Just about everything you'd ever want to know.
The drive is optional and acomdates either a 2.5 or 3.5 inch SATA drive.
This is an interesting and easy way to update. Download the files to a USB drive, plug it into the A-110 and browse to the install file.
These are the services that will run if you install an internal HDD.
This is accessible via the web console.
This can also be set via a web console.