The Adaptec 4070 controller is a premium, new technology hard disk controller
at an exceptional price!  Includes the following features:

        o  Supports up to 16 heads and 2048 cylinders (268 Meg/drive).

        o  Supports removable media drives.

        o  Supports wedge servo drives like: Syquest, Microscience, and Tulin.

        o  Controls both 5 1/4" and 3 1/2" ST506/412 type hard disk drives.
           These can be mixed on the controller at the same time.  (Controls
           two drives.)

Note:  The 4070 is an RLL controller.  It works only with drives which can
handle RLL format.  It is not recommended for older drives.  Many new drives
have been RLL certified and are sold as such for a premium price.  The big
advantage is that RLL gives 1.5 times more storage than MFM. (You cannot
use an IBM PC controller with hard drives on an Atari computer.)