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Содержание ProDrive 40S

Страница 1: ...Rev A Date 6 88 Quantum ProDrive Series Intelligent Disk Drives ProDrive 40S 80S Product Manual Quantum Corporation 730 00 9302...

Страница 2: ......

Страница 3: ...Rev A Date 6 88 Quantum ProDrive Series Intelligent Disk Drives ProDrive 40S S0S Product Manual Quantum Corporation 730 00 9302...

Страница 4: ...ii...

Страница 5: ...ation No 730 00 9302 Rev A UUCSANDE UL recognition granted under File No E78016 CSA certification granted under File No LR49896 VDE certification granted per File No 11342 3250 2003 AIA WARRANTY Quant...

Страница 6: ...uantum Service Center 1804 McCarthy Boulevard Milpitas California 95035 408 432 1100 iv SERVICE CENTERS Quantum Gmbh Hanstrasse 70 0 6000 Frankfurt M 71 West Germany Phone 49 69 6666167 Telex 4 17 166...

Страница 7: ...ING CABLE CONNECTORS 2 6 2 3 1 DC Power Connector 2 6 2 3 2 ICon r 2 6 2 4 ClF ERA 2 7 2 4 1 General Procedures 2 7 2 4 2 Self SeekTest Option 2 8 2 4 3 Enable Parity Option 2 8 2 4 4 Wait Spin Option...

Страница 8: ...ndition 5 7 5 3 2 RESET Condition 5 7 5 4 SCSI BUS PHASE SEQUENCES 5 7 5 4 1 Non Arbitrating Systems 5 7 5 4 2 Arbitrating Systems 5 7 5 4 3 All Systems 5 8 5 5 SCSI Fl INI EfIS 5 9 5 6 MESSAGE SYSTEM...

Страница 9: ...hex 5 62 VERIFY Command Opcode 2F hex 5 63 READ DEFECT DATA Command Opcode 37 hex 5 64 WRITE BUFFER Command Opcode 3B hex 5 66 READ BUFFER Command Opcode 3C hex 5 67 READ LONG Command Opcode E8 hex 5...

Страница 10: ...8 READ Command 5 36 5 19 WRITE Command 5 37 5 20 SEEK Camland 5 38 5 21 INQUIRY Camland 5 39 5 22 INQUIRY DATAFormat 5 39 5 23 MODE SElECT Command 5 41 5 24 MODE SELECT Parameter list 5 42 5 25 RESERV...

Страница 11: ...7 3 1 AoOWeExploded VtfNI 3 1 3 2 M Filbc dion 3 3 3 3 Head Positioning Electronics 3 4 3 4 FteaiWriIe Block DacJram 3 5 4 1 SCSI Bus Pin Assignments 4 2 4 2 SCSI BusTrring Diagram 4 7 5 1 Phase Sequ...

Страница 12: ...x...

Страница 13: ...42 and 84 megabyte versions respectively 1 1 1 APPLICABLE DOCUMENTS This document provides a general description of the ProDrive 40S 80S including installation principles of operation interface comma...

Страница 14: ...and Vibration Table I I lists specified levels for shock and vibration applied to any of the three mutually perpendicular axes the principal drive base axes The term operating implies that the drive w...

Страница 15: ...e command overhead or latency time Seek time is the time required for the actuator to seek and settle on track Seek times are measured by averaging 1000 seeks of the indicated length Average seek time...

Страница 16: ...ix C for information on defect handling 3 Defect errors are those which exhibit a repeating error pattern i e the error occurs twice in a row within eight retry reads and cannot be read without error...

Страница 17: ...ULATIONS The ProDrive disk drives satisfy the following standards and regulations a U L b CSA SDA c VDE d FCC Standard 478 Standard for Safety Electronic Data Processing Units and Systems Standard C22...

Страница 18: ...Section 1 General Description and Specifications This page intentionally left blank 1 6 General Description and Specifications...

