 1998 (Spain)[photoply98sp]: photoplay98sp
funworld/photoply.cpp:Photo Play 1999 (Netherlands)[photoply99nl]: photoplay99nl
funworld/photoply.cpp:Photo Play 1999 (Spain)[photoply99sp]: photoplay99sp
funworld/photoply.cpp:Photo Play 2000 (Netherlands)[photoply2knl]: photoplay2knl
funworld/photoply.cpp:Photo Play 2000 (Spain)[photoply2ksp]: photoplay2ksp
funworld/photoply.cpp:Photo Play 2001 (Italy)[photoply2k1it]: photoplay2k1it
funworld/photoply.cpp:Photo Play 2001 (Netherlands)[photoply2k1nl]: photoplay2k1nl
funworld/photoply.cpp:Photo Play 2002 (Belgium)[photoply2k2be]: photoplay2k2be
funworld/photoply.cpp:Photo Play Masters 2001 (Netherlands)[photoply2k1mtnl]: photoplay2k1mtnl
funworld/photoplys.cpp:Photo Play 2001 (Spanish)[photoply2k1sp]: photoplay2001es
funworld/photoplysx.cpp:Photo Play Spirit Xtreme (Spanish)[photopsxsp]: photoply_sprt_xt_2004_sp
funworld/photoplysx.cpp:Photo Play Spirit Xtreme (update, Spanish)[photopsxusp]: photoply_sprt_xt_2004_sp_u
jaleco/tetrisp2.cpp:VJ Dash (Ver 1.2)[vjdasha]: vj_ver1
jaleco/tetrisp2.cpp:VJ Dash (ver 1.0)[vjdash]: vj_ver1
jaleco/tetrisp2.cpp:VJ: Visual & Music Slap[vjslap]: vj_ver1
konami/firebeat.cpp:ParaParaDancing[ppd]: 977kaa01
konami/firebeat.cpp:ParaParaParadise[ppp]: 977jaa01
konami/konamigv.cpp:Beat the Champ (GV053 UAA01)[btchamp]: btchamp
konami/konamigv.cpp:Dead Eye (GV054 UAA01)[kdeadeye]: kdeadeye
konami/konamigv.cpp:Jikkyou Powerful Pro Yakyuu '96 (GV017 Japan 1.03)[powyak96]: powyak96
konami/konamigv.cpp:Let's Attack Crazy Cross (GV027 Asia 1.10)[lacrazyc]: gv027-a1
konami/konamigv.cpp:Nagano Winter Olympics '98 (GX720 EAA)[nagano98]: nagano98
konami/konamigv.cpp:Susume! Taisen Puzzle-Dama (GV027 Japan 1.20)[susume]: gv027j1
konami/konamigv.cpp:Tokimeki Memorial Oshiete Your Heart Seal Version Plus (GE756 JAA)[tmoshspa]: 756jaa01
konami/konamigv.cpp:Wedding Rhapsody (GX624 JAA)[weddingr]: weddingr
konami/konamim2.cpp:Heat of Eleven '98 (ver EAA)[heatof11]: heatof11
konami/konamim2.cpp:Tobe! Polystars (ver JAA)[polystar]: 623jaa02
konami/konamim2.cpp:Total Vice (ver EBA)[totlvice]: 639eba01
konami/konamim2.cpp:Total Vice (ver JAD)[totlvicj]: 639jad01
konami/konamim2.cpp:Total Vice (ver UAC)[totlvicu]: 639uac01
konami/konmedalppc.cpp:GI Turf Wild 3[turfwld3]: f51-pce-a02
konami/kpython.cpp:Pop'n Music 9 (ver JAB)[popn9]: c00jab
konami/kpython2.cpp:DANCE 86.4 FUNKY RADIO STATION (E01:J:A:A:2005040400)[dance864]: e01_jaa_2005040400
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA (FDH:A:A:A:2006071300)[ddrsna]: fdh_aaa_2006071300
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA (FDH:J:A:A:2006090600)[ddrsnj]: fdh_jaa_2006090600
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA (FDH:U:A:A:2006072400)[ddrsnu]: fdh_uaa_2006072400
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA 2 (GDJ:A:A:A:2007071100)[ddrsn2aa]: gdj_aaa_2007071100
