Repartition and reformat the WD external drive. The problem is likely due to someone improperly disconnecting it.
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My Passport External Hard Drive Not Working Mac Os
Drive Partition and Format
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The frequent disconnections of your hard drive maybe because of a loose connection or a faulty hard drive rather than a problem with the hard drive. Check the USB port and or try plug in the hard drive into another USB port to see if it would solve the issue. How to use external harddrive - Setup manual for external harddrive.
1. Open Disk Utility in the Utilities folder.
2. After Disk Utility loads select the external hard drive (this is the out-dented entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the Disk Utility main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
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For late versions of OS X you will find that the Disk Utility display is different. The Partition and Erase controls are icons in the Disk Utility toolbar, but they function much the same as in the older version.
Dec 27, 2015 11:21 AM