S T 1 4 8 1 N D SEAGATE NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 1476| | | Capacity form/unform 426/ 492 MB Heads 9| | | Seek time / track 14.0/ 2.5 ms Sector/track | | | Controller SCSI2 DIFFERENTIAL Precompensation Cache/Buffer 256 KB LOOK-AHEAD Landing Zone Data transfer rate 3.125 MB/S int Bytes/Sector 512 10.000 MB/S ext SYNC Recording method RLL 1/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 5 50 | -40 70 Power: sleep W Humidity % 8 80 | 5 95 standby W Altitude km -0.305 3.048| -0.305 12.210 idle 13.7 W Shock g 10 | 50 seek W Rotation RPM 4412 read/write W Acoustic dBA spin-up W ECC Bit 64 MTBF h 150000 Warranty Month 12 Lift/Lock/Park YES Certificates CSA,SDA,FCC,IEC950,UL1950,VDE ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST1481/1581-N/ND PRODUCT MANUAL 77738471-A +---------------------------------------------------------+ |-+-+ J5++++++ |XX Power |-| |J7 +----+ |XX |-+-+ | | |XX SCSI | ++ |XX I/O | || |XX | I/O || |XX | Terminators ++ |XX | ++ |XX | || |XX | || |XX | ++ |XX | ++ |XX | || |XX | || |XX | +-----+J6 ++ |XX | +++++++ |XX +---------------------------------------------------------+ Differential I/O PWA is 0.500 in (13mm) longer, bus components of interest here are in the same locations. ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST1481/1581-N/ND PRODUCT MANUAL 77738471-A Jumper setting ============== J6 Motor Start/Write Protect/Terminator Power ---------------------------------------------- +----------------------+-----------------------+ | | 1 2 3 4 5 6 7 8| +----------------------+-----------------------+ |Enable Motor Start | o X o o o o o o| | | o X o o o o o o| +----------------------+-----------------------+ |Delay Motor Start | o o x o o o o o| | | o o X o o o o o| +----------------------+-----------------------+ |Write Protect | o o o x o o o o| | | o o o X o o o o| +----------------------+-----------------------+ |Parity Option | o o o o x o o o| | | o o o o X o o o| +----------------------+-----------------------+ |Terminator Power to | o o o o o o x o| |SCSI Bus | o o o o o o X o| +----------------------+-----------------------+ |Terminator Power from | o o o o o o o x| |Drive | o o o o o o o X| +----------------------+-----------------------+ |Terminator Power from | o o o o o o xxxx| |SCSI Bus | o o o o o o o o| +----------------------+-----------------------+ J6 1 For Factory use only 2 CLOSED Enables Motor Start option. The drive waits for the Start unit command from the host before starting spindle motor. OPEN Drive operation depends on whether or not there is a jumper in position 3. 3 CLOSED Enables the Delayed Motor Start option (if jumper in position 3 is off). Motor start delay is 16 times the drive ID number in seconds; i.e., drive ID 0 immediately, drive one starts 16 seconds later etc. 4 CLOSED Entire drive is write protected. 5 CLOSED Parity error reporting by the drive is enabled. 6 Reserved for later use. 7,8 Select terminator power source. In position 7 drive supplies power to the SCSI bus, pin 26. In position 8 the drive supplies power only to its own terminators (factory setting). Jumper horizontally, upper part (not closed to PWA), between positions 7 and 8 means drive takes power from the SCSI bus, pin 26. Jumpers in both 7 and 8 at the same time is allowed. J5 SCSI ID ----------- +------------+-A2-A1-A0-+ | | 1 2 3 | +------------+----------+ |SCSI ID = 0 | o o o | | | o o o | +------------+----------+ |SCSI ID = 1 | o o x | | | o o X | +------------+----------+ |SCSI ID = 2 | o x o | | | o X o | +------------+----------+ |SCSI ID = 3 | o x x | | | o X X | +------------+----------+ |SCSI ID = 4 | x o o | | | X o o | +------------+----------+ |SCSI ID = 5 | x o x | | | X o X | +------------+----------+ |SCSI ID = 6 | x x o | | | X X o | +------------+----------+ |SCSI ID = 7 | x x x | | | X X X | +------------+----------+ J7 SCSI ID ----------- +------------+-A2-A1-A0------+ | | 1 2 3 4 5 | +------------+---------------+ |SCSI ID = 0 | o o o o o | | | o o o o o | +------------+---------------+ |SCSI ID = 1 | o o x o o | | | o o X o o | +------------+---------------+ |SCSI ID = 2 | o x o o o | | | o X o o o | +------------+---------------+ |SCSI