how to split???

[Vitali]

But i dont wanna remove anything from it and
later i wanna add all softwares and drivers packs of graphics and sound

If you wont to install your driver unattended, you must to have a $OEM$ directory on SAME disk witch i386 directory (windows install files directory)

"Hotfixes" are stored in i386\svcpack directory.. On same disk witch windows of course.

Any hotfix is a setup, like any another setup. You can integrate your hotfixes under "Software" too. In this case can hotfixes splited to another disk..
http://unattended.msfn.org/unattended.xp/view/web/57/