HI, I have installed RHEL3 on an external USB drive. After installation and rebooting of the system, I get "Kernel Panic: VFS:Unable to mount root FS on 00:00" after grub comes up. If I try root (hd0,1) I get: Filesystem is ext2fs, partition type 0x83 kernel /vmlinuz-2.4.21-50.ELsmp ro root=LABEL=/ Error 15: File not found Press any key to continue Here is some more information: grub> root (hd0,1) (TAB) Filesystem is ext2fs, partition type 0x83 grub> kernel (hd0,1)/boot/ (TAB) .. and I get... grub> kernel (hd0,1)/boot/ grub> find /grub/stage1 (hd0,0) grub> root (hd0,0) Filesystem is ext2fs, partition type 0x83 grub> setup (hd0) checking if "/boot/grub/stage1" exists.. no checking if "/grub/stage1" exists..yes checking if "/grub/stage2" exists.. yes checking if "/grub/e2fs_stage1_5" exists..yes running "embed /grub/e2fs_stage1_5 (hd0)"... 16 sectors are embeded. succeeded running "install /grub/stage1 (hd0) (hd0)1*16 p (hd0,0)/grub/stage2 /grubconf"... succedded Done. after reboot I get the same error. Any idea how to fix this? thanks in advance.