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA 2 (GDJ:A:A:A:2007100800)[ddrsn2a]: gdj_aaa_2007100800
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA 2 (GDJ:J:A:A:2007071100)[ddrsn2ja]: gdj_jaa_2007071100
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA 2 (GDJ:J:A:A:2007100800)[ddrsn2j]: gdj_jaa_2007100800
konami/kpython2.cpp:Dance Dance Revolution SuperNOVA 2 (GDJ:U:A:A:2007100800)[ddrsn2u]: gdj_uaa_2007100800
konami/kpython2.cpp:Dancing Stage SuperNOVA (FDH:E:A:A:2006032200)[dstagesna]: fdh_eaa_2006032200
konami/kpython2.cpp:Dancing Stage SuperNOVA (FDH:E:A:A:2006072500)[dstagesn]: fdh_eaa_2006072500
konami/kpython2.cpp:DrumMania V (E02:A:A:A:2005050200)[drmnva]: e02_aaa_2005050201
konami/kpython2.cpp:DrumMania V (E02:J:A:A:2005050200)[drmnvj]: e02_jaa_2005050201
konami/kpython2.cpp:DrumMania V2 (F02:A:A:A:2005101600)[drmnv2ab]: f02_aaa_2005101600
konami/kpython2.cpp:DrumMania V2 (F02:A:A:A:2005112800)[drmnv2aa]: f02_aaa_2005112800
konami/kpython2.cpp:DrumMania V2 (F02:A:A:A:2006011201)[drmnv2a]: f02_aaa_2006011201
konami/kpython2.cpp:DrumMania V2 (F02:J:A:A:2005101600)[drmnv2jb]: f02_jaa_2005101600
konami/kpython2.cpp:DrumMania V2 (F02:J:A:A:2005112800)[drmnv2ja]: f02_jaa_2005112800
konami/kpython2.cpp:DrumMania V2 (F02:J:A:A:2006011201)[drmnv2j]: f02_jaa_2006011201
konami/kpython2.cpp:DrumMania V3 (F32:A:A:A:2006072600)[drmnv3aa]: f32_aaa_2006072600
konami/kpython2.cpp:DrumMania V3 (F32:A:A:A:2006101800)[drmnv3a]: f32_aaa_2006101800
konami/kpython2.cpp:DrumMania V3 (F32:J:A:A:2006072600)[drmnv3ja]: f32_jaa_2006072600
konami/kpython2.cpp:DrumMania V3 (F32:J:A:A:2006101800)[drmnv3j]: f32_jaa_2006101800
konami/kpython2.cpp:Guitar Freaks V (E03:A:A:A:2005050200)[gtrfrkva]: e03_aaa_2005050201
konami/kpython2.cpp:Guitar Freaks V (E03:J:A:A:2005050200)[gtrfrkvj]: e03_jaa_2005050201
konami/kpython2.cpp:Guitar Freaks V2 (F03:A:A:A:2005101600)[gtrfrkv2ab]: f03_aaa_2005101600
konami/kpython2.cpp:Guitar Freaks V2 (F03:A:A:A:2005112800)[gtrfrkv2aa]: f03_aaa_2005112800
konami/kpython2.cpp:Guitar Freaks V2 (F03:A:A:A:2006011201)[gtrfrkv2a]: f03_aaa_2006011201
konami/kpython2.cpp:Guitar Freaks V2 (F03:J:A:A:2005101600)[gtrfrkv2jb]: f03_jaa_2005101600
konami/kpython2.cpp:Guitar Freaks V2 (F03:J:A:A:2005112800)[gtrfrkv2ja]: f03_jaa_2005112800
konami/kpython2.cpp:Guitar Freaks V2 (F03:J:A:A:2006011201)[gtrfrkv2j]: f03_jaa_2006011201
konami/kpython2.cpp:Guitar Freaks V3 (F33:A:A:A:2006072600)[gtrfrkv3aa]: f33_aaa_2006072600
konami/kpython2.cpp:Guitar Freaks V3 (F33:A:A:A:2006101800)[gtrfrkv3a]: f33_aaa_2006101800
konami/kpython2.cpp:Guitar Freaks V3 (F33:J:A:A:2006072600)[gtrfrkv3ja]: f33_jaa_2006072600
konami/kpython2.cpp:Guitar Freaks V3 (F33:J:A:A:2006101800)[gtrfrkv3j]: f33_jaa_2006101800
konami/kpython2.cpp:Thrill Drive 3 (D44:J:A:A:20050316)[thrild3j]: d44_jab_20050316
