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Theory of operations Chapter 7
Seagate Travan 40 Product Manual Page 119
Theory of operations
Overview
The Seagate Travan 40 drives provide a low-cost, high-performance minicartridge
backup system that is ideal for stand-alone users or small network computer
systems. With capacities of 20.0 Gbytes to 40.0 Gbytes dependent upon media and
data compression, this drive offers quick, efficient backup and restore operations. Its
throttle feature automatically selects the appropriate transfer rate—1.2 Mbytes per
second or 2.0 Mbytes per second—based on the speed of the operating system.
The Travan 40 drives are based on proven Seagate designs, Seagate firmware, and
the latest technology. This drive uses second generation, custom LSIs for efficient
circuit layout and increased reliability with low power consumption. The drives also
use flash EEPROM devices for easy firmware upgrades.
This chapter describes the drive in more detail and explains implementation specific
information.
Block diagram
The electronics of the STT2401A and STT3401A are laid out on one main printed
circuit board (PCB). Figure 18 shows a simplified block diagram of the drive.
IDE
Interface
Digital ASIC
buffer mgr.
ECC
RWW
512KB
DRAM
IDE ONLY
Read Channel
Write Driver
Stepper
Motor
Motor
Control
Head,
Non RWW
Capstan
Motor
Sensors:
-cartridge present
-write protect
-tape hole
256KB
EEPROM
(5 volt)
V20 uP
(10 MHz)
40 MHz
Crystal
Control Logic Module
Figure 18 Simplified block diagram for STT2401A and STT3401A
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