WD formatted to handle iphoto (MAC) corrupted? says READ ONLY

Hi! Need some help! Can’t access my iphoto library because the drive reads: 

“Caution: the i{hoto Library is on a locked volume. Relaunch iPhoto when the volume has read//write access or relaunch iPhoto with ,option key held down to choose another library”

I tried to change settings (I am the admin, it’s my personal laptop), nothing works and I cannot reformat it because all my photos are on! (> 200 Gb)

Hi and welcome to the WD community.

See if the steps from the following link help. 

https://discussions.apple.com/thread/2439930?start=0&tstart=0

Hi, sorry, no this is not the problem. The library is on my external but it suddenly went into read-only mode. The threats that you recommended do not apply. 

What format (NTFS, HFS+, FAT32, exFAT) are you using for the external hard drive?