Modular Design
Quantum A-Series Tape Drives User’s Guide 31
Data Control Module 1The Data Control Module (DCM) contains several of the functions and
features of LGMR technology, which is at the heart of the SDLT
technology. Of the five technologies that constitute the LGMR
technology, two are in the DCM. These are the POS and the MRC heads.
The main functions of the DCM are to provide the path and guides for all
tape motion inside the tape drive and to write data to and read data from
the tape. In addition to the POS and MRC heads described in Pivoting
Optical Servo and Magneto Resistive Cluster Heads, the DCM contains a
number of components that interact to perform these functions. These
components include:
• Advanced head guide assembly
• Take-up reel
•Drive motor
• Optical servo system
• Tape heads.
In addition to its mechanical components, the DCM also contains printed
circuit boards that control the functions of the DCM and the tape heads.
Tape Control Module 1The Tape Control Module (TCM) implements the functions required to
buckle and unbuckle the tape and control the tape motion. The TCM
consists of a variety of components:
• TCM Printed Circuit Board Assembly (PCBA)
• Base Plate
• Data Cartridge Receiver
• Positive Engagement Tape Leader Buckling Mechanism
• Tape supply motor assembly
• Floor plate assembly.
TCM PCBA 1
The TCM has its own PCBA that controls the functions of the TCM and
interfaces with the main controller board in the EIM. By designing the
TCM as a distinct module, it allows manufacturing and testing the TCM