Hello My Friend,
I am not sure which Mac and OS you are running under.
Which WD external product you have? MyBook Elite or Studio.
What firmware rev. ? Run WD Smartware/Settings/SetUpDrive/look to the lower left for firmware.
If you need the latest WD Smartware for Mac?
Here is the link to the latest WD Smartware Version 1.2.1.25 ( 03/11/2010) for Mac
http://www.wdc.com/wdproducts/updates/?family=wdsmartwaremac
FYI: I have WD MyBook Studio 2TB, MacBook Pro with OS 10.6 and have been working fine so far.
I can change the label name, invert the background from black to white and they are working fine.
