i have an EMC AX4-5i with a failed drive and have tried to use a drive with an identical model number to replace it by swapping out the drive in the drive module. I tried an HP 450GB SAS and a Dell Equalogic 450 SAS . Both are Seagate Cheetah 15.7 K with an identical drive model number. Does the EMC enclosure require the OEM drive and fail all others by design ? I have deleted all vitual disks and rebooted the enclosure. Thank you for any help with this.