Seagate Elite 23 ST423451N Page 1 Product Manual Download

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Elite 23 Disc Drive

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ST423451N/W/WD

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Product Manual, Volume 1

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Summary of Contents for Elite 23 ST423451N

Page 1: ... Elite 23 Disc Drive ST423451N W WD Product Manual Volume 1 ...

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Page 3: ... Elite 23 Disc Drive ST423451N W WD Product Manual Volume 1 ...

Page 4: ...nc Elite SeaFAX SeaFONE SeaNET SeaTDD and SeaBOARD are either trademarks or registered trademarks of Seagate Technology Inc or one of its subsidiaries All other trade marks or registered trademarks are the property of their respective owners No part of this publication may be reproduced in any form without written permission from Seagate Technology Inc Printed in the United States of America ...

Page 5: ... the SCSI interface information in the volume 2 SCSI Interface Product Manual part number 77738479 If you need SCSI interface information order the volume 2 SCSI Interface Product Manual part number 77738479 Revision Date Writer Engineer Sheets Affected A 08 25 97 D Ashby B Rathe All ...

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Page 7: ...te sectors 9 4 2 3 General performance characteristics 9 4 3 Start stop time 11 4 4 Prefetch multi segmented cache control 11 4 5 Cache operation 11 4 5 1 Caching write data 12 4 5 2 Prefetch operation 12 5 0 Reliability specifications 15 5 1 Error rates 15 5 1 1 Environmental interference 15 5 1 2 Read errors 15 5 1 3 Write errors 15 5 1 4 Seek errors 16 5 2 Reliability and service 16 5 2 1 Mean ...

Page 8: ...9 9 2 SCSI interface messages supported 39 9 3 SCSI interface commands supported 40 9 3 1 Inquiry data 43 9 3 2 Mode Sense data 43 9 4 SCSI bus conditions and miscellaneous features supported 47 9 5 Synchronous data transfer 48 9 5 1 Synchronous data transfer periods supported 48 9 5 2 REQ ACK offset 48 9 6 Physical interface 48 9 6 1 DC cable and connector 48 9 6 2 SCSI interface physical descrip...

Page 9: ...ct jumper connectors 33 Figure 9b ST423451 WD model auxillary remote cable ID select 34 Figure 10a J4A connections for Activity Fault and Ready LED indicators for all models 35 Figure 10b J7 auxiliary remote cable connections for Ready and Fault indicators WD model only 35 Figure 11 Suggested air flow 37 Figure 12 Physical interface for N model drives 49 Figure 13 Physical interface for W and WD m...

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Page 11: ...t 20 interface specifications to the extent described in this manual The SCSI Interface Prod uct Manual part number 77738479 describes general SCSI interface characteristics of this and other families of Seagate drives From this point on in this product manual the reference to Elite 23 models is referred to as the drive unless references to individual models are necessary Figure 1 Elite 23 disc dr...

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Page 13: ... assure that the drive meets the appropriate EMI requirements in their system Shielded I O cables may be required if the enclosure does not provide adequate shielding If the I O cables are external to the enclosure shielded cables should be used with the shields grounded both to the enclosure and to the host controller 2 1 1 1 Electromagnetic susceptibility As a component assembly the drive is not...

Page 14: ...cuments Elite 23 Installation Guide Seagate P N 83329130 SCSI Interface Product Manual Volume 2 Seagate P N 77738479 ANSI small computer system interface SCSI document numbers X3 131 1994 SCSI 2 X3T10 855D rev 15a SPI X3T10 1071D rev 6 Fast 20 also called Ultra SCSI Package Test Specification Seagate P N 30190 001 under 100 lb Package Test Specification Seagate P N 30191 001 over 100 lb In case of...

Page 15: ...e and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets logical block addressing is used The head and disc assembly HDA is sealed at the factory Air circulates within the HDA through a non replaceable filter to maintain a contamination free HDA environment Refer to Figure 2 for an exploded view of the drive This exploded view is for ...

