I have a 1TB WD external HDD purchased about a year and a half ago which Ive never had problems with until now.
For the last week or so, Ive been having a really annoying problem where the HDD will *constantly* make read/write noises, as if it’s working on something, and will only stop when I access it. Eventually the noise will always start up unless I get it to perform an action.
You can see that this gets pretty annoying when Im working in my office and suddenly a “krrtz/tsch krrtz/tsch krrtz/tsch krrtz/tsch” noise starts up.
Since you posted in the External drives for mac I would assume you mac is a laptop and those laptops have a tendencey of not provideing enough power to the external drive. I would suggest that you obtain a power booster cable to seize this issue. You can call WD tech support to obtain one.If the noise still persits back up your data and if under warranty replace the unit.