The Desktop image of my 'MY BOOK' has disappeared from my desk top.The unit is (apparently) still working and the green light is on. I'm using Snow Leopard on my iMac.
The last update was February 2nd 2012 and was incomplete.
What has happened? Is it finished? Can it be repaired?
Why are they having so many problems with Snow Leopard?
Did you mean that the update on the Drive was not completed?
If that is the case the drive is corrupted and failed.
Did you check on Disk Utility to see if the drive shows there ( click go > utility > disk utility )
You might be able to repair the partition.
You can also try connecting to a windows computer and update the firmware.