ID = 3 | o x x o o | | | o X X o o | +------------+---------------+ |SCSI ID = 4 | x o o o o | | | X o o o o | +------------+---------------+ |SCSI ID = 5 | x o x o o | | | X o X o o | +------------+---------------+ |SCSI ID = 6 | x x o o o | | | X X o o o | +------------+---------------+ |SCSI ID = 7 | x x x o o | | | X X X o o | +------------+---------------+ |Sync Spindle| o o o x o | | | o o o X o | +------------+---------------+ |Remote LED | o o o o x | | | o o o o X | +------------+---------------+ Either J5 or J7 (optional) may be used to select drive ID. Both should not be used at the same time, because at some future time when the ID is changed the user could fail to configure both J5 and J7 the same. The drive ID is binary coded positionwise (A2, A1, A0) (least significant position on the right), i.e. jumper in position A0 is drive ID 1 etc. J7 Sync Spindle ---------------- 4 Used as a cable connection for the reference index signal (REFSIG+) for sync spindle feature. J7 pin 7 is REFSIG+, pin 8 is GND. When no cable is connected, a jumper must be installed. OEM standard drives are shipped with jumper installed. The Synchronized Spindle Interface (SSI) allows several drives operationg from the same host to operate their spindles at a synchronized rotational rate. J7 Remote LED -------------- 5 Used if needed for a connection to a remote located LED indicator Pin 10 top (away from PWA), the anode connection, connects in the drive to the +5V supply through a pull-up resistor. Pin 9 (bottom), the cathode connection connects in the drive to signal common through the emitter-collector jumction of a transistor switch that controls the LED on/off condition. 50-Pin Single-ended cable Pin Assignments ----------------------------------------- Signal Pin No. Signal Pin No. ---------------------------------------- -DB(0) 2 Ground 28 -DB(1) 4 Ground 30 -DB(2) 6 -ATN 32 -DB(3) 8 Ground 34 -DB(4) 10 -BSY 36 -DB(5) 12 -ACK 38 -DB(6) 14 -RST 40 -DB(7) 16 -MSG 42 -DB(P) 18 -SEL 44 Ground 20 -C/D 46 Ground 22 -REQ 48 Ground 24 -I/O 50 TERMPWR 26 Note: All odd pins, except pin-25 are connected to ground. Pin-25 is left open. Pin 25 must not be connected to ground at the HOST end or the drive end of the cable. If the I/O connector should accidentally be plugged in upside down, terminator power on Pin 26 will be shorted to ground. The minus sign next to the signals indicates asserted state is the low voltage of the two levels used for logic signals. 50-Pin Differential cable Pin Assignments ----------------------------------------- +Signal Pin No. Pin No. -Signal Name Name ------------------------------------------ SHIELD GND 1 2 GROUND +DB(0) 3 4 -DB(0) +DB(1) 5 6 -DB(1) +DB(2) 7 8 -DB(2) +DB(3) 9 10 -DB(3) +DB(4) 11 12 -DB(4) +DB(5) 13 14 -DB(5) +DB(6) 15 16 -DB(6) +DB(7) 17 18 -DB(7) +DB(P) 19 20 -DB(P) DIFFSENS 21 22 GROUND GROUND 23 24 GROUND TERMPWR 25 26 TERMPWR GROUND 27 28 GROUND +ATN 29 30 -ATN GROUND 31 32 GROUND +BSY 33 34 -BSY +ACK 35 36 -ACK +RST 37 38 -RST +MSG 39 40 -MSG +SEL 41 42 -SEL +C/D 43 44 -C/D +REQ 45 46 -REQ +I/O 47 48 -I/O +GROUND 49 50 GROUND J3 DC Power and pin connector assignments ------------------------------------------- +------------+ 1 = + 12 VDC | 1 2 3 4 | 2 = + 12 Volts return +------------+ 3 = + 5 Volts return 4 = + 5 VDC ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST1481/1581-N/ND PRODUCT MANUAL 77738471-A Notes on installation ===================== Drive Orientation ----------------- The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization however, has been done with the drive in horizontal (disc level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations. The drive is designed, manufactured, and tested with a "Plug-in and Play" installation philosophy. This philosophy minimizes the requirements for highly trained personnel to integrate the drive into an OEM's system, wether in a factory or field environment. - Insure that the SCSI ID is not the same as the host adapter. Most host adapters use SCSI ID 7. - If multiple devices are on the bus insure that the SCSI ID of the drive is not already used by other devices on the bus. - If the drive is the only device on the bus it should be