Have the compatibility issues in Mavericks been fixed yet?

[iMore Question]

I am worried about losing my image files if I upgrade to Mavericks from OS X 10.7.2. My files are currently stored on two external hard drives (a WD MyBook Studio and a LaCie). I have read that both of these makes are vulnerable to being wiped clean of all data when updating to Mavericks.was

 

[iOS Gravity]

They shouldn't get wiped if you unplug them before updating.