We have tried both insert & assembly edit using a pre -striped tape & this still causes the problem. The deck is a Sony DSR 1500AP with SDI option. I will look in the manual to find out about the Capstain lock.
Thank you all for your help, the RAID is now working. After many hours of speaking with Apple, they have sent us a updated driver for the raid & everything works like a dream.
I have downloaded the latest firware & drivers from Atto’s web site & even tried using the older drivers. At the moment the unit is set up as 4 x raid5 slices (2 on each controller). These are then all striped in disk utility to give on 4.4TB. I will look further into the raid set-up. If you have any more advance that would be appreciated.