Seagate STT20000A Product Manual page 7

Tape format
Theory of operations
STT20000A Product Manual
Mode Block Descriptor.................................................................................... 51
Mode Medium Partition Page.......................................................................... 52
Mode Capabilities and Mechanical Status Page.............................................. 52
Mode Tape Parameters Page ......................................................................... 53
Read command .................................................................................................... 54
Read Position command ....................................................................................... 55
Request Sense command..................................................................................... 57
Rewind command ................................................................................................. 59
Space command................................................................................................... 60
Test Unit Ready command.................................................................................... 61
Write command .................................................................................................... 62
Write Filemark command ...................................................................................... 63
Write Buffer (download microcode) command ....................................................... 64
Introduction........................................................................................................... 65
Tape partitioning ................................................................................................... 65
Track positions ..................................................................................................... 65
Track numbering................................................................................................... 66
Track format ......................................................................................................... 66
Frames........................................................................................................... 66
Blocks ............................................................................................................ 68
Tape reference servo pattern ................................................................................ 68
Write equalization ................................................................................................. 69
Randomization...................................................................................................... 69
Overview .............................................................................................................. 71
Block diagram....................................................................................................... 71
Drive mechanisms ................................................................................................ 72
Mechanics ...................................................................................................... 72
Cartridge-load mechanism .............................................................................. 72
Capstan/drive-motor assembly ....................................................................... 72
Chassis .......................................................................................................... 72
Control circuits ...................................................................................................... 72
Head design ......................................................................................................... 73
Flash EEPROM .................................................................................................... 73
Sensors and switches ........................................................................................... 73
Drive media (Travan minicartridges)...................................................................... 74
Table of Contents
65
71
Page vii