@dolbyman , Not concerned about the data as use it for archiving stuff I dont really need. Drive#5 had not ‘failed’(red light) until after the raid was re-built from drive#2 failing. It was also working fine 2 days ago. I am wondering how to/if i can resurrect it. I did chkdisk of drives 1+2 last night and no errors, but it wont add them back into the Raid array. Any thoughts down that path?. The format options etc are all ‘greyed out’. I could unmount the raid and see if I get more options? But i thought to ask here firstly. Cheers SG