Page 16: ... 4 096 bytes per sector Programmable sector reallocation scheme Flawed sector reallocation using sector slipping at format time Programmable auto write and read reallocation Reallocation of defects on command post format Reed Solomon error correction code for header and data fields can correct up to 64 bit error Sealed head and disc assembly HDA No preventative maintenance or adjustment required D...

Page 17: ... reallocation sectors reserved and the number of bytes per sector The following table shows standard OEM model capacities Notes 1 Standard OEM models are formatted to have 512 byte sectors Sector size selectable at format time Users having the necessary equipment may modify the data block size before issuing a format command and obtain different formatted capacities than those listed User availabl...

Page 18: ...e shipping Some of the options available are The capacities shown in Section 3 5 You can order other capacities by selecting other sparing schemes and sector sizes Single unit shipping pack The drive normally ships in bulk packaging to provide maximum protection against transit damage Units shipped individually require additional protection as provided by the single unit ship ping pack Specify thi...

Page 19: ...aneous 2 byte wide transfer rate 10 0 Mbytes sec 7 Synchronous transfer rate for SCSI Fast 20 Ultra SCSI 8 bit data bus models 2 5 to 20 Mbytes sec 16 bit data bus models 5 0 to 40 Mbytes sec All notes for Sections 4 2 are listed at end of Section 4 2 3 ST423451 Drive capacity 29 4 Gbyte unformatted 1 Read write heads 28 Bytes track 152 908 Bytes average unformatted 1 Bytes surface 1 051 Mbytes un...

Page 20: ...tency 5 55 msec Notes for Sections 4 2 1 Execution time is measured from receipt of the last byte of the Command Descriptor Block CDB to the request for a status byte transfer to the initiator excluding connect disconnect 2 Maximum times are specified over the worst case conditions of temperature voltage margins and drive orientation When comparing specified access times take care to distinguish b...

Page 21: ...tes can be used as a cache The cache can be divided into logical segments Mode Select page 08h byte 13 from which data is read and to which data is written The drive keeps track of the logical block addresses of the data stored in each segment of the cache If the cache is enabled see RCD bit 0 in Mode page 08h byte 2 bit 0 in the SCSI Interface Product Manual data requested by the host with a read...

Page 22: ...egments to calculate the segment size The default is three segments 4 5 1 Caching write data When the WCE Write Cache Enable bit is enabled the drive uses a drive buffer storage area where the data to be written to the drive is stored in one or more segments while the drive performs the Write command The write cache uses the same buffer space and segmentation as the read cache The buffer segmentat...

Page 23: ...under the control of ARLA Adaptive Read Look Ahead If the host uses software interleave ARLA enables prefetch of contiguous blocks from the disk when it senses that a prefetch hit will likely occur even if two consecutive read operations were not for physically contiguous blocks of data e g software interleave ARLA disables prefetch when it decides that a prefetch hit will not likely occur If the ...

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Page 25: ...apable of being detected from the error or fault status provided through the drive or SCSI interface or is not capable of being recovered by normal drive or system recovery procedures without operator interven tion 5 1 2 Read errors Before determination or measurement of read error rates The data that is to be used for measurement of read error rates must be verified as being written correctly on ...

Page 26: ...wing expression defines MTBF Estimated power on operating hours in the period MTBF per measurement period Number of drive failures in the period Estimated power on operation hours means power up hours per disc drive times the total number of disc drives in service Each drive accumulates at least nine months of operation Data is calculated on a rolling average base for a minimum period of six month...

Page 27: ...T attribute data will be saved to the disc for the purpose of recreating the events that caused a predic tive failure The drive will measure and save parameters once every two hours subject to an idle period on the SCSI bus The process of measuring off line attribute data and saving data to the disc is uninterruptable and the maximum delay is summarized below Maximum processing delay On line only ...

