Abstract: A servo track writer head writes servo tracks on a data storage tape with increased accuracy. The servo track writer head includes a leading writer for each servo track. Each leading writer writes a synchronization field on the tape. The servo track writer head also includes a sequence of trailing writers for each servo track. Each trailing writer produces at least one trailing field on the tape a fixed distance behind the synchronization field. The servo track writer head also includes one timing writer. Each timing writer writes a timing field on the tape at a timing distance in the tape direction from each of the synchronization fields. The servo track writer head also includes a sequence of timing readers corresponding to each timing writer. The number of timing readers in the sequence is equal to the number of trailing writers in the sequence of trailing writers.

Abstract: A method of attaching a tape having longitudinal edges to a tape cartridge reel includes cutting an end of the tape non-perpendicularly to the longitudinal edges laterally across the width of the tape. The end of the tape is then attached to the tape cartridge reel. The method may also include cutting an end of the tape such that at least two of the laterally spaced apart servo stripes running longitudinally along the tape are cut at different longitudinal positions along the tape. The method may further include cutting the tape end such that at least two of the laterally spaced apart data tracks running longitudinally along the tape are cut at different longitudinal positions along the tape.

Abstract: Method and apparatus for monitoring bi-directional currents in a multi-phase brushless DC motor. The current in each separate phase is separately monitored to generate a feedback signal that is used to dynamically adjust the instantaneous levels of the winding currents in accordance with a specified torque required of the motor. Both negative and positive currents in the motor windings are monitored at all times to provide precision control of the feedback signals.