konami/kpython2.cpp:Toy's March (E00:J:A:A:2005011602)[toysmarch]: e00_jaa_2005011602
konami/kpython2.cpp:Toy's March 2 (F00:J:A:A:2005110400)[toysmarch2]: f00_jaa_2005110400
konami/ksys573.cpp:Bass Angler 2 (GE865 VER. JAA)[bassang2]: 865jaa02
konami/ksys573.cpp:CD-ROM Drive Updater (700A04)[cr589fwa]: 700a04
konami/ksys573.cpp:CD-ROM Drive Updater 2.0 (700B04)[cr589fw]: 700b04
konami/ksys573.cpp:Dance Dance Revolution (GC845 VER. JAA)[ddrja]: 845jaa02
konami/ksys573.cpp:Dance Dance Revolution (GN845 VER. UAA)[ddru]: 845uaa02
konami/ksys573.cpp:Dance Dance Revolution 2nd Mix (GN895 VER. JAA)[ddr2m]: 895jaa02
konami/ksys573.cpp:Dance Dance Revolution 2nd Mix with beatmaniaIIDX CLUB VERSiON (GE896 VER. JAA)[ddr2mc]: 896jaa01 895jaa02
konami/ksys573.cpp:Dance Dance Revolution 4th Mix (G*A33 VER. AAA)[ddr4m]: a33aaa02
konami/ksys573.cpp:Dance Dance Revolution 4th Mix (G*A33 VER. JAA)[ddr4mj]: a33jaa02
konami/ksys573.cpp:Dance Dance Revolution 4th Mix Plus Solo (G*A34 VER. JBA)[ddr4mps]: a34jba02
konami/ksys573.cpp:Dance Dance Revolution 4th Mix Solo (G*A33 VER. ABA)[ddr4ms]: a33aba02
konami/ksys573.cpp:Dance Dance Revolution 4th Mix Solo (G*A33 VER. JBA)[ddr4msj]: a33jba02
konami/ksys573.cpp:Dance Dance Revolution Best of Cool Dancers (GE892 VER. JAA)[ddrbocd]: 892jaa01 895jaa02
konami/ksys573.cpp:Dance Dance Revolution Extreme (G*C36 VER. JAA)[ddrextrm]: c36jaa02
konami/ksys573.cpp:Dance Dance Revolution Solo 2000 (GC905 VER. AAA)[ddrs2k]: 905aaa02
konami/ksys573.cpp:Dance Dance Revolution USA (G*A44 VER. UAA)[ddrusa]: a44uaa02
konami/ksys573.cpp:Dance Freaks (G*874 VER. KAA)[dncfrks]: 874kaa
konami/ksys573.cpp:Dance Maniax (G*874 VER. JAA)[dmx]: 874jaa
konami/ksys573.cpp:Dance Maniax 2nd Mix (G*A39 VER. JAA)[dmx2m]: a39jaa02
konami/ksys573.cpp:Dancing Stage (GN845 VER. EAA)[dstagea]: 845uaa02
konami/ksys573.cpp:Dancing Stage - Internet Ranking Ver (GC845 VER. EBA)[dstage]: gc845eba
konami/ksys573.cpp:Dancing Stage Euro Mix (G*936 VER. EAA)[dsem]: 936eaa
konami/ksys573.cpp:Dancing Stage Euro Mix 2 (G*C23 VER. EAA)[dsem2]: c23eaa02
konami/ksys573.cpp:Dancing Stage Featuring Disney's Rave (GCA37JAA)[dsfdr]: a37jaa02
konami/ksys573.cpp:Dancing Stage featuring Dreams Come True (GC910 VER. JAA)[dsfdcta]: 910jaa02
konami/ksys573.cpp:Dancing Stage featuring Dreams Come True (GC910 VER. JCA)[dsfdct]: 910jca02
konami/ksys573.cpp:Dancing Stage featuring TRUE KiSS DESTiNATiON (G*884 VER. JAA)[dsftkd]: 884jaa02
konami/ksys573.cpp:DrumMania (GQ881 VER. JAD ALT CD)[drmna]: 881jad01
konami/ksys573.cpp:DrumMania (GQ881 VER. JAD)[drmn]: 881xxb02
konami/ksys573.cpp:DrumMania (GQ881 VER. UAB)[drmnu]: 881xxb02
konami/ksys573.cpp:DrumMania 10th Mix (G*D40 VER. JAA)[drmn10m]: d40jaa02 d40jba02
konami/ksys573.cpp:DrumMania 2nd Mix (GE912 VER. JAB)[drmn2m]: 912jab02