attached to end of the SCSI bus cable, and terminators should be installed (provided external terminators are not used). - If the drive is attached to a bus already containing other devices, and the drive is not attached to the end of the bus, the terminators should be removed. - Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after power has been applied the drive must be power cycled for the new settings to be affect. - In all cases additional drives or software will be necessary to logically install the drive onto the system. Mounting Holes -------------- Four 6-32 UNC-2A screws are required for installation. Maximum mounting screw length into chassis is 0.125 inches (3.17 mm) and 0.20 (5.1 mm) into bottom holes. Cooling ------- Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not exceed temperature conditions. Specific consideration should be given to make sure adequate air circulation is present around the components on the PWA. Service Tools ------------- No special tools are required for site installation or recommended for site maintenance. The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not practical since there are no user purchasable parts in the drive. Air Cleanliness --------------- The drive is designed to operate in a typical office environment with minimal environment control. Physical Description -------------------- Model ST1481N/ND and ST1581N/ND disc drives may be chained together or with other compatible SCSI devices using a common cable. The Model ST1481N and ST1581N implement an interface having single ended drivers and receivers. The Model ST1481ND and DT1581ND implement an interface having differential drivers and receivers. Devices having single ended interface circuits cannot be on the same daisy chain with devices having differential interface circuits. A maximum of 8 SCSI devices (including the Host) may be daisy chained together. The SCSI Devices at both ends of the daisy chain are to be terminated. Intermediate SCSI devices shall not be terminated. Remove the terminator resistor packs, not the terminator power source selector jumper. Single Ended I/O Circuits ------------------------- The maximum total cable length for use with drives having single endeded I/O driver and receiver circuits shall be 6 metres (19.7 ft.) when operating at line data transfer rates greater than 5 Mbytes/sec (Fast SCSI). A stub length of no more than 0.1 metre (0.33 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 132 ohms. Differential I/O Circuits ------------------------- The maximum total cable length for use with drives having differential I/O drivers and receiver circuits shall be 25 metres (82 ft.). A stub length of no more than 0.2 metre (0.66 ft.) is allowed off the mainline interconnection with any connected equipment. An ideal impedance match with cable terminators implies a cable characteristic impedance of 122 ohms. General Cable Characteristics ----------------------------- In general, the cables having the characteristics impedances given in Differential I/O Circuits and Single Ended I/O circuits are not available; however, impedances that are somewhat lower are satis- factory. A characteristic impedance of 100 ohm + 10% is recommended for unshielded flat or twisted pair ribbon cable. However, most available cables have somewhat lower characteristic impedance. To minimize discontiuties and signal reflections, cables of different impedances should not be used in the same bus. Implementations may require tradeoffs in shielding effectivness, cable lenght, the number of loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at Fast SCSI transfer rates. Only nonshielded cable connectors are applicable. A 50 conductor flat cable or 25 twisted pair cable shall be used. A minimum conductor size of 28 AWG should be used to minimize noise effects. Suggested nonshielded flat cable part numbers are: Flat cable - 35M-3365-50 Twisted pair - Spectra Twist in flat 455-248-50 Equivalent parts may be used. +--------------SCSI-DEVICE-----------------+ | +--+ HOST ADAPTER/INITIATOR *** | | |T | | +-------++-+-------------------------------+ *| | | 1 thru 8 SCSI devices +---------------+--------------+ **| **| |* +--------+---+ +---------+--+ +--------++-++ |Disc Drive | |Disc Drive | |Disc | T|| |or other | |or other | |Drive or+--+| |SCSI device | |SCSI device | |other SCSI | +------------+ +------------+ +------------+ * Closed end type connector used ** Open type (in-line application) Connector used. *** Host need not beon the end of the daisy chain. Another device can be on the end with the terminator, the host having no terminator. T indicates termination required. DC Cable and Connector ---------------------- The disc drive receives DC power through a 4 pin rigth angle connector mounted on the rear of the Main PWA. Recommended part numbers for the mating connector are included below, but equivalent parts may be used. Type of cable: 18 AWG Connector: AMP 1-480424-0 Contacts: AMP 60619-4 (Loose Piece); AMP 61117-4 (Strip) Connector Requirements ---------------------- The nonshielded cable connector shall be a 50 conductor connector consisting of two rows of 25 female contacts with adjacent contents 100 mils apart. Recommended Mating Flat Cable Connector Part Numbers are: Closed end 3M-3425-7000 W/O Strain Relief, No Center Key (for cable 3M-3425-7050 With Strain Relief, No Center Key ends) Dupont-66900-290 With Strain Relief, With Center Key Open end 3M-3425-6000 W/O Strain Relief, No Center Key (In Daisy- 3M-3425-6050 With Strain Relief, No Center Key chain) Dupont-66900-250 With Strain Relief, With Center Key Grounding --------- Signal ground (PWA) and HDA ground are connected together in the drives and cannot be separated by the user. The chassis ground is not connected to the HDA and PWA ground. A chassis grounding quick disconnect Tab is provided at the rear of the drive above the DC power connector. Mating connector to connect a system chassis ground to the grounding tab is AMPP/N 62137-2. If it is desired for the system chassis ground to be connected to the HDA/PWA ground, the systems integrator or user must provide a flexible ground strap be- tween HDA and chassis ground point. Such a strap must not interfere with the ability of the HDA to meet shock and vibration specifications. Termination ----------- The reference signal (REFSIG+) is terminated with a 2K ohm resistor. Each drive has a termination resistor located on the Main PWA. The terminator resistor is not removable and is always in the circuit. For the Single-ended I/O ST1481N and 1581N applications the SCSI bus MUST be terminated at both ends with ANSI SCSI-2 Standard's Alter- native 2 termination (active termination), especially if the bus will be operated at FAST SCSI transfer rates. The ST1481N and ST1581N provide active termination as the on-board termination option. Note: All terminators used in the daisychain absolutely must be active terminators as described above. Differential I/O models ST1481ND and ST1581ND do not have provisions to add terminator sockets on the PWA. The user or systems integrator must provide a terminator arrangement external to the drive. Drivers and Receivers --------------------- The driver circuits have the following electrical specifications: Negated (False): 0.0 V to +0.4 V @ I = - 48 mA (max). Asserted (True): +2.24 V to +5.25 V @ I = +250 uA Synchronized Spindle operation ------------------------------ The interface consists of a twisted pair cable that connects the drives in the synchronized system in a daisy chain configuration. Master/slave operation will be automatically set by the drives in the system at power up time, or each drive in the system can be configured by the host (using Mode Select command) to operate in either the master or slave mode. While loading heads after power up, a drive checks for occurrences of the reference signal (REFSIG+). If there are no reference pulses occuring, the drive takes over as a master and begins sending the reference index signal. Drives can be re-configured by the host any time after power up to be master or slave by use of the Mode Select command Rigid Disc Drive Geometry page. The master provides the reference signal to which all other drives phase lock, including the master. There is only one master per system, and that can be a drive or the host computer. All drives may be configured as slaves allowing the host to provide the reference signal. All drives default to the synchronized mode when powered up. Each drive can later be configured for the non-synchronized mode in which it ignores any reference signal that might be present. The connection of the synchronized reference signal to the host is required only if the host is to provide the reference signal. If the host does not provide the reference signal, the host should not be connected and the master should be drive #1. ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST1481/1581-N/ND PRODUCT MANUAL 77738471-A Standards --------- The ST1481N/ND, ST1581N/ND has been developed as a system peripherals to the highest standards of design and construction. The drives depends upon its host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regualations. Special attention must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. The ST1481N/ND, ST1581N/ND is a UL Recognized component per UL1950 and a CSA Certified Component per CSA C22.2, No. 950-M89. It also meets the requirements of DIN VDE 0805/05.90 and EN 60950:1988 (IEC 950). The ST1481N/ND, ST1581N/ND, as delivered, is designed for system integration before use. It is supplied as a component or subassembly. as defined to the FCC Rules and Regulations, Part 15, Subpart J governing EMI of computing devices end the Radio Interference Regulations of the Canadian Department of Communications. The drives are, therefore not directly subject to the FCC rules and regulations or the Radio Interference Regulations of the Canadian Department of Communications. Media Description ----------------- The media used on the drive has a diameter of approximately 3.5 inches (89mm). The aluminium substrate is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection. Defect and Error Management --------------------------- The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon use of defect management routines by the host (initiator). Defect and error management in the SCSI systm involves the drive internal defect/error management and SCSI systems error considerations (errors in communications between Initiator and the drive). Power Sequencing ---------------- Power sequencing is not required for the drive. The drive protects against inadvertent writing during power up and down. Daisychain operation requires that power be maintained on the terminated unit to ensure proper termination of the peripherals I/O cables. Temperature ----------- The drive will meet all specification over 41*F to 122*F (5*C to 50*C) operating ambient temperature range with a maximum gradient of 36* F (20* C) per hour. Heat/Power Dissipation ---------------------- For drives with single ended interface circuits, typical dissipation is 12 watts (41 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 9.5 watts (32.4 BTUs per hour). For drives having differential interface circuits, typical power dissipation is 13.7 watts (46.8 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 11.2 watts (38.2 BTUs per hour). Options ------- All options are incorporated or packaged at the manufacturing facility. ********************************************************************** G E N E R A L ********************************************************************** SEAGATE SUPPORT SERVICES Seagate Technology ------------------ Technical Support Services If you need assistance installing your drive, consult your dealer. Dealers are familiar with their unique system configurations and can help you with system conflicts and other technical issues. If you need additional assistance with your Seagate(r) drive or other Seagate products, use one of the Seagate technical support services listed below. SeaFONE at 1-800-SEAGATE (1-800-732-4283) Seagate's 800 number allows toll-free access to automated self-help services, providing answers to commonly asked questions, troubleshooting tips and specifications for disc drives and tape drives. This service is available 24 hours daily and requires a touch-tone phone. If you need to speak to a technical support engineer, dial this number and listen to the options for technical support. (International callers can also reach this automated self-help