Страница 19: ...ProDrive disk drives are shipped with a faceplate installed and shock mounts mounted directly to the base casting Figure 2 1 shows the external dimensions ofthe drives 104 2 438 All dimensions in mil...

Страница 20: ...STY FIGURE 2 2 ProDrive Packing Assembly PackinK Assembly Item Descrjptjon A Shipping Container 8 pack B Internal Padding C ProDrive Disk Drive D Package inserts NOTES After unpacking the disk drive s...

Страница 21: ...llimeters FIGURE 2 3 ProDrive Mounting Dimensions The base casting is very close to the drive mounting bracket Mounting 9OF ew kmg ths must be chosen so that no more than the specified length of screw...

Страница 22: ...nd current requirements of the DC Power supplied to the drive are listed below No power sequencing either OFF or ON is required by the ProDrive Power requirements include SCSI terminator power Voltage...

Страница 23: ...e powering up or down as well as the shorting out or opening up of either voltage or return line Power Reset Limits 5 Volts 4 6 to 4 5 Volts 12 Volts 10 2 to 9 6 Volts When powering up the drive will...

Страница 24: ...Power Connector 12 2 3 2 SCSI CONNECTOR One SCSI cable connector JI is required for the ProDrive Details of the signals required can be found in Section 4 SCSI Interface Connection to 11 is through a...

Страница 25: ...ugs and terminators on the Printed Circuit Board which control these options In addition to the optional hardware configurations described below ProDrive operation can also be affected by many optiona...

Страница 26: ...in option disabled 2 4 5 SCSI BUS DEVICE IDENTIFICATION The SCSI bus can support up to eight devices including the host system The identity number determines the priority level of each device so caref...

Страница 27: ...CHANISM The drive mechanism consists of the mechanical subassemblies which are sealed under a metal cover These subassemblies are not adjustable nor are they field repairable Please refer to Figure 3...

Страница 28: ...ring shaft The magnets are composed of two alternating poles bonded to the magnet plates which in tum are bolted to the base casting The rotor and hub are molded together The shaft is pressed into the...

Страница 29: ...ing within the drive be kept free of particles To this end the drive is assembled in a Class 100 purified air environment then sealed with a metal cover During the life of the drive the rotating disks...

Страница 30: ...e by an on chip AID converter on the microcontroller The controller uses these values to calculate the slope of the expected track position error line from outside to inside of each surface These valu...

Страница 31: ...g data as belonging to the target sector s the data sequencer portion converts the NRZ serial bit stream into an 8 bit word The DMA portion of SOLO then feeds this word to the cache buffer RAM The int...

Страница 32: ...rom or onto the bus by RD read status from the controller chip or WR write to the ontroller chip if the address selects the chip The microprocessor can also command SPICY to perform data transfer oper...

Страница 33: ...ws more than one option When more than one option is allowed and only one option was implemented the decision as to which option to implement was based on the following 4 3 4 3 1 All SCSI bus drivers...

Страница 34: ...must have the following characteristics measured at the drive True Signal Assertion 0 0 to 0 8 Vdc False Signal Non Assertion 2 5 to 5 25 Vdc A 50 pin connector is provided at position J1 for connect...

Страница 35: ...ator True indicates input to the initiator This signal is also used to distinguish between SELECTION and RESELECTION phases MSG MESSAGE A signal driven by a target during the MESSAGE phase REQ REQUEST...

Страница 36: ...P BUS FREE None None None None None ARBITRATION All Winner None None SCSIID SELECI10N I T Initiator None Initiator Initiator RESELECTION I T Target Target Initiator Target COMMAND Target None Target...

Страница 37: ...an SCSI device must wait from its detection of the BUS FREE phase BSY and SEL both false for a bus settle delay until its assertion of BSY when going to the ARBITRATION delay BUS SET DELAY 1 8 microse...

