Patent ID: 7630165

Claim:
A data storage library, comprising: a first horizontal rail having a first drive surface; a second horizontal rail having a second drive surface and oriented at an angle with the first horizontal rail; wherein the vertical positioning of the first drive surface on the first horizontal rail is higher than the vertical positioning of the second drive surface on the second horizontal rail; and an accessor comprising: a drive mechanism configured to engage the first drive surface of the first horizontal rail to move the accessor along the first horizontal rail, and to engage the second drive surface of the second horizontal rail to move the accessor along the second horizontal rail; a switching mechanism configured to move the drive mechanism vertically, wherein the switching mechanism positions the drive mechanism at a first vertical position to engage the drive mechanism with the first drive surface of the first horizontal rail, and positions the drive mechanism at a second vertical position to engage the drive mechanism with the second drive surface of the second horizontal rail; and a guide wheel configured to engage a guide slot on the first horizontal rail to guide the accessor when moving along the first horizontal rail, and engage a guide slot on the second horizontal rail to guide the accessor when moving along the second horizontal rail.