Recording Format | Exabyte EXB-8505 8mm specification

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Recording Format

This chapter describes the recording formats used by the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. It includes information about the following:

Helical-scan recording

Physical format of the recorded tape

Logical format of the recorded tape

May 1994	EXB-8205 and EXB-8505	2-1
	(Standard and XL)

Image 37

Exabyte EXB-8505 8mm manual Recording Format

Contents

3URGXFW 6SHFLILFDWLRQ Disclaimer CopyrightTrademark Notices Revision History May Changes and Enhancements to This Manual Product Warranty Caution Contents Functional Description Requirements for Use Glossary Index Safety and Regulatory Agency Compliance Recording Format FeaturesFunctional Description Functional Specifications Tables Interface Specifications Intended Audience About This ManualHow This Manual is Organized EXB-8205 and EXB-8505 8mm Cartridge Tape Subsystems Related PublicationsLibraries and Enclosures Standards Conventions Used in This Specification Xiv Features Features Features 1Comparison of the four tape drives Read/Write Compatibility with Other Tape Drives Features 1Comparison of tape drive featuresSupported Formats Data format features Determining the Tape Format Data Compression Custom Eeprom Options Length Approximate Capacity to Leot a in MBytes Storage Capacity8500c Format 8200c Compressed Format b EXB-8505 EXB-8505XL Physical Description Front Panel Controls and IndicatorsDoor and Bezel LEDs Unload ButtonLabels Power Connector Scsi ConnectorBack Panel Components Ground Tab and Grounding Hole Scsi ID Jumper Block Resistor Terminators single-ended configuration onlyMonitor Port 5Internal components EXB-8505 shown Internal Components of the Tape Drive Tape Transport Mechanism Rotating Drum Assembly Servo Card SSV Lower Digital SLD Card Preamp and Upper Analog Cards 7External dimensions in inches and millimeters Size and Weight Integration with Other Exabyte Products Related ProductsEXB-210 8mm Library Mini Tabletop Cartridge Tape Subsystem 9Mini Tabletop CTSs with EXB-8505s installed Exatapeô Data Cartridges Features 5EXATAPE media compatibility with 8mm tape drives Exabyte Cleaning Cartridges Recording Format Recording Format Helical-Scan Recording Physical Track Structure Physical Format 510504 3Physical track structure for 8500 and 8500c format 8500/8500c Physical Track Structure 8200c and 8200 Physical Track Structure 5Physical track structure for 8200c track format 510504 Physical Blocks Servo Areas Search Fields 1Recording parameters Recording Parameters Supported Logical Formats Logical Format Logical Block Compression Logical BlocksLogical Block Packing 9Logical block packing one physical block 10Gap bytes one physical block Gap Bytes 11One gap block and one gap track in two physical tracks Gap Blocks and Gap Tracks Long Filemarks Filemarks2Type and size of filemarks for each format End of Data EOD Setmarks EXB-8505 and EXB-8505XL onlyShort Filemarks Track and Block Counts Lbot to Leot Leot to Peot 4Track and physical block counts for 8500 and 8500c formatsNumber of tracks Number of blocks Hex Decimal Functional Description Data Flow and Data Compression Write OperationsFunctional Description Logical Block CRC Data Compression Monitoring Streaming and Start/Stop Modes Motion Threshold Thresholds During a Write OperationReconnect Threshold Error Correction Code ECC Error Detection, Correction, and Recovery ProceduresCyclic Redundancy Check CRC Read-After-Write Checking 2Data flow during a read operation Read Operations Thresholds During a Read Operation Requirements for Use Requirements for Setting the Scsi ID Installation RequirementsRequirements for Use Requirements for Mounting the Tape Drive 2Mounting holes on the sides 4Mounting hole dimensions in inches and millimeters Terminators for Differential Configuration Terminators for Single-Ended ConfigurationRequirements for Scsi Bus Termination Impedance Requirements for Connecting a Scsi CableCable Length Primary Conductor Scsi Cable Connector Requirements Signal Pin Number 1Connector pin assignments for differential tape drives Ground Termpwr Operation Power-On ModeTape Drive Controls Device States 6LEDs on the faceplate of the EXB-8505 and EXB-8505XL LED states during operation LKey for m3 Loading Data Cartridges Load Time Unloading Data Cartridges Effect of PREVENT/ALLOW Medium Removal Command Resetting the Tape DriveError During Unload Procedure Using Scsi Commands Preventive MaintenanceCleaning the Tape Drive Time-to-Clean LED Indication Determining When the Tape Drive Needs CleaningRequest Sense 03h Command Loading New Microcode Size Dimensions Weight 4Single pack and multi-pack shipping dimensions and weightsShipping Requirements Shipping Cartons Unpacking and Packing Instructions Interface Specifications Interface Specifications Scsi FeaturesPhysical Path Data Transfer Rate 1SCSI messages Scsi MessagesHex Value Description Out Initiator to 2SCSI-2 command set Scsi CommandsCommand OP Code Description Receive Diagnostic Writing Data Using Scsi CommandsReading Data Erasing Data Copying Microcode Searching for DataInquiring About Tape Drive Status Setting Operating Parameters Performing Diagnostic TestsInquiry 12h Command LOG Sense 4Dh and LOG Select 4Ch Commands Functional Specifications Write and Read Access Times Performance SpecificationsFunctional Specifications 1Typical write and read access times File-Search Tape Speed Tape Speed3File-search tape speeds EXB-8205 and EXB-8205XL EXB-8505 and EXB-8505XL Rewind Tape Speed Reposition Time4Typical rewind times Size Length Typical rewind time Exatape a Seconds Tape Tension Release and Drum Motion Suspension Drum Rotation Period5Drum rotation periods Data transfer rates Reselection Phase TimeoutType Transfer 8500c a 8500 a 8200c Service Life Reliability SpecificationsMachine Reliability Mean Time Between Failures Mtbf Conditions for the Mtbf Value Test Conditions Restrictions for the Mtbf Value Data Integrity Conditions for Data Reliability Data ReliabilityRestrictions for Data Reliability Read Reliability Write Reliability 7Power specifications for standard voltages Power SpecificationsVoltages 8Power connector pin assignments Power ConnectorPin Number Assignment 2Chassis ground location on back panel Grounding Hole and Ground Tab 9Environmental specifications Environmental Specifications Point Temperature Humidity 10Temperature and humidity specificationsOperating Environment Particulate Contamination Limits Air Flow Requirements11Particle contamination limits 12Shock specifications Shock Specifications 13Vibration specifications Vibration SpecificationsRandom vibrationa applied during operation Random vibrationb applied during non-operationcand storaged Acoustic Noise Operating mode14Acoustic noise limits Safety and Regulatory Agency Compliance Safety and Regulatory Agency Compliance Safety Agency StandardsElectrostatic Discharge ESD Radiated Susceptibility Electromagnetic Compatibility EMC 510504 Glossary Glossary May Signal Driving a signal to the true state. assertion Index Mtbf Index Scsi 510504