External Drives for Mac Experiencing Data Loss with Maverick OS -- UPDATED FOR NOVEMBER 6, 2013

--- Updated November 6, 2013 ---
On October 30th, 2013 Western Digital informed registered customers of affected products via E-mail regarding reports of Western Digital and other external HDD products experiencing data loss when updating to OS X Mavericks (10.9).  Our investigation to date has found that for a small percentage of customers that have the WD Drive Manager, WD Raid Manager and/or WD SmartWare software applications installed on their Mac, there can be cases of a repartition and reformat of their Direct Attached Storage (DAS) devices without customer acknowledgement which can result in data loss.  
WD has been tracking this issue closely through our WD Forum and through our Technical Support hotline and the occurrence rate of this event has been very low.  A specific set of conditions and timing sequences between the OS and the WD software utilities has to occur to cause this issue.  Should this event occur, the data on the product can likely be recovered with a third party software utility if the customer stops using the device immediately after the OS X Mavericks (10.9) upgrade.  WD will be issuing updated versions of these software applications that resolve this issue.
WD strongly urges our customers to uninstall these software applications before updating to OS X Mavericks (10.9), or delay upgrading until we provide an update to the applications.  If you have already upgraded to Mavericks,  WD recommends that you remove these applications and restart your computer.  If you have already upgraded to Mavericks and are experiencing difficulty in accessing your external hard drive,  please do not save anything to the drive, disconnect the drive from your computer, and contact Western Digital Customer Service at http://support.wdc.com/contact/.
--- Updated November 5, 2013 ---
There are reports of Western Digital and other external HDD products experiencing data loss when updating to Apple's OS X Mavericks (10.9).  Western Digital is urgently investigating these reports and the possible connection to the WD Drive Manager, WD Raid Manager and WD SmartWare software applications. 
Until the issue is understood and the cause identified, WD strongly urges our customers to uninstall these software applications on their systems before updating to OS X Mavericks (10.9), or delay upgrading.  If you have already upgraded to Mavericks, WD recommends that you remove these applications and restart your computer. WD has removed these software applications from our web site solely as a precaution as we investigate this issue.
If you have already upgraded to Mavericks and are experiencing difficulty in accessing your external hard drive, please do not save anything to the drive, disconnect the drive from your computer, and contact Western Digital Customer Service at http://support.wdc.com/country/ for further assistance.
You can now download the WD Software Uninstaller.  This utility will remove Mac WD SmartWare and WD Drive Manager software.  You can find the uninstaller under any of the Mac Drive Downloads sections such as the My Book Studio below.
http://support.wdc.com/product/download.asp?groupid=124&sid=214&lang=en

I agree. After installing Mavericks I was troubleshooting and reinstalling drivers for days. Many Apps did not work anymore, although the updates slowly arrive. As total divergence of the old Apple philosophy, I had to use endless library cleaning terminal commands to get a new Canon network printer running again. Canon provided the procedures after updating from OS X10.6 to 10.7 already. Now it seems, that the first time I used the Super Drive (CD-DVD Drive) trying to burn an audio CD with baffling error messages (Drive already used..). After this, the RAID1 status of the two MyBook archives changed to JBOD. The changes of OS X10.8 to 10.9 I find unnecessary (iBooks could be an App, Maps we have already the same on other channels). Some changes are even a step back (calendar graphics), the so much more user friendly Office suite iWorks is free, but degraded an of limited use!MadOverlord wrote:
I have had multiple cases of data loss on WD drives since upgrading to Mavericks, and I do not use any WD software. I was using a 4-bay PROBOX USB3 enclosure with 4 independant drives, each with 1 volume, no RAID. I have managed to copy large files off the WD drive onto my MBP internal drive using the finder, and then find that they are not identical. This problem is intermittent, does not generate any Finder errors, and the drives all show 100% health via SMART. The configuration was rock-solid before Mavericks, and has trashed the directories of 4 drives since I upgraded last week. I am attempting to find a solid replication case for this, but it is difficult. I have not been able to replicate the issue on another 2-bay USB2 dock that I have (different manufacturer). One thing is clear: only one thing changed -- I upgraded to Mavericks. 

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