
S T 5 6 6 0 N C    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SUPERSLIMLINE    Cylinders    3002|     |     |
Capacity form/unform   545/      MB        Heads           4|     |     |
Seek time   / track  13.0/ 3.5 ms          Sector/track     |     |     |
Controller           SCSI2 SI/FAST/SCA     Precompensation
Cache/Buffer           256 KB READ-AHEAD   Landing Zone
Data transfer rate    4.000 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 55    |    -40 70
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle           2.5 W     Shock        g        10       |     75
       seek           6.0 W     Rotation   RPM      4500
       read/write     4.5 W     Acoustic   dBA        28
       spin-up            W     ECC        Bit
                                MTBF         h     300000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,UL1950,UL478,VDE         

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                        L   A   Y   O   U   T
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SEAGATE  ST5660NC  PRODUCT MANUAL 36245-004, REV. B, 9/94 DECLATHLON

  +---------------------------------------------------------+
  |                                                         |
  |                                                         |1
  |                                                         |XXI
  |                                                         |XXN
  |                                                         |XXT
  |                                                         |XXE
  |                                                         |XXR  J1
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
 +++                                                        |XXE
 | |J8                                                      |XX
 | |                                                        |
 | |                                                        |
 +++1                                                       |
  +---------------------------------------------------------+




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                      J   U   M   P   E   R   S
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SEAGATE  ST5660NC  PRODUCT MANUAL 36245-004, REV. B, 9/94 DECATHLON

 Options jumper block
 ---------------------
 Both ST5660N and ST5660NC have the options jumper block at J8.
 The options jumper block allows you to manually:

 - Enable or disable active termination

 - Set the SCSI ID address

 - Select the terminator power source

 - Enable parity

 - Activate the motor start/stop option

 - Attach a remote LED

 These functions are represented on the options jumper block for both
 drives. However, the ST5660NC allows you to control some of these
 functions through the SCSI bus.

 The jumper block accepts 2-mm jumpers. Spare jumpers are included
 with the drive attached to the pins shown in the figure. If you need
 additional jumpers, use the jumpers listed below or equivalent.

 Manufacturer       Partnumber
 Seagate            13211-001
 DuPont             89133-001
 Methode            8618-202-70

    J8 Options jumper block
   +-----------------------------------+  +-+
   |33 o o o o o o o o o o o o o o o 1 |  V |
 --+34 o o o o o o o o o   o o o o o 2 +--- Circuit board side up
   +-----------------------------------+
   | o o o o  |   |         |   |     | Spares                       |
   | xxx xxx  |   |         |   |     |                              |
   +----------+---+---------+---+-----+------------------------------+
              |   |         |   |o o o| SCSI ID 0                    |
              |   |         |   |o o o|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |X o o| SCSI ID 1                    |
              |   |         |   |X o o|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |o X o| SCSI ID 2                    |
              |   |         |   |o X o|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |X X o| SCSI ID 3                    |
              |   |         |   |X X o|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |o o X| SCSI ID 4                    |
              |   |         |   |o o X|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |X o X| SCSI ID 5                    |
              |   |         |   |X o X|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |o X X| SCSI ID 6                    |
              |   |         |   |o X X|                              |
              |   |         |   +-----+------------------------------+
              |   |         |   |X X X| SCSI ID 7                    |
              |   |         |   |X X X|                              |
              |   |         +---+-----+------------------------------+
              |   |         |o X|       Reserved Do not use          |
              |   |         |o X|                                    |
              |   |         +---+------------------------------------+
              |   |         |X o|       Remote LED connection        |
              |   |         |X o|                                    |
              +---+---------+---+------------------------------------+
              |   |o o X o o|   |       Remote start                 |
              |   |o o X   o|   |                                    |
              +---+---------+---+------------------------------------+
              |   |o X o o o|   |       Parity enable                |
              |   |o X o   o|   |                                    |
              +---+---------+---+------------------------------------+
              |   |X o o o o|   |       Terminator disable           |
              |   |X o o   o|   |                                    |
              +---+---------+---+------------------------------------+
              |X o|         |   |       Power from drive power       |
              |X o|         |   |       connector                    |
              +---+---------+---+------------------------------------+
              |xxx|         |   |       Power from SCSI bus          |
              |o o|         |   |                                    |
              +---+---------+---+------------------------------------+
              |xxx|         |   |       Power from drive power       |
              |xxx|         |   |       connector and to SCSI bus    |
              +---+---------+---+------------------------------------+
              |o o|         |   |       Power to SCSI bus only       |
              |xxx|         |   |                                    |
              +---+---------+---+------------------------------------+


