Hi all!
I use 4Tb My passport for 2 week. Then, when i start mac book at morning drive want be seen. I try change cable, usb port, computer. Mac OS X Disk utility don’t see drive.
WD utility see drive, show serial number, and say that there no partition. When i try to reformat drive in WD utility, it freeze around 60% for 5-7 min and then utility crashes 
I don’t need any data from drive (have backup),but want mount it and reformat for usage. How to fix this?
Thx!
Did you tried formatting the drive with Disk Utility?
Did you read my post?
“Mac OS X Disk utility don’t see drive”. How I can format drive with Disk utility, if Disk utility cant see it as device? Only WD discovery and WD drive utilities can see drive.
I would try to unplug the device, reboot the system, once fully rebooted open terminal. Type “diskutil list“
Take note of what drives show there. You should a list like /dev/disk0, then /dev/disk1…
Depending on how many storage devices you have plugged into your Mac the number of disks will vary. Typically 0 should be your hard drive.
Plug back in the WD hard drive.
Go back to terminal, run the command “diskutil list” and see if a new drive populates there. If one does take note of that number.
Next you’ll run the following command to reformat that drive to ExFAT.
diskutil eraseDisk ExFAT [DiskName] /dev/[DiskNodeID… ie disk1 or disk2]
Where there are brackets you will erase those and fill in what it’s asking for. Use a simple name for the drive like “backup” and make sure you have the right disk number listed.
A completed command line would look like this:
diskutil eraseDisk ExFAT backup /dev/disk1
Once that’s completed it should show up again in the disk utilities app and you can format it differently if needed.
If it’s still not showing up after running the diskutil list command, I would try plugging the drive into a windows machine and reformatting the drive in windows. You can use disk management similar as disk utilities. Choose again there ExFAT when reformatting. If still nothing the drive is probably not worth fixing.
diskutil don’t show drive Still, only WD utility see it. Trying to format as ExFAT with same result - freeze around 60%. Will try return drive by warranty. It will be my first broken WD from around 30 in use
Happy end. Drive replaced by warranty. Hope, this will work long, long time 
