"root=/dev/hda8",have problem?

gprotection

when i usr 2.4.20-686 to up my system ,the kernel panic at  cann't find root and ask me to append a corret root position  .
but u can see in my conf file that 2.2.20 kernel can boot correctly while using the same argument
i used apt-get kernel-image-2.4.20-686  
why , t k u
---------------------------------------------my grub.conf:
default=1
timeout=10
splashimage=(hd0,6)/boot/grub/splash.xpm.gz
title Red Hat Linux (2.4.18-14)
        root (hd0,6)
        kernel /boot/vmlinuz-2.4.18-14 ro root=LABEL=/
        initrd /boot/initrd-2.4.18-14.img
title Windows XP
        rootnoverify (hd0,0)
        chainloader +1
title Debian Linux (2.2.20)
        root (hd0,7)
        kernel /boot/vmlinuz-2.2.20 ro root=/dev/hda8
title Debian Linux (2.4.20)
        root (hd0,7)
        kernel /boot/vmlinuz-2.4.20-686 ro root=/dev/hda8

#        initrd /boot/initrd-2.4.20-686.img

doooom

如果你的磁盘需要利用的模块不能加载或者没有内嵌，就可能出现这样的事情。
比如你是用scsi，raid，reiserfs，ext3.支持这些东西的模块最好内嵌在内核里面

sd444

2.4.XX-ARCH kernel image不支持reiserfs root分区
因为是将reiserfs做为模块，而非内嵌
jfs就不用说了