konami/ksys573.cpp:DrumMania 2nd Mix Session Power Up Kit (GE912 VER. JAB)[drmn2mpu]: 912jab02 912za01
konami/ksys573.cpp:DrumMania 3rd Mix (G*A23 VER. JAA)[drmn3m]: a23jaa02
konami/ksys573.cpp:DrumMania 4th Mix (G*A25 VER. JAA)[drmn4m]: a25jaa02 a25jba02
konami/ksys573.cpp:DrumMania 5th Mix (G*B05 VER. JAA)[drmn5m]: b05jaa02 b05jba02
konami/ksys573.cpp:DrumMania 6th Mix (G*B16 VER. JAA)[drmn6m]: b16jaa02 b16jba02
konami/ksys573.cpp:DrumMania 7th Mix (G*C07 VER. JAA)[drmn7ma]: c07jaa02 c07jba02
konami/ksys573.cpp:DrumMania 7th Mix power-up ver. (G*C07 VER. JBA)[drmn7m]: c07jda02
konami/ksys573.cpp:DrumMania 9th Mix (G*D09 VER. JAA)[drmn9ma]: d09jaa02 d09jba02
konami/ksys573.cpp:DrumMania 9th Mix (G*D09 VER. JAB)[drmn9m]: d09jaa02 d09jba02
konami/ksys573.cpp:Fighting Mania (QG918 VER. AAA)[fghtmna]: 918xxb02
konami/ksys573.cpp:Fighting Mania (QG918 VER. EAA)[fghtmn]: 918xxb02
konami/ksys573.cpp:Fighting Mania (QG918 VER. KAA)[fghtmnk]: 918xxb02
konami/ksys573.cpp:Fighting Mania (QG918 VER. UAA)[fghtmnu]: 918xxb02
konami/ksys573.cpp:Fisherman's Bait - A Bass Challenge (GE765 VER. UAB)[fbaitbc]: 765uab02
konami/ksys573.cpp:Fisherman's Bait - Marlin Challenge (GX889 VER. AA)[fbaitmca]: 889aa
konami/ksys573.cpp:Fisherman's Bait - Marlin Challenge (GX889 VER. EA)[fbaitmc]: 889ea
konami/ksys573.cpp:Fisherman's Bait - Marlin Challenge (GX889 VER. JA)[fbaitmcj]: 889ja
konami/ksys573.cpp:Fisherman's Bait - Marlin Challenge (GX889 VER. UA)[fbaitmcu]: 889ua
konami/ksys573.cpp:Fisherman's Bait 2 - A Bass Challenge (GE865 VER. UAB)[fbait2bc]: 865uab02
konami/ksys573.cpp:Guitar Freaks (GQ886 VER. AAC)[gtrfrksac]: 886__c02
konami/ksys573.cpp:Guitar Freaks (GQ886 VER. EAC)[gtrfrksc]: 886__c02
konami/ksys573.cpp:Guitar Freaks (GQ886 VER. JAC)[gtrfrksjc]: 886__c02
konami/ksys573.cpp:Guitar Freaks (GQ886 VER. UAC)[gtrfrksuc]: 886__c02
konami/ksys573.cpp:Guitar Freaks 10th Mix (G*D10 VER. JAA)[gtfrk10ma]: d10jba02 d10jaa02
konami/ksys573.cpp:Guitar Freaks 10th Mix (G*D10 VER. JAB)[gtfrk10m]: d10jab01 d10jba02 d10jaa02
konami/ksys573.cpp:Guitar Freaks 11th Mix (G*D39 VER. JAA)[gtfrk11m]: d39jaa02
konami/ksys573.cpp:Guitar Freaks 2nd Mix (GQ883 VER. AAA)[gtrfrk2maa]: 883__a01
konami/ksys573.cpp:Guitar Freaks 2nd Mix (GQ883 VER. EAA)[gtrfrk2ma]: 883__a01
konami/ksys573.cpp:Guitar Freaks 2nd Mix (GQ883 VER. JAA)[gtrfrk2mja]: 883__a01
konami/ksys573.cpp:Guitar Freaks 2nd Mix (GQ883 VER. KAA)[gtrfrk2mka]: 883__a01
konami/ksys573.cpp:Guitar Freaks 2nd Mix (GQ883 VER. UAA)[gtrfrk2mua]: 883__a01
konami/ksys573.cpp:Guitar Freaks 2nd Mix Link Kit 1 (GE929 VER. JAA)[gtrfrk2ml1]: 929jaa02
konami/ksys573.cpp:Guitar Freaks 2nd Mix Link Kit 2 (GC929 VER. JBB)[gtrfrk2ml2]: 929jbb02
konami/ksys573.cpp:Guitar Freaks 2nd Mix Ver 1.01 (GQ883 VER. JAD)[gtrfrk2m]: 929jbb02
konami/ksys573.cpp:Guitar Freaks 3rd Mix (GE949 VER. JAB)[gtfrk3ma]: 949jab02
