I recently purchased 2 WD Elements 2.5 TB drives, and I am running OSX Lion. I have repeated tried to create a raid, and I get this error:
POSIX reports: The operation couldn’t be completed. Operation not permitted.
I am using DiskUtility. I have tried mirrored, striped, and concatenated raid types. I have also tried extended journaled, extended case sensitive journaled, and FAT format types.
I’ve read some post that suggest you cannot use WD external drives for a raid? I am looking for help in getting this working. I prefer a mirrored raid for backups in case one drive goes out. I am using this for storing family photos, ect.