○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Elite Disc Drive ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST43401N/ND ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ST43402ND ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Contents Preface ................................................................................................... Electrostatic discharge protection ........................................................... Important safety information and precautions ......................................... Technical support services ..................................................................... Section 1. General maintenance information ......................................... Section 2.
ST43401N/ND and ST43402ND Reference Manual, Rev. C iii Preface This is a reference manual for users of Seagate® ST43401N/ND and ST43402ND Elite™ disc drives employing the SCSI interface. It supplements the information presented in the user’s manual (publication 83327720). It is intended to aid engineers who design subsystems using the drive and customer engineers who install and check out the drive. This manual should be used in conjunction with the user’s manual.
iv ST43401N/ND and ST43402ND Reference Manual, Rev. C Important safety information and precautions Caution. Use forced-air ventilation when bench-testing the drive to ensure proper cooling of drive components. Use proper safety and repair techniques for safe, reliable operation of this unit. Service should be done only by qualified persons. We recommend the procedures in this manual as effective ways of servicing the unit. Some procedures require the use of special tools.
ST43401N/ND and ST43402ND Reference Manual, Rev. C v • Do not remove any circuit boards from the drive chassis. Return the entire drive for depot repair if any circuit board is defective. Removal of circuit boards by personnel not performing depot repair will damage components and may void the warranty. • Do not remove the head and disc assembly (HDA) from the drive chassis. Return the entire drive for depot repair if the HDA is defective. • Do not attempt to disassemble the HDA.
vi ST43401N/ND and ST43402ND Reference Manual, Rev. C Technical support services Seagate Technology provides technical support literature and diagnostic utilities to authorized distributors. Please contact your dealer for technical support and installation troubleshooting. Product technical support is available for all Seagate products by calling the SeaFAX™, SeaFONE™, SeaTDD™, or SeaBOARD™ services. These are toll calls if you dial from outside of the number’s local dialing area.
ST43401N/ND and ST43402ND Reference Manual, Rev.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 1 Section 1. General maintenance information This section contains general information relating to maintenance of the drive. You should be familiar with the information in this section and with drive operation before attempting any maintenance procedures.
2 ST43401N/ND and ST43402ND Reference Manual, Rev. C The following procedure provides an overall check of the DC voltages used by the drive. Before performing this procedure, you should be familiar with the other information in this section and the safety information in the preface. The illustration to the right shows where the individual voltages appear on the drive’s DC power connector (J15). Insert your test probe into the contact openings on the back surface of the 4pin DC cable connector.
ST43401N/ND and ST43402ND Reference Manual, Rev. C Control Board 3 Power Board Optional Bezel Option Jumpers and Spindle Sync Connector Option Jumpers Option Jumpers Option Jumpers Pin 1 I/O Connector Chassis Head and Disc Assembly (HDA) DC Power Connector Figure 1.
4 ST43401N/ND and ST43402ND Reference Manual, Rev. C Power Board Control Board Remote Operator Panel Connector Optional Bezel Spindle Sync Connector Port B I/O Connector I/O Board Power Pin 1 DC Power Connector Chassis Option Jumpers Port B Terminator Power Port A Terminator Power Head and Disc Assembly (HDA) I/O Board Port A I/O Connector Figure 2.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 5 Section 2. Planning the system This section supplements the installation instructions presented in the user’s manual (publication 83327720).
6 ST43401N/ND and ST43402ND Reference Manual, Rev. C M4 x .70 Metric Threads (4) 6-32 Threads (4) Side A C.G. K B D E C F J Bottom I 6-32 Threads (4) G H C.G. L I mm in A B C D E F G H I J K L 3.25 0.86 0.39 1.93 3.120 8.60 5.50 5.75 0.12 3.96 1.58 3.13 ± ± ± ± ± ± ± ± ± ± ± ± 0.01 0.01 0.01 0.01 0.005 0.03 0.01 0.01 0.01 0.05 0.05 0.05 82.55 21.84 9.91 49.02 79.25 218.44 139.70 146.05 3.05 100.58 40.13 79.50 Figure 3.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 7 M4 x .70 Metric Threads (4) 6-32 Threads (4) K Side A C.G. O B D E C F N I J 6-32 Threads (4) L C.G. Bottom P H G M mm in A B C D E F G in mm 3.25 ± 0.01 0.86 ± 0.01 0.39 ± 0.01 1.87 ± 0.02 3.120 ± 0.005 8.00 max 5.50 ± 0.01 82.55 21.84 9.91 47.50 79.24 203.20 139.70 H I J K L M N O P 5.75 0.12 0.06 3.38 5.88 0.19 3.90 1.58 3.13 ± ± ± ± ± ± ± ± ± 0.01 0.01 0.02 0.02 0.01 0.01 0.05 0.05 0.05 146.05 3.05 1.52 85.85 149.35 4.