konami/ksys573.cpp:Guitar Freaks 3rd Mix (GE949 VER. JAC)[gtrfrk3m]: 949jac01 949jab02
konami/ksys573.cpp:Guitar Freaks 3rd Mix - security cassette versionup (949JAZ02)[gtfrk3mb]: 949jaz02
konami/ksys573.cpp:Guitar Freaks 4th Mix (G*A24 VER. JAA)[gtrfrk4m]: a24jaa02
konami/ksys573.cpp:Guitar Freaks 5th Mix (G*A26 VER. JAA)[gtrfrk5m]: a26jaa02
konami/ksys573.cpp:Guitar Freaks 6th Mix (G*B06 VER. JAA)[gtrfrk6m]: b06jaa02
konami/ksys573.cpp:Guitar Freaks 8th Mix (G*C08 VER. JAA)[gtrfrk8ma]: c08jaa02
konami/ksys573.cpp:Guitar Freaks 8th Mix power-up ver. (G*C08 VER. JBA)[gtrfrk8m]: c08jba02
konami/ksys573.cpp:Guitar Freaks Ver 1.01 (GQ886 VER. AAD)[gtrfrksa]: 886__d02
konami/ksys573.cpp:Guitar Freaks Ver 1.01 (GQ886 VER. EAD)[gtrfrks]: 886__d02
konami/ksys573.cpp:Guitar Freaks Ver 1.01 (GQ886 VER. JAD)[gtrfrksj]: 886__d02
konami/ksys573.cpp:Guitar Freaks Ver 1.01 (GQ886 VER. UAD)[gtrfrksu]: 886__d02
konami/ksys573.cpp:Hyper Bishi Bashi Champ - 2 Player (GX908 1999/08/24 VER. JAA)[hypbbc2p]: 908a02
konami/ksys573.cpp:Hyper Bishi Bashi Champ - 2 Player (GX908 1999/08/24 VER. KAA)[hypbbc2pk]: 908a02
konami/ksys573.cpp:Jikkyou Powerful Pro Yakyuu EX '98 (GC811 VER. JAA)[jppyex98]: 811jaa02
konami/ksys573.cpp:Konami 80's AC Special (GC826 VER. AAA)[konam80a]: 826aaa01
konami/ksys573.cpp:Konami 80's AC Special (GC826 VER. EAA)[konam80s]: 826eaa01
konami/ksys573.cpp:Konami 80's AC Special (GC826 VER. KAA)[konam80k]: 826kaa01
konami/ksys573.cpp:Percussion Freaks (GQ881 VER. AAB)[pcnfrka]: 881xxb02
konami/ksys573.cpp:Percussion Freaks (GQ881 VER. EAB)[pcnfrk]: 881xxb02
konami/ksys573.cpp:Percussion Freaks (GQ881 VER. KAB)[pcnfrkk]: 881xxb02
konami/ksys573.cpp:Percussion Freaks 10th Mix (G*D40 VER. AAA)[pcnfrk10m]: d40aca02
konami/ksys573.cpp:Percussion Freaks 2nd Mix (GE912 VER. AAA)[pcnfrk2m]: 912aaa02
konami/ksys573.cpp:Percussion Freaks 2nd Mix (GE912 VER. KAA)[pcnfrk2mk]: 912kaa02
konami/ksys573.cpp:Percussion Freaks 3rd Mix (G*A23 VER. AAA)[pcnfrk3m]: a23aaa02
konami/ksys573.cpp:Percussion Freaks 3rd Mix (G*A23 VER. KAA)[pcnfrk3mk]: a23kaa02
konami/ksys573.cpp:Percussion Freaks 4th Mix (G*A25 VER. AAA)[pcnfrk4m]: a25aaa02 a25aba02
konami/ksys573.cpp:Percussion Freaks 4th Mix (G*A25 VER. KAA)[pcnfrk4mk]: a25kaa02
konami/ksys573.cpp:Percussion Freaks 6th Mix (G*B16 VER. AAA)[pcnfrk6m]: b16aaa02
konami/ksys573.cpp:Percussion Freaks 7th Mix (G*C07 VER. AAA)[pcnfrk7m]: c07aaa02
konami/ksys573.cpp:Percussion Freaks 9th Mix (G*D09 VER. AAA)[pcnfrk9m]: d09aba02
konami/ksys573.cpp:Punch Mania 2: Hokuto no Ken (GQA09 JAA)[pnchmn2]: a09jaa02
konami/ksys573.cpp:Punch Mania: Hokuto no Ken (GQ918 VER. JAB)[pnchmn]: 918xxb02
konami/viper.cpp:World Combat (ver KBC:B)[wcombatk]: c22c02
midway/midqslvr.cpp:Hydro Thunder[hydrthnd]: hydro
midway/midqslvr.cpp:Offroad Thunder[offrthnd]: offrthnd
