Formatting a 3TB MyBook to 512 Cluster Size?

This is not really about formatting. It's the USB enclosure itself that returns 4K physical / 4K logical sectors (even though the drive inside is a 512e drive) to the OS so to avoid the need for using GPT partitions on OSs that did not have GPT.
 
This concerns sector size, not cluster size. And what drescherjm says is most likely true: it is not the drive but it is the external casing. It increases the sector size of the drive to allow capacities higher than 2TiB without the need for GPT partition scheme.

Beware however that removing the drive from such an external casing would cause filesystem corruption, since your filesystem will not take kindly to suddenly seeing the harddrive as 512 byte sectors instead of 4KiB which it has been formatted with. So backup your data before removing it from the external casing. Then, once outside its casing, format it again. Then you can use it for whatever task you wish.
 
Are you sure it's the casing?
So there's no software solution, is that why the WD Quick Formatter app doesn't have the factory default option (512), even though this is the only solution that WD support offers?

I'll need to put the drive in a new external enclosure.


Would using True Image instead of Windows Backup make it work?
 
The encrypted 2.5 inch passport is a very different drive from the 3.5 inch mybook. This drive has virtual cd on the drive itself and has a USB connector on the drive itself it does not even have a SATA connector on the drive.
 
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