8 ST43401N/ND and ST43402ND Reference Manual, Rev. C Guidelines for proper air flow Your enclosure design must ensure adequate cooling for the drive. We recommend orienting the drive or directing the air flow in a way that creates the least amount of air-flow resistance while providing air flow above the circuit boards and around the head and disc assembly (HDA). Also, choose the shortest possible path between the air inlet and exit.
ST43401N/ND and ST43402ND Reference Manual, Rev. C Above unit Under unit Note. Air flows in the direction shown (front to back) or in reverse direction (back to front) Above unit Note. Air flows in the direction shown or in reverse direction (side to side) Figure 5.
10 ST43401N/ND and ST43402ND Reference Manual, Rev. C To evaluate the air-flow design, place the drive in its final mechanical position and perform random read and write operations. After the temperatures stabilize, measure the surface (case) temperatures of the components listed in the appropriate table below. The mean time between failures (MTBF) values assume that the drive operates below the specified reliability guidelines. Table 1.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 11 Guidelines for I/O cabling This topic provides recommendations for I/O cabling and lists the parts that can be used in various cables.
12 ST43401N/ND and ST43402ND Reference Manual, Rev. C Drives and initiator in one cabinet Terminator Drive 0 2 x 34 Pin Connector 68 Conductor Flat Cable or Twisted Pair Drive N Terminator Initiator Notes: 1. Cables and terminators shown are unshielded. 2. Flat cable can be used with single-ended drivers. Twisted-pair flat cable must be used with differential drivers. 3. Total length of cables and stubs cannot exceed 25m (82.0 ft) with differential drivers or 3.05m (10.0 ft) with single-ended drivers.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 13 Drives and initiator in separate cabinets Unshielded Terminator Drive 0 2 x 34 Pin Connector Drive 1 Drive 2 Initiator Drive 3 Terminator Bulkhead Flat Cable or Twisted Pair Bulkhead Shielded Connector Shielded Connector Cabinet A Cabinet B Shielded Cable Notes: 1. Initiator in one cabinet (A). 2. All drives in another cabinet (B). 3. Both bulkheads have shielded connectors. 4. Flat cable can be used with single-ended drivers.
14 ST43401N/ND and ST43402ND Reference Manual, Rev. C Drives in separate cabinets Drive 0 Drive 1 Drive 4 Drive 2 Initiator ID 6 Initiator ID 5 Drive 3 Drive 7 Bulkhead Shielded Terminator Cabinet A Bulkhead Shielded Cable Cabinet B Figure 9.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 15 Table 3 lists the parts needed to construct unshielded I/O cables. Table 4 lists part numbers and lengths of synchronized spindle cables. Table 5 provides part numbers of external terminators and resistor-pak terminators. ST43402ND (dual port) drives have both I/O connectors (one for Port A and the other for Port B) located on the I/O board.
16 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 4. Synchronized spindle cables Length 1.5 feet (0.46 meter) 3 feet (0.91 meter) 5 feet (1.52 meter) 7 feet (2.13 meter) 10 feet (3.05 meter) 20 feet (6.09 meter) 30 feet (9.14 meter) 40 feet (12.19 meter) 50 feet (15.24 meter) Seagate part number 70703929 70703921 70703922 70703923 70703924 70703925 70703926 70703927 70703928 Table 5.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 17 Using the sweep cycle function The sweep cycle is a feature that periodically moves the heads to different locations on the discs during intervals when the drive is idle. The following are highlights of the sweep cycle function: • Using the sweep cycle enhances drive reliability. We encourage you either to enable the drive sweep cycle or to use a sweep cycle controlled by the host (initiator). Consult with an analyst in making this choice.