 Active Termination
 ------------------
 The ST5660N and ST5660NC use a jumper on the options jumper block to
 enable active termination. You can order the drive with the active
 termination enabled or disabled. Active termination is enabled when a
 jumper is placed on pins 19 and 20 of the options jumper block.
 Active termination is disabled when there is no jumper on pins 19 and
 20 of the options jumper block.


 SCSI address
 ------------
 SCSI ID is set on the ST5660N and ST5660NC using pins 1 and 2, 3 and
 4 and 5 and 6 on the options jumper block. The drives are shipped
 with jumpers on pins 1 and 2 and pins 3 and 4 for configuring the
 SCSI ID. This means the drives have a default address of SCSI ID 3.
 You may need to reset the drive's address for your operation. Refer
 to your host adapter reference manual for its preferred addressing
 scheme.


 Terminator power source selection
 ----------------------------------
 To select the termination power source, install jumpers as follows:
 - To select the drive power connector as the termination power
   source for the resistor packs, install a jumper on pins 23 and 24
   of the options jumper block.

 - To select the SCSI connector as the termination power source for
   the resistor packs, install a jumper on pins 21 and 23 of the
   options jumper block.

 - To provide terminator power to the SCSI connector and the drive
   terminator packs, install jumpers on pins 21 and 23 and pins 22 and
   24 of the options jumper block. This is the default.

 - To provide terminator power to the SCSI connector from the drive
   power connector only, install a jumper on pins 22 and 24 of the
   options jumper block.


 Parity enable option
 --------------------
 When a jumper is installed on pins 17 and 18 of the options jumper
 block, the parity bit is used. This is the default. When a jumper is
 not installed on pins 17 and 18 of the options jumper block, the
 parity bit is not used.


 Start/stop option
 -----------------
 When a jumper is installed on pins 15 and 16 of the options jumper
 block, the drive waits for a Start/Stop Unit command from the host
 before starting or stopping the spindle motor.


 Remote LED connection
 ---------------------
 Pins 9 and 10, located on the options jumper block, are reserved for
 a remote LED. Pin 9 is ground. Use any 2-pin, 2-mm connector and, if
 you are placing the drive in an array configuration, we recommend the
 LiteOn (part number LTL-3231A) LED or equivalent.


 Daisy chaining
 --------------
 The drive can be connected in a daisy chain with a maximum of eight
 SCSI devices (including the host) that have single-ended drivers and
 receivers. Each SCSI device must be set to a unique SCSI ID number.
 SCSI ID 7 is usually used for the host adapter.
 All signals are common between all SCSI devices. The SCSI devices at
 both ends of the daisy chain must be terminated; the intermediate
 SCSI devices should not be terminated.



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                      I   N   S   T   A   L   L
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SEAGATE  ST5660N/NC  PRODUCT MANUAL 36245-004, REV. B, 9/94 DECLATHLON

 Notes On Installation
 =====================

 Mounting the drive
 ------------------
 The ST5660N and ST5660NC are 3.5-inch form-factor drives with a
 one-inch profile. You can mount them securely in the computer using
 either the bottom or side mounting holes, as described below.
 Position the drive so that you do not strain or crimp the cables.

