My PowerBook is now about two years old and I shut it down last night, started it this morning and the HD icon has vanished from my desktop. Gone! Where is it?
Take a look under Finder/Preferences and then under the General tab has the option to show hard disks on the desktop become unticked for some reason?
No, you aren't losing your data. It is just a problem with one of the files that tells the computer what to display on the desktop. Everything is still there.
I still haven't figured out what exactly is wrong but I usually fix it by get info for the desktop folder, hit the gear button, apply to enclosed (might need to hit the lock button first), and restart.
Incidentally, in Finder, if I highlight a file in documents (for example) and click on path, the HDD is greyed out and cannot be clicked on. Almost as though it knows it should be there but it can't see it...