Issue on boot VM linux backup

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Hello

Scenario

I have vmware VM with centos 5.7 and 2 hd (1 master + 1 for backup)

Now I test restore backup VM to other vmware host, the full image backup don't have the second HD (backup)

Restore work fine, but when start centos get error about filesystems .. if I add 2nd (empty) disk nothing change

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Now

I run VM and insert pswd root for maintenance

If I try to modify fstab for remove /backup line (disk removed) get "read-only file" :/

If I try to umount disck get :
umount : /dev/sdb1: not found
umount : /backup : not mounted

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Any idea ??

thanks