18 ST43401N/ND and ST43402ND Reference Manual, Rev. C Sweep Cycle Option J4B ST43401N/ND Sweep Cycle Option J4B ST43402ND Figure 10.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 19 Section 3. Interface functions This section provides an overview of the small computer system interface (SCSI) as it is used in the Elite drive. It is beyond the scope of this manual to provide a detailed description of all the features, capabilities, variations, and protocol of SCSI-2. This information is provided in the SCSI Interface Specification for the Elite Product Family (document 64721702).
20 ST43401N/ND and ST43402ND Reference Manual, Rev. C Initiator Host Target SCSI Bus Host Adaptor Initiator Host Drive (logical unit) Embedded Controller Target Host Adaptor Drive (logical unit) Embedded Controller To same or other SCSI units. Total must be 16 or less. Each device must have a unique SCSI ID, assigned by its SCSI ID bit.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 21 Data Bus Bits 0-15 (plus parity) Busy (BSY) Select (SEL) Reset (RST) Attention (ATN) Initiator Acknowledge (ACK) Request (REQ) Message (MSG) Input/Output (I/O) Control/Data (C/D) Figure 12.
22 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 6. SCSI bus signal lines Signal Data Bus (DB 15–0+P) Source I–T Function Sixteen data-bit signals, plus a parity bit signal that form the Data Bus. DB(15) is the mostsignificant bit and has the highest priority during the Arbitration phase. Bit number, significance, and priority decrease downward to DB(0). A data bit is defined as 1 when the signal is true and 0 when false. Data parity DB(P) is odd.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 23 I/O signal processing The following paragraphs describe the basic SCSI bus communication process. They describe the bus phases, a typical command sequence, command set, and message codes. The Request Sense command and the Receive Diagnostic Results command provide information to the initiator about drive functions. The coding of this information is explained later in this section.
24 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 8. SCSI bus phase descriptions Phase Bus Free Description No SCSI device asserts Busy or Select for at least one bus settle delay. Arbitration Allows one SCSI device to gain access to the bus based on its priority ID bit. Selection Allows an initiator to select a target. The I/O line must not be asserted in this phase.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 25 SCSI command execution Figure 13 illustrates the basic flow of a command sequence. The sequence illustrated cannot and does not represent all variations. Refer to the SCSI Interface Specification for the Elite Product Family (document 64721702) for command descriptions, execution details, and timing constraints.
26 ST43401N/ND and ST43402ND Reference Manual, Rev. C The selected device responds to the initiator by entering the Message Out phase if the initiator has Attention asserted. In this phase, the target requests that the initiator send messages to it. The Message, Control/ Data, and Input/Output lines are used in combinations to indicate the various information transfer phases.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 27 At this point, the Message In phase is entered with a Disconnect message code. Following the disconnect, the bus is in the Bus Free phase in preparation for the Arbitration and Reselection phases. After Reselection, the process continues with the Message In and Data In phases previously described. The Status phase occurs at the end of the operation. It allows the target to send status information to the initiator.
28 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 9.
ST43401N/ND and ST43402ND Reference Manual, Rev.
30 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 10.
ST43401N/ND and ST43402ND Reference Manual, Rev.
32 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 11.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 33 The Request Sense command The Request Sense command (03H) requests that the target transfer sense data to the initiator. This data is returned in the extended sense format. Within this format are the following three levels of information: • Sense key—defined in Table 12. • Additional Sense Code—see byte 12 listing in Table 13. • Additional Sense Code qualifiers—see byte 13 listing in Table 13.
34 ST43401N/ND and ST43402ND Reference Manual, Rev. C Table 13.
ST43401N/ND and ST43402ND Reference Manual, Rev.
36 ST43401N/ND and ST43402ND Reference Manual, Rev.
ST43401N/ND and ST43402ND Reference Manual, Rev.
38 ST43401N/ND and ST43402ND Reference Manual, Rev. C Field replaceable unit (FRU) code In the event of a failure, the FRU code byte identifies the assembly that may have failed. The codes are listed in probability order with the most probable assembly listed first and the least probable listed last. FRU codes are shown in Table 15. Table 15.
ST43401N/ND and ST43402ND Reference Manual, Rev. C 39 Error code This two-byte value provides information about what part of the diagnostic operation has failed. The error codes are shown in Table 16. Table 16.
Seagate Technology, Inc. 920 Disc Drive, Scotts Valley, CA 95066-4544, USA Publication Number: 83327730, Rev.