Page 28: ...cifications will be repaired or replaced at Seagate s option and at no charge to customer if returned by customer at cus tomer s expense to Seagate s designated facility in accordance with Seagate s Warranty Procedure Seagate will pay for transporting the repair or replacement item to customer For more detailed warranty information refer to the Standard Terms and Conditions of Purchase for Seagate...

Page 29: ...and the drive has not yet received a Start Motor command 5 See Section 6 2 1 Conducted Noise Immunity Specified voltage tolerance is inclusive of ripple noise and transient response 6 At power up the motor current regulator limits the 12 volt current to an average value of less than the value given here although instantaneous peaks may exceed this value These peaks should measure 5 msec duration o...

Page 30: ...ts against inadvertent writing during power up and down Daisy chain operation requires that power be maintained on the terminated device to ensure proper termination of the peripheral I O cables To automatically delay motor start based on the target ID SCSI ID enable the Spinup Delay option install jumper and disable the Start Command option remove jumper on the J4B connector See Section 8 1 for p...

Page 31: ...t the drives ability to meet specifications The MTBF specification for the drive is based on operating at an ambient temperature of 86 F 30 C Occasional excursions to drive ambient temperatures of 122 F 50 C or 41 F 5 C may occur without impact to specified MTBF To achieve the specified MTBF the enclosure for the drive should be designed such that the temperature values of Table 3 column 2 are not...

Page 32: ...oling air may be required to ensure that these values are not exceeded 3 Measure HDA temperature at point labeled HDA Temp Checkpoint on Figure 4 4 PCB mounted integrated circuit case Figure 4 Location of PCB components listed in Table 3 Component Figure 4 reference Column 1 Maximum case 4 temperature C operating 50 C ambient 2 Column 2 Typical case 4 temperature C at 35 C ambient 1 ADC 1 131 F 55...

Page 33: ...ith the restrictions of Section 8 4 Orientation of the side nearest the LED may be up or down 6 4 4 1 Shock a Operating normal The drive as installed for normal operation will operate error free while subjected to intermittent shock not exceeding 2 0 g at a maximum duration of 11 msec half sinewave Shock may be applied in the X Y or Z axis b Operating abnormal Equipment as installed for normal ope...

Page 34: ...Size Packaged Product Weight Drop Height 600 cu in 9 800 cu cm Any 60 in 1 524 mm 600 1 800 cu in 9 800 19 700 cu cm 0 20 lb 0 9 1 kg 48 in 1 219 mm 1 800 cu in 19 700 cu cm 0 20 lb 0 9 1 kg 42 in 1 067 mm 600 cu in 9 800 cu cm 20 40 lb 9 1 18 1 kg 36 in 914 mm Z Y X Z Y X ...

Page 35: ... This includes both isolated drives and integrated drives The drive does not incur physical damage or degraded performance as a result of continuous vibration not exceeding 5 22 Hz 0 040 inches 1 02 mm displacement 22 400 Hz 1 00 g Vibration may be applied in the X Y or Z axis 6 4 5 Air cleanliness The drive is designed to operate in a typical office environment with minimal environmental control ...

Page 36: ...54 93 79 25 21 84 139 70 2 17 79 24 74 93 82 52 A B C D E F G H J K L 0 010 0 010 0 010 0 020 0 010 0 005 0 010 0 010 0 010 0 020 0 020 25 25 25 50 25 13 25 25 25 50 50 Mounting holes two on each side 6 32 UNC Max screw length into side of drive 0 17 in 4 318 mm Mounting holes four on bottom 6 32 UNC Max screw length into bottom of drive 0 18 in 4 572 mm Power and interface connections Decorative ...

Page 37: ... 02 54 93 79 25 21 84 139 70 2 17 79 24 74 93 82 52 A B C D E F G H J K L 0 010 0 010 0 010 0 020 0 010 0 005 0 010 0 010 0 010 0 020 0 020 25 25 25 50 25 13 25 25 25 50 50 Mounting holes two on each side 6 32 UNC Max screw length into side of drive 0 17 in 4 318 mm Mounting holes four on bottom 6 32 UNC Max screw length into bottom of drive 0 18 in 4 572 mm Power and interface connections Decorat...

