I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go. When finished, you can mount your WD external hard drive on Mac and use. Provide a name and a format to erase the drive. Search for Create and format hard disks partitions and click the top result to open Disk Management. Select the unmountable WD external hard drive and click 'Erase' on the top. To unmount a drive with Disk Management, use these steps: Open Start. Go to Applications > Utilities > Disk Utility.
Tech Tool Pro and Disk Utility don't seem to be able to fix the drive, so I decided to wipe the data by a reformat and writing zeros to the entire drive.Įverytime I try and format, it tells me that the drive cannot be unmounted. Step 2: Fix WD external hard drive not mounting/showing up/recognized/detected on Mac by reformatting. The HDD has been acting up recently, very slow performance, bad behavior etc. If you simply unplug the USB stick from PC without using the little tray icon to detach the hardware correctly, the volume will be marked as not cleanly. On Linux, mounting drives is done via mountpoints on the virtual filesystem, allowing system users to navigate the filesystem as well as create and delete files on them. I have two internal drives in my 27" iMac (10.8.5). After creating disk partitions and formatting them properly, you may want to mount or unmount your drives.
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