service by dialing 408-456-4496). Seagate Technology online services Using a modem, you can obtain troubleshooting tips, free utility programs, drive specifications and jumper settings for Seagate's entire product line. You can also download software for installing and analyzing your drive. SeaNET You can obtain technical information on Seagate drives, Seagate software and much more over the Internet from Seagate's World Wide Web home page (http://www.seagate.com) or Seagate's ftp server (ftp://ftp.seagate.com). You may also send E-mail with your questions to DiscSupport@ Seagate.com or TapeSupport@Seagate.com. SeaBOARD SeaBOARD is a computer bulletin board system (BBS) that contains information about Seagate's disc and tape drive products and is available 24 hours daily. Set your communications software to eight data bits, no parity and one stop bit (8-N-1). SeaBOARD phone numbers are listed in the following table. BBS Location Modem number United States Disc: 408-434-1080; Tape: 408-456-4415 England 44-1628-478011 France 33 1-48 25 35 95 Germany 49-89-140-9331 Singapore 65-292-6973 Thailand 662-531-8111 Australia 61-2-9756-2359 Taiwan 886-2-719-6075 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 answers on the forum messages. Seagate Technology FAX services SeaFAX You can use a touch-tone telephone to access Seagate's automated FAX system to receive technical support information by return FAX. This service is available 24 hours daily. Location Telephone number United States 1-800-SEAGATE or 408-456-4496 England 44-1628-894084 Australia 61-2-9756-5170 Seagate technical support FAX You can FAX questions or comments to technical support specialists 24 hours daily. Responses are sent during business hours. Location FAX number United States 408-944-9120 England 44-1628-890660 France 33 1-46 04 42 50 Germany 49-89-1430-5100 Australia 61-2-9725-4052 Singapore 65-293-4722 Hong Kong 852-2368 7173 Taiwan 886-2-715-2923 Korea 82-2-556-7294/4251 Seagate technical support You can talk to a technical support specialist during business hours Monday through Friday for one-on-one technical help. Before calling, note your system configuration and drive model number (STxxxx). There are several technical support phone numbers available for various Seagate products. Location Telephone number United States Please dial 1-800-SEAGATE for the specific product telephone number. (6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M., Pacific time, 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; (9:30 A.M. to 12:30 P.M., 2:00 P.M. to 4:00 P.M., M-F) Tape: 49-89-140-9333 Australia 61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M-F) Singapore 65-290-3998 (9:00 A.M. to 12:00 P.M., 2:00 P.M. to 5:00 P.M., M-F) Hong Kong 852-2368 9918 Taiwan 886-2-514-2237 Korea 82-2-556-8241 SeaTDD 408-944-9121 Using a telecommunications device for the deaf (TDD), you can send questions or comments 24 hours daily and exchange messages with a technical support specialist between 6:00 A.M. to 11:15 A.M. and 12:30 P.M. to 5:00 P.M. (Pacific time) Monday through Friday. Customer Service Centers Seagate direct OEM, Distribution, System Integrator and Retail customers should contact your Seagate Service Representative for warranty information. Other customers contact your place of purchase. Seagate offers comprehensive customer support for all Seagate drives. Seagate customer service centers are the only facilities authorized to service Seagate drives. These services are available worldwide. Location Telephone number FAX number United States 1-800-468-3472; 405-949-6740 Other Americas (Canada & Brazil) 405-949-6706; 405-949-6738 Mexico 525-546-6965; 525-546-4888 Europe, Middle East & Africa 31-2065-43300; 31-2065-34320 Asia Pacific & Australia 65-485-3595; 65-485-4980 Japan 81-3-5462-2904; 81-3-3462-2979 Seagate, Seagate Technology and the Seagate logo are registered trademarks of Seagate Technology, Inc. SeaFAX, SeaFONE, SeaBOARD, SeaTDD, SeaNET, Medalist and DiscWizard are either trademarks or registered trademarks of Seagate Technology, Inc. or one of its subsidiaries. All other trademarks or registered trademarks are the property of their respective owners.