I tried using a WD Passport Ultra ext usb HD for backup/restore purposes, not for simply copyNpaste of data folder/files.
WDPU HD has onboard/circuit board encryption that intercepts everything coming and going.
There is the matter of THE KEY, The Key being the software that must reside on the computer somewhere and which springs into action, whether or not there is a password [and if password set up - whether user-entered or auto-passed-through], whenever the WDPU is "sniffed" detected by the computer during boot/startup or later.
If anything happens to THE KEY [no matter if "logical error," if software clash, if the Cods no longer swim with you], you are toast, you will not be able to "enter" the HD. I think WDPU calls what I call "The Key" Smartware or something like that. And, The Key better reside and function on any usb or dvd boot process if trying to access WDPU from any kind of external-to-Windows boot
I tried to bypass both The Key software and the onboard encryption by a thorough NTFS format of my WDPU. I failed, the device never successfully read back my data folders and files.
I returned my WDPU hd to my local computer store.
The product is a very good product! For sure, it is great for saving data folders and files from home to school, from home to office, from home to print shops, and so on!
The above was my experience; what has been your experience?