midway/seattle.cpp:CarnEvil (v1.0.1)[carnevil1]: carnevi1
midway/seattle.cpp:Mace: The Dark Age (HDD 1.0a)[macea]: macea
misc/comebaby.cpp:Come On Baby[comebaby]: comebaby
misc/gammagic.cpp:99 Bottles of Beer[99bottles]: 99bottles
misc/gammagic.cpp:Game Magic[gammagic]: gammagic
misc/radikaldarts.cpp:Radikal Darts (Diana Version 7.29.25)[radikaldrt]: hts541040g9at00_dv7.29.25
misc/silverball.cpp:Silverball (6.32)[slvrball632]: silverball_6.32
misc/silverball.cpp:Silverball (7.20)[slvrball720]: silverball_7.20
misc/silverball.cpp:Silverball (8.01)[slvrball806]: silverball_8.06
misc/silverball.cpp:Silverball Bulova (4.09, set 1)[slvrballbu409]: silverball_bulova_4.09_1
misc/silverball.cpp:Silverball Bulova (4.09, set 2)[slvrballbu409b]: silverball_bulova_4.09_2
misc/xtom3d.cpp:Pump It Up: The 1st Dance Floor (ver 0.53.1999.9.31)[pumpit1]: 19990930
namco/namcos10.cpp:Taiko no Tatsujin RT: Nippon no Kokoro (Japan, TKN1 Ver.A)[taikort]: tk-n
namco/rbowlorama.cpp:Rockin' Bowl-O-Rama (v2.1.1)[rbowlorama]: namco_bowling
namco/turrett.cpp:Turret Tower[turrett]: turrett
pc/calchase.cpp:California Chase[calchase]: calchase
pc/quakeat.cpp:Quake Arcade Tournament (Release Beta 2)[quake]: quakeat
philips/cdi.cpp:Quizard (v1.2, German, i8751 DE 11 D3)[quizard_12]: quizard12
philips/cdi.cpp:Quizard (v1.2, Italian, i8751 IT 11 I2)[quizardi_12]: quizard12
philips/cdi.cpp:Quizard (v1.7, German, i8751 DE 11 D3)[quizard_17]: quizard17
philips/cdi.cpp:Quizard (v1.7, Italian, i8751 IT 11 I2)[quizardi_17]: quizard17
philips/cdi.cpp:Quizard (v1.8, German, i8751 DE 11 D3)[quizard]: quizard18
philips/cdi.cpp:Quizard (v1.8, Italian, i8751 IT 11 I2)[quizardi]: quizard18
philips/cdi.cpp:Quizard 2 (v2.2, German, i8751 DN 122 D3)[quizard2_22]: quizard22
philips/cdi.cpp:Quizard 2 (v2.3, German, i8751 DN 122 D3)[quizard2]: quizard23
philips/cdi.cpp:Quizard 3 (v3.2, German, i8751 DE 132 D3)[quizard3_32]: quizard32
philips/cdi.cpp:Quizard 3 (v3.4, German, i8751 DE 132 A1)[quizard3a]: quizard34
philips/cdi.cpp:Quizard 3 (v3.4, German, i8751 DE 132 D3)[quizard3]: quizard34
philips/cdi.cpp:Quizard 4 Rainbow (v4.0, German, i8751 DE 142 D3)[quizard4_40]: quizard4r40
philips/cdi.cpp:Quizard 4 Rainbow (v4.1, German, i8751 DE 142 D3)[quizard4_41]: quizard4r41
philips/cdi.cpp:Quizard 4 Rainbow (v4.2, Czech, i8751 TS142 CZ1)[quizard4cz]: quizard4r42
philips/cdi.cpp:Quizard 4 Rainbow (v4.2, German, i8751 DE 142 D3)[quizard4]: quizard4r42
pinball/newcanasta.cpp:New Canasta[newcanasta]: newcanasta
sega/segasp.cpp:Kodai Ouja Kyouryuu King - Mezame yo! Arata-naru Chikara!! (Japan, Ver 4.000) (MDA-C0061)[dinoki4]: mda-c0061
sega/triforce.cpp:Mario Kart Arcade GP (Japan, MKA1 Ver.C, update)[mkartagpc]: update_software_mka1_ver_c
unico/unianapc.cpp:Dream Hunting (US)[dhunting]: dream hunting
unico/unianapc.cpp:Hog Wild (US)[hogwild]: hog wild

