Need Help about Dreamshell without GD ROM

[pstationBG]

Здраствуйте ребята !!!
Hello guys !
At the begining > CONGRATULATIONS SWAT TEAM about this amazing OS for Dreamcast .
Amazing hard work from SWAT and other guys !
Ok so here starts my questions .
I have 2 consoles with not working GD ROMs, so I saw Dreamshell as an option for me .
I want to use Dreamshell without GD ROM at all ( will be removed from the console)
I have now dual BIOS mod inside testing console and maded SD card adapter .
And here started my pain :P
Tests was with > posting my notes :
- ds_core.bios* - Just Core (DS_CORE.BIN) - working
> broken sound in games <
>>>>> OK WITHOUT GD ROM <<<<<<<<<
---------------------------
ds_core_rd.bios* - working
> very slow speed on reading AND STUPID SOUND
>>>>>>>> OK WITHOUT GD ROM <<<<<<<<<<<<
---------------------------
Tested with 4 different SD cards (Chinese Kingston SDHC 16 GB ,Toshiba 2GB - worked only once...after that BIOS can't see it ,Corsair Mini SD 2 GB with SD adapter and SanDisk 8 GB SDHC )
Actually I tested maybe all BIOSes , only those 2 are working for my needs(without GD ROM ) .
Tested and new "DreamShell bootloader bios " posted by "megavolt85 "
http://www.dc-swat.ru/forum/thread-2246.html
Only this one works kinda well with SD card , but it is not working when I remove GD ROM ...
For now just tested Dreamshell with SD card , just to see how it works .
My general idea is to add only Hard Drive and remove GD ROM , so please tell me:
1. What Bios to use for MX chip ( will remove original BIOS at all )
2. What to place inside Hard Drive ( only DS folder or ...)

So thanks in advance for your help and CHEERS from Bulgaria ;)