Harddrive

My filesystm is damaged, I cannot make record in some files.
At users it is impossible to change passwords in WHM because at attempt of record in a file/etc/passwd there is a mistake - Error writing/etc/passwd: Read-only file system.

At attempt to activate shell access for an account in WHM:

===============
Shell Access Manager
Enabling shell access for user fotograf

Changing shell for fotograf.
Shell *NOT* changed. Try again later.
===============

Constantly there are the mistakes with write on a disk (/, /etc)

I EVERYDAY ran command in SSH:

===============
shutdown-rF now
===============

After that, all problems with file system are solved, but through some hours they again appear.

Attempt to create file in /

====================
Error writing tuning-primer.sh: Read-only file system
====================

FSCK solves my problems only at some hours.

Quote:

[root@*** unixbench-4.1.0-wht-1]# badblocks -vv /dev/hda
Checking blocks 0 to 78125000
Checking for bad blocks (read-only test): done
Pass completed, 0 bad blocks found.

I can ask to replace a hard disk, but whether it is necessary to do it? Whether it Requires replacement?