- ATTO ExpressPCI host adapters support hard drives, removable drives, tape drives, scanners and CD-ROM drives. Make sure each of these devices is configured and cabled properly under standard SCSI rules. All devices must have a SCSI 4.3 compliant driver to be compatible with the ATTO ExpressPCI DCs. (This will change with ATTO firmware version 1.6 and higher. Support for Legacy devices is currently being added. - Most new drives are shipped pre-formatted, but need to be initialized before they can be used. Use any recommended formatter/initializer that is SCSI 4.3 compliant to initialize the device.- Try to mount the drives manually using the formatting software the volumes were created with. - Check the termination on the ExpressPCI bus. If these are incorrect, drives will not mount.