The A590 has 20Mb embedded XT type hard deisk. Provides additional storage for your Amiga 500 and 500+. Plugs into the expansion bus on the left side of your Amiga 500. Autobotting System. No ned to format or configure thehard disk. Comes with Workbench installed. Easy Installation and operatoin. Small fan installed. Avoids overheating. SCSI and embedded XT interface. Allows for easy peripheral additions in the future. memory expansion up to 2 Mb. Improves productivity and effciency.