I mean just a current non delta regular clone CHD that's marked bad dump.  With your wise XML ways do you see one or a few?

I haven't spent any time on convertig chds to deltas...so..nope..

Thanks, do you know of another 'bad' flagged clone CHD I can check to see if it's the bad flag or if it seems specific to these huge python2.cpp games (DVDs I think).

well....haven't looked into detail yet but in general cmpro only reads the chd header and compares the hashes....a decompression error can only be found if Scanner-Hash&CHD-CHD MD5/SHA1+Decompress CHD & check SHA1/MD5 is checked.
So that is most likely the reason why cmpro doesn't come up with a warning by default...the header of the bad file seems to be valid.

Seems to me another chdman issue regarding delta chds.....one where the creation doesn't exit with an error message but the produced data is bad.

Been looking at this for a couple of days brought on by an audit in the MAME UI (F1) and the available filter.  Shows 14 damaged delta CHDs that can't be -verify or -info'ed with chdman. Before I posted at mametesters I was hoping for a confirmation here, note that clrmame doesn't flag these w/ default settings.  Possible commonality? CHDs marked as 'Bad Dump'.

Current tip of tree chdman.exe (or release .262) is producing some delta chds that will error on run with 'CHD ERROR: Decompression error'. Resulting in machine placement into unavailable filter folder in MAME UI.

