wd15ears unreadable

i have a wd15ears drive in an external enclosure windows formatted it fine and everything and i have been writing to it for days but now windows doesn’t see it any more i can get active@file recovery to see it and read all data saying the drive is fine but windows says it is “unreadable” anyone have any ideas another software wont touch it because it says partition end must be greater than partition start any free sugestions alot of whats on the hdd is my only copy as i was freeing space on my main hdd i have a second wd15ears that will eventually mirror this drive was getting ready to copy when the drive quit reading

System is windows vista


I’ll suggest you to install the drive in the computer, just to verify the drive health.