ATTO Technology today announced the availability of updated Mac OS X Panther drivers for its ExpressPCI Ultra320 and Ultra3 SCSI host adapters. Also released is an updated version of the ATTO Configuration Tool, which helps users customize the settings of their ExpressPCI SCSI host adapters, maximizing the performance of their storage connection. It may also be used to verify the drivers and flash files currently in use and update the flash, as necessary. ATTO says the new driver release provides up to a 40% performance increase on Writes and over 20% improvement on Reads over earlier releases.