Unable to Create Raid

WD External and Portable SSD External SSD for macOS
1

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.

2

Hello,

Maybe you should try contacting WD’s Technical Support about this. You can do so either by phone or email.

To Contact WD for Technical Support
http://support.wdc.com/contact/index.asp?lang=en

3

Did you format the drive before setting the RAID configuration? 

Try formatting the drive on MAC OS X Extended Journaled and then try to configure the RAID.

4

I tried all of this before I posted.  I think it is a limitation with the drive or OS.  I can write to the drive when it is not a raid, so I do not think it is a limitation of Lion being able to manage a drive of this site.  

5

Well the drive should work on Raid, if seen different capacity drives working just fine in the same setup. 

I will suggest to check on the apple forums to see if any one else got this error msg.