One such example is the child/clone photoply_sprt_xt_2004_sp_u.chd in Photo Play Spirit Xtreme (Spanish) / photopsxsp

Steps to repro:
1. Use full merged storage method.
2. Place the two Photo Play Spirit Xtreme (Spanish) CHDs into their appropriate directory:
"C:\MAME\Roms\photopsxsp\photoply_sprt_xt_2004_sp_u.chd"
"C:\MAME\Roms\photopsxsp\photoply_sprt_xt_2004_sp.chd"

7,283,106,173 photoply_sprt_xt_2004_sp.chd
3,427,733,716 photoply_sprt_xt_2004_sp_u.chd

3. Launch MAME.exe and do an audit with F1 from the UI.
4. Confirm Photo Play Spirit Xtreme (Spanish) is not present in the Unavailable filter/folder.
5. Convert the child CHD to a delta w/ clrmamepro or manually.
6. New child CHD gets cut down to size to:

1,977,511,281 photoply_sprt_xt_2004_sp_u.chd

7. Attempt to verify this chd:
\MAME\ROMs\photopsxsp>chdman verify -i photoply_sprt_xt_2004_sp_u.chd -ip photoply_sprt_xt_2004_sp.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262-152-g0636e54bb60)
Error opening CHD file (photoply_sprt_xt_2004_sp_u.chd): Decompression error
Fatal error occurred: 1

8. Run audit in MAME's UI with F1.
9. Observe Photo Play is now in the unavailable filter/folder due to the error.
10. A normal run with clrmamepro does not find this.


---
c:\O\Games\MAME\ROMs\photopsxsp>chdman info -v -i photoply_sprt_xt_2004_sp_u.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262-152-g0636e54bb60)
Error opening CHD file (photoply_sprt_xt_2004_sp_u.chd): Decompression error
Fatal error occurred: 1

Before delta creation, child CHD is ok:
c:\Users\jhard\Desktop\ROMs\MAME 0.262 CHDs (merged)\photopsxsp>chdman info -i photoply_sprt_xt_2004_sp_u.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262)
Input file:   photoply_sprt_xt_2004_sp_u.chd
File Version: 5
Logical size: 160,041,885,696 bytes
Hunk Size:    4,096 bytes
Total Hunks:  39,072,726
Unit Size:    512 bytes
Total Units:  312,581,808
Compression:  lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
CHD size:     3,427,733,716 bytes
Ratio:        2.1%
SHA1:         dac230cae6efaa24362260101d39b421d5fccd45
Data SHA1:    5c60dcfee2c635e4c20fa733aad37c60c003b600
Metadata:     Tag='GDDD'  Index=0  Length=37 bytes
              CYLS:310101,HEADS:16,SECS:63,BPS:512.

c:\Users\jhard\Desktop\ROMs\MAME 0.262 CHDs (merged)\photopsxsp>chdman verify -i photoply_sprt_xt_2004_sp_u.ch
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262)
Raw SHA1 verification successful!
Overall SHA1 verification successful!

Actual delta CHD creation goes through 100%:
c:\O\Games\MAME\ROMs\photopsxsp>chdman copy -i photoply_sprt_xt_2004_sp_u.chd -op photoply_sprt_xt_2004_sp.chd -o newchild.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262)
Output CHD:   newchild.chd
Parent CHD:   photoply_sprt_xt_2004_sp.chd
Input CHD:    photoply_sprt_xt_2004_sp_u.chd
Compression:  lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
Hunk size:    4,096
Logical size: 160,041,885,696
Compression complete ... final ratio = 1.2%

02/22/2024  12:18 PM     1,977,511,281 newchild.chd

Info and verify of new delta CHD fails and goes to unavailable upon audit.
c:\O\Games\MAME\ROMs\photopsxsp>chdman info -i newchild.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.262 (mame0262)
Error opening CHD file (newchild.chd): Decompression error
Fatal error occurred: 1

You need to use https://mamedev.emulab.it/clrmamepro/binaries/cmpro_deltaverify.7z
which is rock stable
Real life job currently takes all my time.....