Quantum A-Series User Manual

Modular Design

Quantum A-Series Tape Drives User’s Guide

31

1

The 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 

, 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.

1

The 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.

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