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Page 39: ...of several SCSI commands the details of which are described in the SCSI Interface Product Manual The drive implements selectable error recovery time limits such as are required in video applications For addi tional information on this refer to Table 5 2 1 22 in the SCSI Interface Product Manual which describes the Mode Select Mode Sense Error Recovery parameters The error recovery scheme supported...

Page 40: ... of 456 msec recovery time for all four blocks If either of these limits is reached and a block has not yet been recovered the command will end with CHECK CONDITION status and an unrecoverable read error will be reported Table 4 Read and write retry count maximum recovery times Read retry count 1 Maximum recovery time per LBA cumulative msec Write retry count 1 Maximum recovery time per LBA cumula...

Page 41: ...rovided by the user systems integrator or host equipment manufacturer If the drive is attached to a bus that contains other devices and the new drive is not attached to the end of the bus the Terminator Enable jumper TE should be removed from the new drive Note For additional information about terminator requirements refer to Sections 9 8 and 9 9 Set all appropriate option jumpers for desired oper...

Page 42: ...ommand Option ME Check the parity of data bytes read from the SCSI Bus Ignore parity check SCSI Bus Parity Check PD Reserved J01 J4B J4A Pin 1 Pin 1 SCSI ID 0 default J4A SCSI ID 1 SCSI ID 2 SCSI ID 3 SCSI ID 4 SCSI ID 5 SCSI ID 6 SCSI ID 7 Pin 1 Pin 1 J01 J4B Pin 1 J4A Terminator Enabled TE Terminator Disabled TE Write Protect Disabled WP Reserved Terminator Power Option TP Internal terminator po...

Page 43: ...n 1 Pin 1 J4A J7 Immediate spinup if the Start Command option jumper is disconnected Spinup delay equal to the SCSI Bus ID multiplied by 12 seconds if the Start Command option jumper is disconnected Spinup Delay Option DS J4B Start spindle according to the Spinup Delay option jumper Start spindle after the SCSI Bus sends a Start Unit command Start Command Option ME Check the parity of data bytes r...

Page 44: ... select SCSI ID 0 default J7 SCSI ID 1 SCSI ID 2 SCSI ID 3 SCSI ID 4 SCSI ID 5 SCSI ID 6 SCSI ID 7 SCSI ID 8 SCSI ID 9 SCSI ID Ah 10 SCSI ID Bh 11 SCSI ID Ch 12 SCSI ID Dh 13 SCSI ID Eh 14 SCSI ID Fh 15 A3 A2 A1 A0 J01 J6 SCSI I O Connector DC Power Connector J4B Pin 1 Pin 1 J4A J7 Pin 1 ...

Page 45: ...onnector Fault Ready LED Connector Terminator Enabled TE Active Fault Ready Reserved Note On some LEDs the flat side of indicator is cathode Pin 1 Pin 16 Pin 15 Pin 17 Pin 18 CATH CATH CATH J01 J4B J4A J6 SCSI I O Connector DC Power Connector Pin 1 Pin 1 Ready LED Connector J7 Fault LED Connector J01 J4B Pin 1 Pin 2 GND J4A J7 Pin 1 Fault Ready Note On some LEDs the flat side of indicator is catho...

Page 46: ...ult is Drive ID 0 ID 7 is highest priority which is usually the SCSI host adapter Priorities go ID7 to ID0 then ID15 to ID8 Pins 4 6 8 10 and 12 are ground READY LED Pins 1 4 See Figure 10b FAULT LED Pins 2 4 See Figure 10b J4B Jumpers DS ME Applies to all models Off Off Spindle starts immediately after power up Default Off On Spindle does not start until a Start Unit command is received from the ...

Page 47: ... should be oriented or air flow directed so that the least amount of air flow resistance is created while providing air flow to the electronics and HDA Also the shortest possible path between the air inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources within the rack cabinet or drawer environment Possible air flow patterns are shown in Fi...