Страница 38: ...quired to ensure that a target or initiator does not assert BSY after a SELECTION or RESELECTION phase has been aborted This is not the selection timeout period SELECTION TIMEOUT DELAY 250 millisecond...

Страница 39: ...s data 17 0 P handshake s after BSY data bus waits a minimum of REG The Initiator I to their desired values walts at of this phase t becomes L The Initiator waits one Bus Clear Delay drives data 7 0 P...

Страница 40: ...Section 4 SCSI Interface This page intentionally left blank 4 8 SCSI Interface...

Страница 41: ...be released by SCSI devices within a bus clear delay after BSY and SEL become continuously false for a bus settle delay If a device requires more than a bus settle delay to detect the BUS FREE phase...

Страница 42: ...rt the desired target s SCSI 10 and its own initiator SCSI ID and the parity bit if parity checking is implemented on the OATA BUS After two deskew delays the initiator must assert SEL See Section 5 2...

Страница 43: ...serted and has delayed at least a bus clear delay plus a bus settle delay The ProDrive becomes a target by asserting the I O signal It will also set the DATA BUS to a value that is the OR of its SCSI...

Страница 44: ...lse Additionally during the infonnation transfer phases the ProDrive will continuously envelope the REQ ACK handshake s with C o 1 0 and MSG in such a manner that these control signals are valid for a...

Страница 45: ...REQ DB 7 O P will be held valid for at least one deskew delay plus one cable skew delay plus one hold time after the assertion of REQ The ProDrive will assert REQ for at least an assertion period It...

Страница 46: ...e REQ ACK handshake s of this phase It will handshake byte s in this phase until ATN goes false If the ProDrive receives all the message byte s successfully i e no parity errors it will change to any...

Страница 47: ...n takes precedence over all other phases and conditions SCSI devices create the RESET condition by asserting REQ for a minimum of a reset hold time During the RESET condition the state of all SCSI bus...

Страница 48: ...ransfer phases A phase type may even be followed by the same phase type for example a data phase may be followed by another data phase FIGURE 5 1 Phase Sequences without Arbitration ESET CONDITION COM...

Страница 49: ...ointers to their saved values by sending a RESTORE POINTERS message 5 6 2 to the initiator The initiator moves the saved value of each pointer into the corresponding current pointer Whenever a device...

Страница 50: ...TRANSFER REQUEST In Out 02H SAVE DATA POINTER In 03H RESTORE POINTERS In 04H DISCONNECT In INITIATOR DETECTED ERROR Out ABORT Out 07H MESSAGE REJECT In Out 08H NO OPERAnON Out 00 MESSAGE PARITY ERROR...

Страница 51: ...zes that negotiation is required it asserts ATN sends a SYNCHRONOUS DATA TRANSFER REQUEST message indicating a REQ ACK offset and minimum transfer period The REQ ACK offset is chosen to prevent initia...

Страница 52: ...ut first receiving a DISCONNECT or COMMAND COMPLETE message it should consider it a catastrophic error condition The initiator should not save the data pointer as a result of this message INITIATOR DE...

Страница 53: ...istinguish an IDENTIFY message from the other messages Bit 6 This bit is set to one only by the initiator When set to one it indicates that the initiator has the ability to accommodate disconnection a...

Страница 54: ...D COMMAND OBH and the sense code set to Message reject error 43H SAVE DATA POINTERS Same procedure as for DISCONNECT message 5 7 COMMAND IMPLEMENTATION This section defines the SCSI commands supported...

Страница 55: ...opcodes operation codes for Groups 0 and 1 are listed in Table 54 TABLE 5 4 Commands Supported By ProDrive OPCODE COMMAND SECTION OOJI TEST UNIT READY 5 11 1 01H REZEROUNIT 5 11 2 03H REQUEST SENSE 5...

Страница 56: ...For 10 byte commands acceptable values are OOOO FFFFH A value of transfers no blocks 5 7 1 5 Vendor UniQue VU Vendor unique bits allow for slight command modifications or special conditions to be sel...

