What kind of hard drive is inside MY PASSPORT ULTRA FOR MAC 4TB?

WD External Drives External Drives for Mac
1

What kind of hard drive is inside MY PASSPORT ULTRA FOR MAC 4TB?
Model No.: WDBPMV0040BSL

Тell me what drive inside? WD Blue or Black? or some other?

2

most probably a Blue (as seen in the video below) … but the only way to 100% verify it is to crack it open (voiding warranty) and take a look.