It is perhaps ironic that the I.D.S drive would lead to the discovery of an even faster method of travel, while the IDS uses principles similar to those discussed in the 21st Century Old Era for possible ‘Warp’ drive, it’s use to reach the Tau-Ceti system allowed humanity to discover the Verve Gravimetric Anomaly, the first proof that a Rosenberg-Einstein Bridge did actually exist. It’s study from 11C.E through to 72 C.E would lead humanity to the first primitive designs of the Rosenberg Drive.
The Drive itself functions by manipulating high energy gravimetric fields to warp and form a tunnel through the 4 dimensional fabric of space time, it in effect creates an instantaneous localized wormhole through which a ship utilizing the fields could travel nearly instantaneously from one point in known space to another within twenty light years though only the use of the I.D.S ‘field’ actually prevents the ship that is traveling from experiencing particle bombardment that would kill the crew.
While in theory the ship can travel to any point in space, in practice it has long been found that the drive itself tends to ‘couple’ to other gravity wells thus most R-Drive routes are from one system to another, coming out normally at the edge of the gravity well of the Star that has been targeted from which point the ship itself travels under Sub-light drive to its end destination.
It is also well known that in theory the drive can and should allow travel beyond the 20 Light Year radius limitation currently imposed even now almost 2,000 years since it’s discovery, however the limitation is caused not by a lack of understanding of how to create an R-Drive bridge over a longer distance but by the energy costs required to do so. The distance that the bridge forms and the energy required to form it go hand in hand and to date except on vessels captained by PILOT or Questar vessels, the energy required beyond 20LY travel exceeds the amount that can be stored by battery and reactor systems, especially given that as a ships size and mass increases as well the amount of energy required to create the field around it both I.D.S and R-Drive increases as well, making it impractical to-date to create a drive capable of larger jumps.
The Invention of R-Drive however did open the stars fully at last to Humanity and gave Birth to the Confederation itself.