I found out disappearing of partition happens only when I have not properly shut down the Windows installation or hibernate it. It is nothing to do with ubuntu installation i guess
-- ntfs partitions disappear from desktop time to time https://bugs.launchpad.net/bugs/272736 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs