Data Reliability | Exabyte EXB-8505 8mm specification

6Functional Specifications

Data Reliability

Data reliability is specified as a bit error rate (BER) in units of one error per total number of bits transferred to the host.

Conditions for Data Reliability

The conditions under which the specifications for data reliability apply are as follows:

The EXATAPE data cartridges used must comply with Standard

ISO/IEC 12246.

Data cartridges must be written and read on a tape drive that is in good operating condition and properly grounded.

Environmental conditions for the tape drive and the 8mm data cartridges must be maintained as specified in the “Environmental Specifications” section of this chapter.

The tape drive must be cleaned with an Exabyte or Exabyte-approved 8mm cleaning cartridge using the recommended cleaning procedure. Refer to EXB-8205 and EXB-8505 Installation and Operation for instructions.

Restrictions for Data Reliability

The following types of errors are not included in the determination of data reliability:

Errors caused by a failure of the tape drive

Errors caused by faulty or damaged cartridges or media

Errors caused by failure to comply with input power and grounding requirements, interference from external sources, or incorrect system operation or failure

Errors corrected by the tape drive’s ECC

Errors occurring in blocks other than blocks containing user data

6-10	EXB-8205 and EXB-8505	510504
	(Standard and XL)

Image 102

Exabyte EXB-8505 8mm manual Conditions for Data Reliability, Restrictions for Data Reliability

Contents

3URGXFW 6SHFLILFDWLRQ Trademark Notices CopyrightDisclaimer Revision History Changes and Enhancements to This Manual May Product Warranty Caution Contents Requirements for Use Functional Description Safety and Regulatory Agency Compliance Glossary Index Features Recording FormatFunctional Description Functional Specifications Interface Specifications Tables About This Manual Intended AudienceHow This Manual is Organized Related Publications EXB-8205 and EXB-8505 8mm Cartridge Tape SubsystemsLibraries and Enclosures Conventions Used in This Specification Standards Xiv Features Features Features 1Comparison of the four tape drives Features 1Comparison of tape drive features Read/Write Compatibility with Other Tape DrivesSupported Formats Data format features Data Compression Determining the Tape Format Custom Eeprom Options Storage Capacity Length Approximate Capacity to Leot a in MBytes8500c Format 8200c Compressed Format b EXB-8505 EXB-8505XL Front Panel Controls and Indicators Physical DescriptionDoor and Bezel Unload Button LEDsLabels Back Panel Components Scsi ConnectorPower Connector Ground Tab and Grounding Hole Resistor Terminators single-ended configuration only Scsi ID Jumper BlockMonitor Port Internal Components of the Tape Drive 5Internal components EXB-8505 shown Rotating Drum Assembly Tape Transport Mechanism Servo Card SSV Preamp and Upper Analog Cards Lower Digital SLD Card Size and Weight 7External dimensions in inches and millimeters Related Products Integration with Other Exabyte ProductsEXB-210 8mm Library 9Mini Tabletop CTSs with EXB-8505s installed Mini Tabletop Cartridge Tape Subsystem Exatapeô Data Cartridges Features 5EXATAPE media compatibility with 8mm tape drives Exabyte Cleaning Cartridges Recording Format Helical-Scan Recording Recording Format Physical Format Physical Track Structure 510504 8500/8500c Physical Track Structure 3Physical track structure for 8500 and 8500c format 8200c and 8200 Physical Track Structure 5Physical track structure for 8200c track format 510504 Physical Blocks Search Fields Servo Areas Recording Parameters 1Recording parameters Logical Format Supported Logical Formats Logical Blocks Logical Block CompressionLogical Block Packing 9Logical block packing one physical block Gap Bytes 10Gap bytes one physical block Gap Blocks and Gap Tracks 11One gap block and one gap track in two physical tracks Filemarks Long Filemarks2Type and size of filemarks for each format Setmarks EXB-8505 and EXB-8505XL only End of Data EODShort Filemarks Track and Block Counts Number of tracks Number of blocks 4Track and physical block counts for 8500 and 8500c formatsLbot to Leot Leot to Peot Hex Decimal Functional Description Write Operations Data Flow and Data CompressionFunctional Description Logical Block CRC Streaming and Start/Stop Modes Data Compression Monitoring Thresholds During a Write Operation Motion ThresholdReconnect Threshold Cyclic Redundancy Check CRC Error Detection, Correction, and Recovery ProceduresError Correction Code ECC Read-After-Write Checking Read Operations 2Data flow during a read operation Thresholds During a Read Operation Requirements for Use Installation Requirements Requirements for Setting the Scsi IDRequirements for Use Requirements for Mounting the Tape Drive 2Mounting holes on the sides 4Mounting hole dimensions in inches and millimeters Terminators for Single-Ended Configuration Terminators for Differential ConfigurationRequirements for Scsi Bus Termination Requirements for Connecting a Scsi Cable ImpedanceCable Length Scsi Cable Connector Requirements Primary Conductor 1Connector pin assignments for differential tape drives Signal Pin Number Ground Termpwr Tape Drive Controls Power-On ModeOperation Device States 6LEDs on the faceplate of the EXB-8505 and EXB-8505XL LKey for m3 LED states during operation Loading Data Cartridges Unloading Data Cartridges Load Time Resetting the Tape Drive Effect of PREVENT/ALLOW Medium Removal CommandError During Unload Procedure Preventive Maintenance Using Scsi CommandsCleaning the Tape Drive Request Sense 03h Command Determining When the Tape Drive Needs CleaningTime-to-Clean LED Indication Loading New Microcode Shipping Requirements 4Single pack and multi-pack shipping dimensions and weightsSize Dimensions Weight Shipping Cartons Unpacking and Packing Instructions Interface Specifications Physical Path Scsi FeaturesInterface Specifications Data Transfer Rate Hex Value Description Out Scsi Messages1SCSI messages Initiator to Scsi Commands 2SCSI-2 command setCommand OP Code Description Receive Diagnostic Reading Data Using Scsi CommandsWriting Data Erasing Data Searching for Data Copying MicrocodeInquiring About Tape Drive Status Inquiry 12h Command Performing Diagnostic TestsSetting Operating Parameters LOG Sense 4Dh and LOG Select 4Ch Commands Functional Specifications Functional Specifications Performance SpecificationsWrite and Read Access Times 1Typical write and read access times 3File-search tape speeds Tape SpeedFile-Search Tape Speed EXB-8205 and EXB-8205XL EXB-8505 and EXB-8505XL 4Typical rewind times Reposition TimeRewind Tape Speed Size Length Typical rewind time Exatape a Seconds Drum Rotation Period Tape Tension Release and Drum Motion Suspension5Drum rotation periods Type Reselection Phase TimeoutData transfer rates Transfer 8500c a 8500 a 8200c Reliability Specifications Service LifeMachine Reliability Mean Time Between Failures Mtbf Test Conditions Conditions for the Mtbf Value Data Integrity Restrictions for the Mtbf Value Data Reliability Conditions for Data ReliabilityRestrictions for Data Reliability Write Reliability Read Reliability Power Specifications 7Power specifications for standard voltagesVoltages Power Connector 8Power connector pin assignmentsPin Number Assignment Grounding Hole and Ground Tab 2Chassis ground location on back panel Environmental Specifications 9Environmental specifications 10Temperature and humidity specifications Point Temperature HumidityOperating Environment Air Flow Requirements Particulate Contamination Limits11Particle contamination limits Shock Specifications 12Shock specifications Random vibrationa applied during operation Vibration Specifications13Vibration specifications Random vibrationb applied during non-operationcand storaged Operating mode Acoustic Noise14Acoustic noise limits Safety and Regulatory Agency Compliance Safety Agency Standards Safety and Regulatory Agency ComplianceElectrostatic Discharge ESD Electromagnetic Compatibility EMC Radiated Susceptibility 510504 Glossary Glossary May Signal Driving a signal to the true state. assertion Index Index Mtbf Scsi 510504