Are Airport X-Rays Harmful To Certain Hard Drives?

An Anonymous Coward wishes to put this curious query before you all: "I have been through the airport many many times w/ my laptop and have never had any problems w/ losing my data on my 2.5" hard drive, but two work associates of mine have not had the same good fortune: they had both traveled and brought their destkop 3.5" drives with them and had their data compromised/destroyed as a result of having had them go through the standard carry-on luggage x-ray machine. The drives were not defective mechanically before having gone through just to clear up any misconceptions. Were these just fluke incidents or does the x-ray system @ airports actually destroy data on certain types of hard drives? Let's hear your opinions!" Any thoughts on this? Personally, I would think that desktop HDs would be more sensitive to the shocks and bumps inherent in travel than the X-ray machines at the airport.