Patent ID: 7525756

Claim:
A data storage library, comprising: a first rail having a first drive surface; a second rail having a second drive surface and oriented at an angle with the first rail; wherein the longitudinal axis of the first drive surface is at a first position and the longitudinal axis of the second drive surface is at a second position on a perpendicular axis that is perpendicular to the longitudinal axis of the first drive surface and the longitudinal axis of the second drive surface; and an accessor comprising: a drive mechanism configured to engage the first drive surface of the first rail to move the accessor along the first rail, and to engage the second drive surface of the second rail to move the accessor along the second rail; and a switching mechanism configured to move the drive mechanism along the perpendicular axis, wherein the switching mechanism positions the drive mechanism at the first position on the perpendicular axis to engage the drive mechanism with the first drive surface of the first rail, and positions the drive mechanism at the second position on the perpendicular axis to engage the drive mechanism with the second drive surface of the second rail; and the accessor comprising a guide wheel configured to engage a guide slot on the first rail to guide the accessor when moving along the first rail, and engage a guide slot on the second rail to guide the accessor when moving along the second rail; wherein the guide slot on the first rail includes an opening to allow the guide wheel to disengage from the guide slot on the first rail and engage the guide slot on the second rail.