there is no such thing as a 'MAC HD' or a 'PC HD', all HD are just blank bricks and formatted for either PC or Mac or for both (ExFat). On a side note, the 'WD for Mac' doesnt mean anything. (this is why SATA bridge issues are often called 'haunted hard drive syndrome', due to illogical behavior) However this bizarre behavior is actually typical for a dying SATA bridge card, they produce 4 extremely counter-intuitive diagnostic issues (as mentioned in the LINK). What you and most people dont understand (logically I see why) is that it makes 'no logical sense that it will mount on ONE machine and not another' (however as per your mention it would be a minor power variance to the SATA card as different slightly between the Mac and PC) You stated- 'It was connecting until the other day' (to the Mac) Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive. The format process can take up to several hours depending upon the drive size. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.Ħ. Click on the Erase tab in the DU main window.ĥ. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.Ĥ. Click on the Options button, set the partition scheme to GUID then click on the OK button. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Otherwise, click on the Partition tab in the DU main window.ģ. SMART info will not be reported on external drives. If it does not say 'Verified' then the drive is failing or has failed and will need replacing.

Note the SMART status of the drive in DU's status area.

After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. If you are preparing an external or a non-startup drive, then open Disk Utility in your Utilities folder.Ģ. When the menu bar appears select Disk Utility from the Utilities menu. After the installer loads select your language and click on the Continue button. If you have installed any WD software on your computer be sure to remove it completely.ġ. Completely repartition the drive and reformat.

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