Ok. First in entire IT history in this galaxy, I've made hybrid HDD. This little bastard took me a while, few things was tricky, but here it is, shiny half APA, half GPT abomination, right from uncle Frankenstein's lab.
In link below, there are three disk images. One from pure PS2, and one pure PC from which monster was assembled. And of course our little experiment. On PS2 side is installed FHDB, all base partitions in size of 128MiB. On PC side, one big partition with exFAT and step by step guide how to make it. CRC32 in filename because two images are full 40GB drive, so testing archives would be to long to just check integrity.
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https://www.sendspace.com/file/03ip1y
https://mega.nz/file/btw0WKzI#AoqY6OZubPDhhNqOPRFahK0UgeQ9i1Tl8UIc3rcrojA
PS: Changing flags wiping out MBR.XLF (at 0x400000h, ~80KiB). In addition, Windows is damn aggressive, it twice killed my setup without ask... But when I cleared second GPT (at the end of disk) and adds flags, it stops breaking logic structure (TBH very weird). Linux is mostly tolerant here.
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@uyjulian @sp193 @krHACKen