Страница 57: ...resents the status bytes Table 5 7 defines the status codes as implemented on the ProDrive TABLE 5 5 Status Byte Bit 7 6 I s 4 I 3 1 1 1 1 0 Byte VENDOR 0 RESERVED VENOOR UNIQUE STATUS BYTE CODE 1 I J...

Страница 58: ...VICE This code is issued when a device attempts to access a reserved area in which case the command will be rejected See RESERVE command 5 9 READING AND WRITING 5 9 1 LOGICAL BLOCKS The basic function...

Страница 59: ...his shorter command format is used opcodes 08H and OAH a transfer length of zero means transfer 256 blocks during the command The number of bytes transferred during the DATA phase following the comman...

Страница 60: ...t Mode Table is stored in RAM This table is referenced whenever there is more than one possible way for the drive to behave In the previous example the initiator will have set the Retry Count in the C...

Страница 61: ...table 5 11 COMMAND DESCRIPTIONS Following are descriptions of the individual commands listed in Table 5 4 Refer to the REQUEST SENSE command Section 5 11 3 for a description of error codes and sense k...

Страница 62: ...he sense data be sent to the initiator The sense data applies to the previous command from the same initiator Sense data is saved for an initiator until it is retrieved by that initiator or until anot...

Страница 63: ...d data ERROR CLASS AND CODE Byte 0 Bits 6 0 Set to 70H to indicate extended status SEGMENT NUMBER Byte 1 Set to zero for the ProDrive FM nLE MARK Bit 7 Byte 2 Indicates that a filemark has been read s...

Страница 64: ...5 are vendor unique BPV BIT POINTER VALID Byte 15 Bit 3 Set to zero indicates that the bit pointer field is not valid A BPV bit set to one indicates that the bit pointer field Bits 0 2 is valid BIT PO...

Страница 65: ...le NOT READY Target cannot be accessed Operator intervention may be required to COlTCCt this condition No additional infonnation Drive recalibrating Drive not up to speed Drive waiting for command to...

Страница 66: ...Cfailure Power on failure Message reject Finnware error Reselect timeout No digital PI or P2 signal Analog PI or P2 are bad Failure writing to format parameter RAM Rejected message was not sent Unexpe...

Страница 67: ...initiator while active Bad BPBIBPS Invalid sector Invalid period or offset in sync message Active initiator attempted another select Defect list out oforder Badparameter s in mode page UNIT A1TENTION...

Страница 68: ...nnatted when shipped from the factory with data being undefined NOTE Issuing this command typically causes loss of data even when the repetitive data pattern option is not used All data should be back...

Страница 69: ...s the interleave factor Any value specified in this field by the initiator will be ignored by the ProDrive The ProDrive uses a 1 1 interleave TABLE 5 14 FORMAT UNIT Command Variations Bit Reference De...

Страница 70: ...LE CERTIFICATION Byte 1 Bit 5 Not supported by the ProDrive Must be set to zero by the initiator STPF STOP FORMAT Byte 1 Bit 4 Not supported by the ProDrive Must be set to zero by the initiator 5 11 4...

Страница 71: ...1 I 0 1 0 I RESERVED 0 2 3 lMSBl DEFECI LENGTH 0 LSB NOTE The list of grown defects will be erased 2 Format with original factory defects only FORMAT UNIT Command Bit 7 I 6 I 5 I 4 I 3 I 1 I 1 I 0 By...

Страница 72: ...I 3 I 2 I I I 0 Byte 0 RESERVED 0 1 1 I 1 I 0 I 0 I RESERVED 0 2 3 MSB DEFECT LENGTH 0 LSB NOTE The list of grown defects will be erased 4 Format with existing defects factory and grown defects The d...

Страница 73: ...e defect descriptor blocks follow the defect list header 6 Format with provided defects in addition to factory defects discard existing grown defects FORMAT UNIT Command Bit 7 I 6 I 5 I 4 I 3 J 2 I 1...

