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PYTHON 4352
User Manuals: Archive PYTHON 4352 DAT Tape Drive
Manuals and User Guides for Archive PYTHON 4352 DAT Tape Drive. We have
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Archive PYTHON 4352 DAT Tape Drive manual available for free PDF download: Product Description Manual
Archive PYTHON 4352 Product Description Manual (131 pages)
DDS-DC DATA COMPRESSION DAT TAPE DRIVES, 3.50/5.25-lnch, Internal Tape Drive, External Subsystem
Brand:
Archive
| Category:
Storage
| Size: 4 MB
Table of Contents
Table of Contents
4
Preface
9
Chapter 1. Introduction
10
Overview
10
Data Compression
10
Figure 1-1 Python 4322 OAT Drive
13
Figure 1-4 SCSI System Sample Configurations
16
Flash EEPROM
19
Software
19
About this Manual
20
Table 1-2. Chapter Descriptions
20
Chapter 2. Specifications
22
Overview
22
Physical Specifications
22
Figure 2-3 Python 4352 External Subsystem General Dimensions
24
Power Specifications
25
Table 2-3. Power Connector Pin Assignments (Models 4322 and 4542)
26
Table 2-4. Power Specifications for the Python 4352 Drives
26
Drive Performance Specifications
27
Environmental Requirements
28
OAT Cassette Specifications
28
Table 2-6. Environmental Specifications: Python DDS-DC Drives
28
Regulatory Compliance
29
Chapter 3. Installation
30
Introduction
30
Guidelines and Cautions (4322 and 4542 Internal Models)
30
Unpacking and Inspection
31
Cabling and Connectors
31
Cabling Considerations
31
Electrical Characteristics
31
Single-Ended SCSI Connector
32
Table 3-1. Single-Ended SCSI Connector Pin Assignments: Models 4322 and 4542
33
Installing the Python 4322 and 4542 Internal Drives
34
Table 3-2. Single-Ended SCSI Connector Pin Assignments: Model 4352
34
Figure 3-1 Python 4322 Switchbank Access
35
Setting Operational Switches
35
Figure 3-4. SCSI Device Address Selection (4322 and 4542)
38
Figure 3-5 JP6 External SCSI Address Port
41
Mounting the Drive Unit
41
Figure 3-6. Mounting Hole Locations (4322)
42
Figure 3-7. Mounting Hole Locations (4542)
43
Completing Connections
44
Figure 3-8. Power and SCSI Connectors
44
Installing the Python 4352 External Drive
45
Figure 3-9. Power and SCSI Connectors
45
Completing the Interface Connection
46
Figure 3-10 Python 4352 Rear Panel
46
Selecting the SCSI Address
46
Connecting the Power Cord
47
Figure 3-11 Daisy Chain Diagram
47
Chapter 4. Drive Operation
48
Introduction
48
Data Compression Operation
48
Front Panel LED Operation
49
Figure 4-1. Python 4322 Front Panel
50
Figure 4-2. Python 4542 Front Panel
50
Figure 4-3. Python 4352 Front Panel
51
Table 4-1. LED Summary
51
Loading/Unloading the Cassette
52
Loadinglunloading a Cassette (Normal Operation)
52
Figure 4-4 Cassette Loading (4322 OAT Drive)
52
Unloading a Cassette (Manual Operation)
53
Figure 4-5. Manually Removing a Cassette
54
Figure 4-6. Manually Removing a Cassette
55
Using a Blank Cassette
56
Figure 4-7. Manually Removing a Cassette
56
Using a Cassette Containing Data
57
Using a Prerecorded Audio Cassette
57
Loading Revised Firmware Via Archive Firmware Cassette
58
Chapter S. SCSI Interface
60
Introduction
60
SCSI-1 Interface
60
ANSI X3.131 Conformance Statement (SCSI-I)
63
SCSI-2 Interface
64
ANSI X3T9.2 Conformance Statement (SCSI-2) (Working Draft, Rev 10)
66
Chapter 6. Tape Formats
68
Introduction
68
DDS Format
68
DDS-DC Format
69
Commonalities between the Formats
69
Entities (DDS-DC Format Only)
70
Tape Layout
71
Single Data Space Layout
71
Device Area
72
Reference and System Area
72
Figure 6-1 Single Data Space Tape Layout
72
Figure 6-2 Reference and System Area Layout
73
Data Area
74
End-Of-Data (EOD) Area
74
Two-Partition Layout
74
Data Storage Organization
75
Figure 6-3 Two-Partition Tape Layout
75
Individual Track Layout
76
Main Area
76
Figure 6-4 Individual Track Layout
76
Subareas
77
Group Structure
78
Figure 6-5 Group Structure
78
Data Frames
79
ECC Frame
79
Index
79
Amble Frames
80
Indexing
80
Group Information Table (GIT)
80
Block Access Table (BAT)
81
Vendor Group
82
Read-After,Write
83
Chapter 7. Data Compression
84
Introduction
84
Data Compression Considerations
84
DCLZ Algorithm
85
Hardware Compression
86
Data Integrity
86
DCLZ Algorithm
86
Simplified Compression Operation
87
Table 7-1. Simplified Compression
87
Dictionary
88
Simplified Decompression Operation
89
Table 7-2. Simplified Decompression
89
AHA3101 Data Compression Chip
90
Chapter 8. Theory of Operation
92
Block Diagrams
93
Python DDS-DC DAT Drives
93
Figure 8-2 Block Diagram -- SCSI Controller Python Models 4322NT and 4542NT DDS-DC Drives
95
Figure 8-3 Block Diagram -- SCSI Controller Python Models 4322NP, 4542NP, and 4352XP DDS-DC Drives
96
Figure 8-4 Python State Diagram
97
Figure 8-5 Four-Head Design
98
Helical Scan Recording -- Four-Head Design
98
Figure 8-6 Alternate Azimuth Angles
99
Motors and Control Circuits
99
Audio Output Jack
101
Flash EEPROM
101
Sensors
101
Figure 8-7 OAT Cassette
102
Figure 8-8. Cassette Design Features
103
Table 8-1. Tape Lengths and Capacities
104
Chapter 9. Maintenance and Reliability
106
Maintenance
106
Head Cleaning
106
Automatic Drive Spin-Down and Write
107
Guidelines for High Temperature or Humidity Conditions
107
Reliability
108
Mean-Time-Between-Failure
108
Mean-Time-To-Repair
108
Table 9-1. Reliability Specifications
108
Appendix Aglossary of Terms
110
Appendix B. Acronyms and Measurements
114
Measurements
116
Appendix Cdata Compression
118
Introduction
118
MODE SELECT Page
118
Table C-1. Data Compression MODE SELECT Page
118
Compression Control
119
Decompression Control
119
Table C-2. DDE and RED Bit Configurations
120
MODE SENSE Page
121
Table C-3. Algorithms
121
Table C-4. Data Compression MODE SENSE Page
121
Compression Control
122
Decompression Control
122
Compression Algorithm
123
Decompression Algorithm
123
Request Sense Data
123
Implementation Notes
124
Table C-6. Sense Data Values and Descriptions
124
C.S.2 SCSI Command Operation for Noncompressing Modes
125
WRITE DATA BUFFER (3Bh)
127
C.6.L WRITE DATA BUFFER Command Descriptor Block
127
Table C-7. Command Descriptor Block: WRITE DATA BUFFER
127
Command Descriptor Block Field Descriptions
128
WRITE DATA BUFFER Data Header
128
Table C-8. Field Descriptions: WRITE DATA BUFFER Command Descriptor Block
128
Completion Status
129
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