USB Thumb drives / memorysticks are the way to go.
They are FAT formatted so will work on the MAC / PC / Linux box - you can then copy files to them, unplug and plug into the
DENEB USB and the USB flash drive appears as an icon on Workbench. Double click on the icon and you can read/write all your files- just like a regular floppy drive.
A fast and easy way of getting data from the MAC to your A3000T