hej Good News !
I´m writting this Post from Snow Leopard on my internal HDD !
I mixed your tipps:

- Installed the newest Chameleon - replaced "boot" again
- Insert the new IOATAFamily.kext

When this is done, it boots very stable and fast without any command at the beginning !

Thank you very much !

Now my last problem.... after restarting, it won´t boot a second time !
i have to replace the kextes in /system/library/Extensions

This ones:

- AD1988b.Fix.kext
- AHCIPortInjector.kext
- dsmos.kext
- IOAHCIBlockStorageInjector.kext
- JMicronATA.kext
- OpenHaltRestart.kext

then i tried "OSx86 Tools Utility" ...

"Repair Permissions" and "Set Extensions permissions"

it ends in this error-message:

http://img42.imageshack.us/img42/460...o20090829u.png

This Action works on my USB-HDD !
I had to replaced the files too...