![]() I tried this on both OS X 10.10 and 10.9 with the same fail result. However, the partition under the drive was greyed out and when I tried to Verify it, it failed. The engineer from WD had me check to see if the unmountable drive would appear in Disk Utilities and it did. So I used my OS X 10.9 computer to update the firmware on both drives from version 1015 to 1017 which did not help with the mounting issue but maybe that will help someone else with this problem. I first tried upgrading the firmware using the WD Universal Firmware Updater on my OS X 10.10 computer but there is a Java conflict that I couldn’t get past. ![]() But the drive that was off during the upgrade will mount on 10.10 or 10.9 just fine. The drive that was powered on during the upgrade will not mount in OS X 10.10 or on another computer I have running OS X 10.9. One was connected via Firewire and powered on when I upgraded to Yosemite and the other was powered off. I have two Western Digital My Book Studio II (RAID 0) 4GB external drives and both were on version 1015 of the firmware. ![]() I find that hard to believe but it’s plausible. ![]() They think that because my drive wasconnected during my Yosemite upgrade, it corrupted something.
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