Page 48: ...s mounted is connected directly to the HDA and PCB with no electri cally isolating shock mounts If you do not want the system chassis to be connected to the HDA PCB ground you must provide a nonconductive electrically isolating method of mounting the drive in the host equipment Increased radiated emissions may result if you do not provide the maximum surface area ground connection between system g...

Page 49: ... Product Manual part number 77738479 2 Not applicable to N models Table 5 SCSI messages supported by Elite 23 family drives Message Name Message Code Supported by SCSI 2 Abort 06h Y Abort tag 0Dh Y Bus device reset 0Ch Y Clear queue 0Eh Y Command complete 00h Y Continue I O process 12h Y Disconnect 04h Y Extended messages 01h 1 Y Identify 80h FFh Y Ignore wide residue two bytes 23h N Initiate reco...

Page 50: ...s from index Y Physical sector format Y DPRY bit supported Y DCRT bit supported Y STPF bit supported Y IP bit supported Y DSP bit supported Y IMMED bit supported Y VS N Inquiry 12h Y Date code page C1h Y Device behavior page C3h Y Firmware numbers page C0h Y Implemented operating definitions page 81h Y Jumper settings page C2h Y Supported vital product data pages 0h Y Unit serial number page 80h Y...

Page 51: ...fetch 34h N Read 08h Y Read buffer modes 0 2 3 supported 3Ch Y Read capacity 25h Y Read defect data 37h Y Read extended 28h Y DPO bit supported Y FUA bit supported Y Read long 3Eh Y Reassign blocks 07h Y Rebuild 81h N Receive diagnostic results 1Ch Y Supported diagnostics pages 00h Y Translate page 40h Y Regenerate 82h N Release 17h Y Release 10 57h Y Request sense 03h Y Actual retry count bytes Y...

Page 52: ...ics page 1Dh Y Supported diagnostics pages Y Translate page Y Set limits 33h N Start unit stop unit start stop spindle 1Bh Y Synchronize cache 35h Y Test unit ready 00h Y Verify 2Fh Y DPO bit supported Y BYTCHK bit supported Y Write 0Ah Y Write and verify 2Eh Y DPO bit supported Y BYTCHK bit supported Y Write buffer modes 0 2 supported 3Bh Y Firmware download option modes 5 7 supported 4 Y Write e...

Page 53: ...ry data shown in Table 7 the initiator can request several Vital Product Data pages by setting the Inquiry command EVPD bit to one The SCSI Interface Product Manual part number 77738479 section 5 1 1 3 1 lists the Vital Product Data pages supported and describes their formats A sepa rate Inquiry command must be sent to the drive for each Vital Product Data page the initiator wants the drive to sen...

Page 54: ...ros In byte 02 hex value EF equates to the binary pattern 1110 1111 If there were a zero in any bit position in the field it means that bit is not change able Bits 7 6 5 3 2 1 and 0 are changeable because those bits are all ones Bit 4 is not changeable In this particular example it indicates 7 of 8 error recovery control bits are changeable FF in column 4 indicates all bits in byte 3 are changeabl...

Page 55: ... 00 00 SAV 03 83 16 00 A8 00 52 00 00 00 00 00 EB 02 00 00 01 00 14 00 41 40 00 00 00 DEF 03 83 16 00 A8 00 52 00 00 00 00 02 EB 02 00 00 01 00 14 00 41 40 00 00 00 CHG 03 83 16 FF 00 FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 SAV 04 84 16 00 1A DC 1C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 18 00 00 DEF 04 84 16 00 1A DC 1C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 18 00 0...

Page 56: ... DEF 1A 9A 0A 00 00 00 00 00 01 00 00 00 04 CHG 1A 9A 0A 00 03 00 00 00 00 00 00 00 00 SAV 1C 9C 0A 00 04 00 00 00 00 00 00 00 01 DEF 1C 9C 0A 00 04 00 00 00 00 00 00 00 01 CHG 1C 9C 0A 8C 0F 00 00 00 00 00 00 00 00 SAV 00 80 02 00 00 DEF 00 80 02 00 00 CHG 00 80 02 77 02 Read Capacity Data 02 B3 91 93 00 00 02 00 Bytes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ...

