Hidden files

After my last attempt to create a safepoint just hung…

I needed to get a backup so I plugged MyBook into a PC and formatted it as exFAT.  Powered down the MyCloud and plugged them both into a Mac.

Launched terminal and typed 'rsync -av /volumes/MyCloud /volumes/MyBook  BAM!!,  after a brief delay of building file list it started flying through my files.  But i noticed something odd…

There is a hidden folder and files '.wdmc/transcoded_files/…" for every item on my drive.  I have turned off media serving, and shut off iTunes support so all of those things should be gone.  They all appear to be .jpg files so I assume they are thumbnails for twonky or DLNA.  For some of my files there are multiples of these hidden files created if I modified the name.  So these files just keep getting created and never deleted?  

I forget the exact path but it sounds like the thumbnails for the WD apps. they can be stopped and disabled as below, they used to be a serious performance issue but are better in the newer firmware versions

to reverse change stop to start and disable to enable

/etc/init.d/wdmcserverd stop
/etc/init.d/wdphotodbmergerd stop

update-rc.d wdphotodbmergerd disable
update-rc.d wdmcserverd disable