That is very useful to know. I have a WD External hard drive but fortunately it is on NTFS.
The other problem I have had is some WD ext harddrives don't work well with the switch off sequence in Intellipanels. I got an Intellipanel panel altered by the manufacturer to increase the switch off delay to 11 seconds instead of the normal 5 or 6. That fixed it Good reliable hard drives though.