Drives disappear from desktop

Hi there. Have faced strange situation. Sometimes when I log into my Lion (iMac 2011) account I see all the links to my internal (I have SSD and HDD installed) drives and external (USB connected) drives and sometimes I can only see my SSD drive link on my desktop. In finder, however, all the drives are visible. And in finder preferences all the checkboxes are marked to show my drives on my desktop. How to solve?
Second question is how to automount NFS drive at login automatically? Is there any way except for putting it in fstab?
Thank in advance.

William,
No...because they are not showing up on disk utility. Only the two internal drives appear. Am I doing something wrong with disk utility?
benqq

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