Mac users beware. Users who have upgraded to the latest version of OS X, Mavericks, have reported data loss on their external storage devices. This problem seems to affect Western Digital drives most. As a result Western Digital have issued the following warning to its customers:
As a valued WD customer we want to make you aware of new reports of Western Digital and other external HDD products experiencing data loss when updating to Apple’s OS X Mavericks (10.9). WD 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 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.
The WD Drive Manager, WD Raid Manager, and WD SmartWare software applications are not new and have been available from WD for many years, however solely as a precaution WD has removed these applications from our website as we investigate this issue.
They have also provided tips and instructions on how they might overcome this problem. According to reports, it is believed that the problem stems from a firmware issue with the drives.
However, Western Digital is not the only ones to be affected as users of Lacie's and Firmtek's eSATA Expresscards have also reported problems, as well as users of Promise Technology's Pegasus R4 Thunderbolt external RAID array.