Page 57: ...g Y Differential interface circuits available Y Disconnect reconnect Y Flag and link bits in control byte supported Y Format progress indication Y Immediate status on format unit command Y Immediate status on start stop command Y Immediate status on synchronize cache command Y Parameter rounding controlled by the round bit in the Mode Select Page 0 Y Queue tagging up to 64 queue tags supported Y R...

Page 58: ...shown Details of the physical electrical and logical characteristics are given in sections following while the SCSI operational aspects of Seagate drive interfaces are provided in the SCSI Interface Product Manual part num ber 77738479 This section describes the connectors cables signals terminators and bus timing of the DC and SCSI I O interface See Sections 9 8 and 9 9 for additional terminator ...

Page 59: ... Figure 13 Physical interface for W and WD model drives Pin 1 J6 SCSI I O Connector Pin 1 DC Power Connector J6 1 2 3 4 Pin 1 2 3 4 Power 12V 12V ret 5V ret 5V Pin 1 J6 SCSI I O Connector Pin 1 DC Power Connector J15 DC Power Pin 1 2 3 4 Power 12V 12V ret 5V ret 5V J6 Pin 1 4 3 2 1 ...

Page 60: ...effect of impedance mismatch must be carefully considered Proper impedance matching is especially important to maintain adequate margin at FAST and FAST 20 Ultra SCSI transfer rates N models use non shielded cable connectors Use a 50 conductor flat cable or 25 twisted pair cable Use a minimum conductor size of 28 AWG to minimize noise effects Suggested non shielded flat cable part numbers are Flat...

Page 61: ...follow ing 9 6 4 1 Mating connectors for ST423451N model Use a non shielded 50 conductor cable connector consisting of two rows of 25 female contacts with adjacent centers 100 inch apart Recommended mating flat cable connector part numbers are 1 See Figure 14 The drive device connector is a non shielded 50 conductor connector consisting of two rows of 25 male pins with adjacent pins 100 inch apart...

Page 62: ...uding host adapter initia tor The number of devices allowed depends on data transfer rate See Table 11 5 SCSI ID7 has highest arbitration priority ID0 has lowest for N models For W models priority is ID 7 to ID 0 then ID 15 to ID 8 ID 8 very lowest 6 Last drive on daisy chain 7 Open end type 68 pin connector used Terminators disabled If end device external terminator and closed end type 68 pin con...

Page 63: ...CSI device connector 100 2 54 2 400 010 60 96 0 25 Typ 2 720 010 69 09 0 25 3 700 93 98 3 782 010 96 05 0 25 840 010 21 34 0 25 160 4 06 100 2 54 025 0 64 Sq Contact 50 Places 326 8 28 4X Ø 0825 001 Ø 2 096 0 025 256 6 5 Typ 200 5 08 Typ 600 15 24 420 10 67 350 010 8 89 0 25 Pin 1 Position 1 2X 050 2X R 125 2 060 197 ...

Page 64: ...nnector contact number 6 Cable conductor number 5 Connector contact number 6 Signal name 1 GND 1 1 2 2 DB0 GND 3 3 4 4 DB1 GND 5 5 6 6 DB2 GND 7 7 8 8 DB3 GND 9 9 10 10 DB4 GND 11 11 12 12 DB5 GND 13 13 14 14 DB6 GND 15 15 16 16 DB7 GND 17 17 18 18 DBP GND 19 19 20 20 GND GND 21 21 22 22 GND GND 23 23 24 24 GND NC 4 25 25 26 26 TERMPWR GND 27 27 28 28 GND GND 29 29 30 30 GND GND 31 31 32 32 ATN GN...