Страница 74: ...The existing list of grown defects will be added with the provided defects becoming the updated grown defects 8 Format with provided defects in addition to existing defects FORMAT UNIT Command Bit 7...

Страница 75: ...ve block address will be added to the drive s field replacement defect map NOTES The REASSIGN BLOCKS command should not be used to redundantly reassign defective logical blocks which have already been...

Страница 76: ...MEDIUM ERROR The logical block address of the first logical block not reassigned will be returned in the information bytes of the sense data 5 11 6 READ COMMAND OPCODE 08 hex The READ command Table 5...

Страница 77: ...the dual processes of filling and emptying the buffer The ProDrive will not disconnect unless the initiator sends an IDENTIFY message with the I Support Disconnect bit bit 6 set If disconnect is suppo...

Страница 78: ...keep up and the buffer empties In tum the SCSI to buffer transfer will temporarily halt if the buffer to disk transfer process falls behind and the buffer fills completely The disconnect reconnect str...

Страница 79: ...transferred to the initiator whichever is less For the ProDrive an allocation length of 130 82H is recommended 5 11 9 2 INQUIRY DATA Format TABLE 5 22 INQUIRY DATA Format Bit 7 I 6 I 5 I 4 I 3 I 2 I 1...

Страница 80: ...he allocation length of the command descriptor block is too small to transfer all of the vendor unique parameters the additional length value will not be adjusted to reflect the truncation ProDrive DR...

Страница 81: ...I LUN O I RESERVED 0 I SP 2 RESERVED 0 3 RESERVED 0 4 PARAME1ER UST LENG1H BYTES S VU O I RESERVED O I F I L When the ProDrive is powered on and the motor spins up the most recent set of device parame...

Страница 82: ...0 LSB 4 RESERVED 0 5 7 MSB BLOCK LENGTH LSB page D escrlptor s 0 RESERVED 0 I PAGE CODE t PAGE LENGTH 2 ton REFER TO PAGE DESCRIPTION MEDIUM TYPE Byte 1 Set to zero for default currently mounted medi...

Страница 83: ...SENSE command Each time a page is referenced all parameters on that page must be specified Changeable parameters may be set to any acceptable values non changeable parameters must be set to zero The...

Страница 84: ...is zero or RC is one this bit is ignored The default is zero PER POST ERROR Byte 2 Bit 2 Set to zero indicates that the ProDrive will not create the CHECK CONDITION status for errors recovered within...

Страница 85: ...ARRE AUTOMATIC READ REALLOCATION ENABLED Byte 2 Bit 6 Set to one indicates that the ProDrive will enable automatic reallocation of bad blocks The execution of the automatic reallocation is similar to...

Страница 86: ...ead retries are attempted until good data is read stable syndrome is obtained or the retry count is exhausted Ifneeded ECC is invoked if correction is possible Data transfer is stopped upon error dete...

Страница 87: ...nts 50 full and so on Each bit is equal to 1 256th of the maximum buffer size The default value is 0 at least 512 bytes must be transferred to the buffer before reconnection Buffer Empty Ratio Byte 3...

Страница 88: ...KS PER ZONE 0 eLSB 8 MSB ALTERNATE TRACKS PER VOLUME 0 9 ALTERNATE TRACKS PER VOLUME 0 LSB Track Format Field to MSB SECTORS PER TRACK 0 11 SECTORS PER TRACK 0 LSB Sector Format Fields 12 MSB OATA BYT...

Страница 89: ...T data This implies that the ProDri e set an equal number of sectors per track accordingly The ProDri e has 512 data bytes per physical sector INTERLEAVE Bytes 14 15 The ProDri e has an interleave fac...

Страница 90: ...t READ or WRITE A WIE bit set to one indicates that the ProDrive will treat this segment as if it had been generated by a READ Setting WIE to zero preserves more data in the cache from READs increasin...

