My WDTV unit is DELETING my partially viewed movies!

I have a non-journaled mac formatted drive, and i’ve noticed that the WD is curiously killing off my media?  Any guesses.  I only have a mac, so no NTFS. Oh dear!  My firmware is the second most recent, and the drive is a terrabyte. 

When you are done watching your media, do you hit the “eject” button on the remote to remove the media drive.