Page 65: ...B1 GND 8 15 16 42 DB2 GND 9 17 18 43 DB3 GND 10 19 20 44 DB4 GND 11 21 22 45 DB5 GND 12 23 24 46 DB6 GND 13 25 26 47 DB7 GND 14 27 28 48 DBP GND 15 29 30 49 GND GND 16 31 32 50 GND TERMPWR 17 33 34 51 TERMPWR TERMPWR 18 35 36 52 TERMPWR RESERVED 19 37 38 53 RESERVED GND 20 39 40 54 GND GND 21 41 42 55 ATN GND 22 43 44 56 GND GND 23 45 46 57 BSY GND 24 47 48 58 ACK GND 25 49 50 59 RST GND 26 51 52 ...

Page 66: ... DB15 4 7 8 38 DB15 DBP1 5 9 10 39 DBP1 GND 6 11 12 40 GND DB0 7 13 14 41 DB0 DB1 8 15 16 42 DB1 DB2 9 17 18 43 DB2 DB3 10 19 20 44 DB3 DB4 11 21 22 45 DB4 DB5 12 23 24 46 DB5 DB6 13 25 26 47 DB6 DB7 14 27 28 48 DB7 DBP 15 29 30 49 DBP DIFFSENS 16 31 32 50 GND TermPwr 17 33 34 51 TermPwr TermPwr 18 35 36 52 TermPwr Reserved 19 37 38 53 Reserved ATN 20 39 40 54 ATN GND 21 41 42 55 GND BSY 22 43 44 ...

Page 67: ...ne flat ribbon cable Other cable types may be used to implement equivalent contact assignments 6 Connector contacts are on 0 100 inch 2 54 mm centers 7 8 bit devices which are connected to the 16 data bit differential I O shall leave the following signals open DB12 DB13 DB14 DB15 DBP1 DB8 DB9 DB10 DB11 DB12 DB13 DB14 DB15 DBP1 DB8 DB9 DB10 DB11 8 bit devices which are connected to the 16 data bit ...

Page 68: ...igure 17 Transmitter characteristics Single ended drives use an ANSI SCSI compatible open collector single ended driver This driver is capable of sinking a current of 48 mA with a low level output voltage of 0 4 volt Receiver characteristics Single ended drives use an ANSI SCSI single ended receiver with hysteresis gate or equivalent as a line receiver Figure 17 Single ended transmitters and recei...

Page 69: ...t the disc drive s SCSI connector Low level output voltage 2 0 V maximum at low level output current 55 milliamps High level output voltage 3 0 V minimum at high level output current 55 milliamps Differential voltage 1 0 V minimum with common mode voltage ranges from 7 V DC to 12 V DC Measure these voltages between the output terminal and the SCSI device s logic ground reference The output charact...

Page 70: ...ystems designer As a help drive 5 V power is made available on SCSI bus N W and WD models for powering external terminators if the drive option select header jumper TP Figures 8 and 9a is installed in rightmost position TP See pin assignment Table 14 for pins assigned to terminator power 6 SCSI I O line pin 21 disables I O circuits if single ended cable plugged in or cable plugged in upside down 7...

Page 71: ...t provide external termination when termination is required Terminator plugs that fit between the cable connector and the drive connector can be purchased See Figure 14 9 9 Terminator power ST423451N and ST423451W drives You can configure terminator power in four different ways See Section 8 1 for illustrations that show how to place jumpers enabling each of the following terminator power configur...

Page 72: ...SG in T14 4 5 7 1 34 µs Reselect identify MSG to status T15 4 5 8 Command dependent Command dependent Reselect identify MSG to data media T16 4 5 11 Command dependent Command dependent Data to status T17 4 5 15 Command dependent Command dependent Status to command complete MSG T18 4 5 5 8 15 1 0 µs Command complete MSG to bus free T19 4 5 5 8 15 0 75 µs Data to save data pointer MSG T20 4 5 14 4 5...