Страница 91: ...g The default is zero FDB FAST DEASSERTION OF BUSY Byte 2 Bit 5 Not used nor required by applications using the ProDril e It is included to maintain software compatibility with Quantum s Q200 SeriesTM...

Страница 92: ...2 of byte 3 the value set by the jumpers will be ignored When the SSID bit is set to one the SCSI ID will not be altered until the next RESET or power up of the drive If upon initial power up the SSID...

Страница 93: ...ase a reservation that is not currently active TABLE 5 26 RELEASE Command Bit 7 I 6 I 5 J 4 J 3 J 2 J I 1 0 Byte 0 OPCODE 17H 1 LUN O 13RDPTY I 3RD PARTY DEVICE ID IEXTENT 2 RESERVAnON IDENTIFICAnON 3...

Страница 94: ...et to zero Report Chanaeable Values PCF 01 The page defined by the page code is returned to the initiator with all fields and bits changeable by the initiator set to ones Fields and bits not allowed t...

Страница 95: ...urned to the initiator in the MODE SENSE data This page code is only valid in the MODE SENSE command Spedfying page code 04H in a MODE SELECT command will result in a CHECK CONDmON status with Illegal...

Страница 96: ...zero for the ProDrive indicating that the drive is write enabled BLOCK DESCRIPTOR LENGTH Byte 3 Specifies the length in bytes of all the block descriptors It is set to eight for the ProDrive BLOCK DES...

Страница 97: ...LSB 17 19 RESERVED 0 NOTE The ProDrive 4OS 80S disk drives have 834 cylinders The ProDrive 40S has three heads the ProDrive 80S has six heads The write precompensation starting cylinders reduced writ...

Страница 98: ...equest to start or stop the ProDrive may be repeated without error there will be no effect on the drive if the requested condition is the same as its current condition NOTES A shorting plug labeled WS...

Страница 99: ...be tenninated with a GOOD status otherwise the command will be tenninated with a CHECK CONDmON status with the sense key set to HARDWARE ERROR DEVOFL SCSI DEVICE OFF LINE Byte 1 Bit 1 Not supported I...

Страница 100: ...transfer will be encountered This logical block address will be greater than or equal to the logical block address specified in the command descriptor block The eight bytes of READ CAPACITY data shown...

Страница 101: ...s of data that are to be transferred A transfer length of zero indicates that no logical blocks are to be transferred This condition will not be considered an error Any other value indicates the numbe...

Страница 102: ...WRITE AND VERIFY COMMAND OPCODE 2E hex The WRITE AND VERIFY command Table 5 36 instructs the ProDrive to write the data transferred from the initiator to the medium and verify that the data is writte...

Страница 103: ...SS LSB 6 RESERVED O 7 8 MSB VERIACAnON LENGTH LSB 9 vu o I RESERVED 0 I F I L BYTCHK BYTE CHECK Byte 1 Bit 1 Must be set to zero See the explanation of BYTCHK in the WRITE AND VERIFY command Section 5...

Страница 104: ...s requested the drive will return the defect data in Physical Sector Format In this case the ProDrive will create the CHECK CONDITION status with RECOVERED ERROR sense key after the defect list data l...

Страница 105: ...41 The defect list length specifies the total length in bytes of the defect descriptors that follow The defect list length is equal to eight times the number of defect descriptors Ifthe allocation len...

Страница 106: ...the meaning of the transfer length field depend on the contents of the mode field The mode field is defined as follows Bit2 BiU BitO MODE 0 0 0 Write combined header and data o 0 I Vendor unique 0 1 0...

Страница 107: ...5 11 24 READ BUFFER COMMAND OPCODE 3C hex The READ BUFFER command Table 5 43 is used in conjunction with the WRITE BUFFER command as a diagnostic function for testing ProDrive memory and the SCSI bus...

