Hi, Thank you very much Joe and Florian for your response. Actually this is part of a Embedded system. So my total root file system will be in flash which is read only. So I can not make root read write. I have another RW root also. but there is no problem like Unable to change tty /dev/tty1 : Read Only file System.It is working fine. Now regarding Hard Disk error,this same system is running in 2 machines so I think this is not problem of Hard Disk. When I remounted this Read only root as RW using 'mount -o remount,rw /' and again try to login then no problem it is working fine. I have tried to change TTYGRP and TTYPERM in /etc/login.defs as login proces using these 2 variables. I want to know due to this error is there any harm or problem in console operation? Ok waiting for your kind response. Thanking you in advance. Suhas.
O