Page 73: ...0 1 0 4 5 4 0 12 µs 0 12 µs Data in byte transfer parameter T24 4 5 12 0 04 µs Data out byte transfer parameter T25 4 5 13 0 04 µs Next data in byte access parameter T26 4 5 12 0 10 µs 0 12 µs Next data byte out access parameter T27 4 5 13 0 10 µs 0 12 µs Data in byte transfer media 2 T28 4 5 12 0 03 µs 0 04 µs Data out byte transfer media 2 T29 4 5 13 0 03 µs 0 04 µs Next data in byte access medi...

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Page 75: ...e com You can also send E mail with your questions to DiscSupport Seagate com or TapeSupport Seagate com Seagate CompuServe forum Online technical support for Seagate products is available on CompuServe To access our technical support forum type go seagate This forum provides information similar to that found on SeaBOARD In addition you can type questions or browse through previous questions and a...

Page 76: ... 488 7528 Taiwan 886 2 715 2923 USA 408 944 9120 Location Phone number Australia 61 2 9725 3366 9 00 A M to 5 00 P M M F England 44 1628 894083 10 00 A M to 1 00 P M 2 00 P M to 5 00 P M M F France 33 1 41 86 10 86 9 30 A M to 12 30 P M 2 00 P M to 5 00 P M M F Germany Disc 49 89 140 9332 Tape 49 89 140 9333 9 30 A M to 12 30 P M 2 00 P M to 4 00 P M M F Hong Kong 852 2368 9918 Korea 82 2 556 8241...

Page 77: ...rt numbers 51 cable requirements 50 cabling 52 cache buffer 7 cache control prefetch multi segmented 11 cache operation 11 cache statistics page 40 caching parameters page 41 caching write data 12 capacities 7 unformatted 9 CDB 12 CE Marking 3 certifications 3 change definition command 40 changeable values 44 characteristics 9 check condition status 47 circuit type 5 clear queue SCSI message 39 co...

Page 78: ...nded 58 DS bit 40 DSP bit 40 DU bit 40 E EFT defect list 29 electrical description 58 electrical specifications 19 electromagnetic interference EMI 15 electromagnetic susceptibility 25 EMC compliance 3 emissions 38 environmental interference 15 environmental limits 21 environmental requirements 15 error management 29 error rates 15 error recovery 29 error recovery page 41 error recovery process 16...

Page 79: ...31 36 jumper connectors 31 ST19171N 32 ST19171W WD 33 jumper function description 36 jumper header 36 jumper plug 31 jumper settings page 40 jumpers function description 36 L linked command complete SCSI message 39 linked command complete with flag SCSI message 39 lock unlock cache command 40 log select command 40 log sense command 40 logical block address 11 logical segments 11 low level format 3...

Page 80: ... queue background processing 7 queue full status 47 queue tag messages SCSI message 39 queue tagging 47 R radiated emissions 38 random data 15 RCD bit 11 read buffer command 41 read capacity command 41 read command 41 read defect data command 41 read error counter page 40 read error rates 15 read errors 15 read extended command 41 read long command 41 read look ahead 13 read retry count 29 read wr...

Page 81: ... command 47 spare reallocation sectors 7 specifications electrical 19 mechanical 25 physical 19 reliability 15 speed 9 spindle 7 spindle brake 7 Standard Inquiry data 43 standards 3 start and stop commands 7 start unit stop unit command 42 start stop time 11 status supported 47 STIR algorithm 7 STPF bit 40 support services 65 supported diagnostics pages 41 42 synchronize cache command 42 synchroni...

Page 82: ...write buffer command 42 write cache enable 12 write command 42 write error counter page 40 write errors 15 write extended command 42 write long command 42 write retry count 29 write same command 42 X XD read 42 XD write 42 XD write extended 42 Xor control page 41 XP write 42 Z zero latency read 47 zone bit recording 6 ...

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Page 84: ...Seagate Technology Inc 920 Disc Drive Scotts Valley California 95066 4544 USA Publication Number 83329140 Preliminary Rev A Printed in USA ...

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