Страница 108: ...able header and data have been transferred to the initiator whichever occurs first TABLE 5 44 READ BUFFER Header Bit 7 6 5 4 3 2 1 o Byte o RESERVED 1 3 MSB AVAll ABLE LENGTH AVAILABLE LENGTH Bytes 1...

Страница 109: ...CODE EA hex The WRITE command Table 5 19 requests that the data transferred to the ProDrive be written in the area specified by the logical block address The data passed during the WRITE LONG operatio...

Страница 110: ...Section 5 SCSI Programming Guidelines This page intentionally left blank 5 70 SCSI Programming Guidelines...

Страница 111: ...4 1 MAINTENANCE LEVELS EQUIPMENT AND SPARES LEVELS OF MAINTENANCE Corrective maintenance on the drive requires certain minimum levels of technical expertise and facilities Capabilities in this area w...

Страница 112: ...personnel providing Level 1 maintenance on the ProDrive One drive control PCBA Quantum part number 800 00 9304 One shock mount bracket assembly Quantum part number 480 00 0054 A 2 Phillips tip 6 4 2 2...

Страница 113: ...amount of subsequent data has been read into the cache segment During write operations DisCache employs a write through design in which data written to the drive is written immediately to the disk Thi...

Страница 114: ...Ran e 0 1 1 2 4 8 16 0 1 0 1 Default Value 4 o o 0 128 logical blocks 16 0 128 logical blocks I 0 1 Through the use of these programmable parameters the caching feature can be tailored to optimize ind...

Страница 115: ...unt of space in the cache segment so the corresponding prefetch data could essentially occupy the rest of the space within the segment The other factors detennining prefetch size are the maximum and m...

Страница 116: ...Appendix A DisCache This page intentionally left blank A 4 Appendix A DisCache...

Страница 117: ...029 sequentially numbered sectors and the ProDrive 80S contains 164 058 sequentially numbered sectors each capable of storing 512 bytes of data TRACK AND CYLINDER SKEWING Since the ProDrive 40S 80S d...

Страница 118: ...he drive is ready to continue accessing data the sector to be accessed is positioned directly under the read write head Therefore the cylinder skew takes place between the last sector ofdata on the la...

Страница 119: ...reas can be detected and skipped not used for storage DEFECT MANAGEMENT FACTORY FOUND DEFECTS ProDrive disk drives are scanned in the factory for defective sectors on the disks Those defective sectors...

Страница 120: ...ld found or grown defects are also mapped into the one replacement sector located at the end ofeach zone However data from field found defective sectors are mapped directly into the spare sector locat...

Страница 121: ...ons by the host The option desired by the host will be specified via the SCSI Mode Select command See Section 5 11 10 28 35 Option 1 Post Error off Automatic Reallocation om This is a no action option...

Страница 122: ...allowing correction of an 11 bit single burst error In addition a retry correction strategy is used to avoid using ECC on soft errors OPERATION OF ECC If the syndrome is 0 no errors data is passed to...

Страница 123: ...ppendix C Disconnect The function that occurs when a target releases control of the SCSI bus allowing it to go to the BUS FREE phase Disk Platter A very flat circular substrate upon which a magnetic t...

Страница 124: ...3423 RPM for more than 2 sec This area is used to prevent the heads from touching the surface in data areas adding to the data integrity and reliability of Quantum drives The act of driving a signal t...

Страница 125: ...XXH Zero Appendix D Glossary Numbers followed by a capital H subscript or denoted hex are hexadecimal values All other numbers are decimal values A false signal value Appendix D Glossary 0 3...

Страница 126: ...Appendix D Glossary This page intentionally left blank D4 Appendix D Glossary...

Страница 127: ...rranty products returned to Quantum for repair There is one flat rate charge for all repairs requiring work outside the cover and 2 different flat rate for repairs requiring work inside the cover Repa...

Страница 128: ...Appendix E Quantum Repair Procedure This page intentionally left blank E 2 Appendix E Quantum Repair Procedure...

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