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In a data media storage library for storing and accessing storage media, the storage media being contained in cartridges, the data media storage library having a library housing, an access opening in the library housing for inserting cartridges, a storage array within the library housing including a

In a data media storage library for storing and accessing storage media, the storage media being contained in cartridges, the data media storage library having a library housing, an access opening in the library housing for inserting cartridges, a storage array within the library housing including a number of storage locations, a plurality of media storage elements adapted to hold the storage media, a plurality of data transfer elements adapted to read and write information on the storage media, and a media transport element within the library housing adapted to move the storage media between the media storage element and the data transfer element, an import/export element which rotates the cartridge 180 degrees after moving the cartridge from the access opening to the media transport element, including: a cartridge holder adapted to receive the media cartridge from the access opening; a lead screw mounted in a first direction between the access opening and the media transport element and rotating about a first axis parallel to the first direction and a cartridge holder carrier engaging the lead screw and connected to the cartridge holder for translation of the cartridge holder along the first axis; a keyed nut threaded on the lead screw, the keyed nut having a first slot and a second slot, an intermediate point between the access opening and the media transport element, a first rail extending between the access opening and the intermediate point, and a second rail extending between the intermediate point and the media transport element; one of the first slot and said second slot engaging the first rail between the access opening and the intermediate point and engaging the second rail between the intermediate point and the media transport element; a horizontal gap between the first rail and the second rail at the intermediate point; a first bevel gear fastened to the keyed nut; and a second bevel gear meshing with the first bevel gear and a shaft driven by the second bevel gear and connected to the cartridge holder.

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In a data media storage library for storing and accessing storage media, the storage media being contained in cartridges, the data media storage library having a library housing, an access opening in the library housing for inserting cartridges, a storage array within the library housing including a

In a data media storage library for storing and accessing storage media, the storage media being contained in cartridges, the data media storage library having a library housing, an access opening in the library housing for inserting cartridges, a storage array within the library housing including a number of storage locations, a plurality of media storage elements adapted to hold the storage media, a plurality of data transfer elements adapted to read and write information on the storage media, and a media transport element within the library housing adapted to move the storage media between the media storage element and the data transfer element, an import/export element which rotates the cartridge 180 degrees after moving the cartridge from the access opening to the media transport element, including: a cartridge holder adapted to receive the media cartridge from the access opening; a lead screw mounted in a first direction between the access opening and the media transport element and rotating about a first axis parallel to the first direction and a cartridge holder carrier engaging the lead screw and connected to the cartridge holder for translation of the cartridge holder along the first axis; a keyed nut threaded on the lead screw, the keyed nut having a first slot and a second slot, an intermediate point between the access opening and the media transport element, a first rail extending between the access opening and the intermediate point, and a second rail extending between the intermediate point and the media transport element; one of the first slot and said second slot engaging the first rail between the access opening and the intermediate point and engaging the second rail between the intermediate point and the media transport element; a horizontal gap between the first rail and the second rail at the intermediate point; a first bevel gear fastened to the keyed nut; and a second bevel gear meshing with the first bevel gear and a shaft driven by the second bevel gear and connected to the cartridge holder. r signal being unavailable due to a defect during an operation of said head, wherein said at least one feedback filter includes a filter with identical peak-frequency, and with zero damping so that a filter state evolution is sustained without any substantial dissipation of a filter sinusoidal amplitude while preserving the amplitude during said operation. 6. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head; and a dedicated PES memory buffer operatively coupled to said at least one feedback filter, a pseudo-PES stream being extracted and input to said at least one feedback filter such that a state of said at least one feedback filter is sustained during said operation. 7. The system according to claim 6, wherein at the end of said operation, an input to said at least one feedback filter is replaced by a newly measured PES stream, and wherein said PES memory buffer is continuously refreshed, while said head is in a track-follow mode, with a most recent PES stream, as indexed by a sector number of a disk regardless of a track number of the disk. 8. The system according to claim 7, wherein said memory buffer retains the most recent disturbance characteristics of said drive. 9. The system according to claim 8, further comprising a spindle for rotating the disk, wherein when a disturbance frequency is substantially an integer multiple of a rotating speed of the spindle, a length of the PES memory buffer is exactly equal to a total number of servo sectors in a track of said disk. 10. The system according to claim 9, wherein if the disturbance frequency is lower than that of the spindle speed, the length of the PES memory buffer is extended to cover a complete cycle of a slowest frequency of interest. 11. The system according to claim 10, wherein individualized address pointers are allocated for each disturbance component that corresponds to a non-integer multiple of the spindle rotating speed, said address pointers being offset by a number that is computed to be a function of its period. 12. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; and a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head, wherein one of a stored-PES and a null-PES is provided to said at least one feedback filter. 13. The system according to claim 12, wherein the Stored-Pes buffer is refreshed when a red or a write operation by said occurs. 14. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; and a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head, wherein a transition from a damped to an undamped characteristic of said at least one filter is performed to maintain an amplitude of said PES with phase continuity. 15. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; and a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head, wherein said controller comprises a track-follow controller, and wherein said at least one feedback filter comprises a second filter coupled in parallel to said track-follow controller. 16. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; and a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head, wherein said mechanism comprises first and second buffers for processing a non-integer multiple of a fundamental harmonic frequency. 17. A disk drive system, comprising: a head; a controller for controlling an operation of said head; at least one feedback filter coupled in relation to said controller; a mechanism for keeping a function of said at least one feedback filter active during any of an absence of a valid position error signal (PES) and a position error signal being unavailable due to a defect during an operation of said head; an actuator coupled to said head; and a gain adjustor coupled to said at least one feedback filter, such that when said at least one feedback filter has a predetermined phase and an amplitude changes with a radial location of an actuator, said gain adjustor adjusts a gain. 18. A method of sustaining a filter state in a disk drive system including a head, comprising: activating a feedback filter of the disk drive system; storing a position error signal (PES) associated with said head with said filter activated; and disconnecting said filter during a predetermined operation but maintaining an activation of said filter such that a filter state computation is continued during said predetermined operation, such that said filter state computation is sustained using one of a stored position error signal (PES) and a Null PES signal. 19. The method according to claim 18, further comprising: storing the PES only for a full period of a disturbance cycle, a filter state history not being stored for initialization. 20. The method according to claim 18, further comprising: connecting said filter during a read or write operation by said head; and refreshing the stored PES in a stored PES buffer. 21. The method of claim 18, wherein with said Null-PES input provided to said feedback filter, during said operation, said feedback filter is allowed to coast along as in a track-following mode. 22. A disk drive system, comprising: a first drive generating a first frequency self-vibration component; a second drive generating a second frequency periodic vibration component that impacts a position error signal (PES) of the first drive; and first and second feedback filters configured at the first and second frequencies and respectively coupled to receive outputs from said first and second drive, such that a state of said first and second filters is maintained during a predetermined operation of said drive system. 23. The disk drive system according to claim 22, wherein said disk drive is for being housed in a computer chassis and for use with a spindle, a disk for being rotated by said spindle, and a head for reading and writing to said disk, and wherein said first drive is located in a first portion of a computer chassis, said first drive generating a first frequency self-vibration component generated by spindle imbalance. 24. The disk drive system according to claim 22, wherein during a track-follow mode, the filter states are active and then the filters are disconnected from a feedback loop during a seek operation, wherein as the disk drive system enters the track-follow mode subsequent to the seek operation, the filters are activated with a zero initial condition. 25. The disk drive system according to claim 22, wherein a