 Bottom mounting holes. Insert 6-32 UNC-2A mounting screws in the four
 available bottom mounting holes. Do not insert the screws more than
 0.20 inches (6 turns) into the drive frame.
 Side mounting holes. Insert 6-32 UNC-2A mounting screws in four of
 the six available side mounting holes. Use two mounting holes on each
 side of the drive. Do not insert the screws more than 0.20 inches (6
 turns) into the drive frame.

 Caution. To avoid damaging the drive:
 - Use only mounting screws of the type specified.
 - Gently tighten the mounting screws_do not apply more than 6
   inch-lb of torque.


 Auto-park
 ---------
 Upon power-down, the read/write heads automatically move to the
 shipping zone. The heads park inside the maximum data cylinder. When
 power is applied, the heads recalibrate to track 0. Caution. Do not
 move the drive until the spindle motor has come to a complete stop;
 otherwise, you may damage the drive.


 DC power
 --------
 Except during the write procedure, you can apply power to the drive
 or remove power from the drive, in any sequence, without losing data
 or damaging the drive. If you remove power from the drive during the
 write procedure, you may lose the data currently being written.


 Electrical interface
 --------------------
 Decathlon family drives are designed to use singled-ended interface
 signals. They employ singled-ended drivers and receivers and active
 terminator circuitry.

 - Transmitter characteristics. The drive uses 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 volts.

 - Receiver characteristics. The drive uses an ANSI SCSI single-ended
   receiver with hysteresis gate or equivalent as a line receiver.
   The loss in the cable is defined as the difference between the
   voltages of the input and output signals, as shown below:

   Logic level   Driver output (x)    Receiver input (x)

   Asserted (1)  0.0V   x   0.4V      0.0V   x   0.8V
   Negated (0)   2.5V   x   5.25V     2.0V   x   5.25V


 Interface and connector configuration
 -------------------------------------
 The Seagate ST5660N and ST5660NC drives are differentiated by their
 connectors. The ST5660N comes with a standard 50-pin interface
 connector, a standard 4-pin power connector and an auxiliary SCSI ID
 block. The ST5660NC comes with a single, 80-pin SCA interface
 connector. The connectors for both drives are discussed below. To
 minimize noise, use unshielded mating connectors.


 ST5660N interface connector
 ---------------------------
 The ST5660N uses a standard 50-pin, nonshielded, keyed connector. The
 connector consists of two rows of 25 male contacts 0.100 inches
 apart. Recommended mating connectors are listed below with their
 part numbers.

 Part numbers for mating 3M connectors compatible with the drive are
 listed below. These connectors do not have a center key and are
 available with or without a strain relief.

                         | No strain relief | With strain relief
                         | No center key    | No center key
  -----------------------+------------------+----------------------
  Closed end             |                  |
  (for cable ends)       | 3M 3425-7000     | 3M 3425-7050
  Open end               |                  |
  (for daisy chain)      | 3M 3425-6000     | 3M 3425-6050

 Part numbers for mating Molex connectors compatible with the drive
 are listed below. These connectors have a center key.

 Closed end
 (for cable ends)         Molex 39-51-2504
 Open end
 (for daisy chain)        Molex 39-51-2501

 Below are part numbers for strain reliefs that can be used with the
 Molex connectors.

 Molex strain relief,
 preferred version
 in Europe                Molex 90170-0050
 Molex strain relief,
 preferred version
 in Japan                 Molex 15-25-1503


 ST5660N interface connector pin assignments
 -------------------------------------------
 The table below shows the pin assignment for the 50-pin interface
 connector. A minus sign (-) indicates an active-low signal.

  Signal name   Signal pin number    Ground pin number
  DB(0)-              2                    1
  DB(1)-              4                    3
  DB(2)-              6                    5
  DB(3)-              8                    7
  DB(4)-             10                    9
  DB(5)-             12                   11
  DB(6)-             14                   13
  DB(7)-             16                   15
  DB(P)-             18                   17
  Ground             19-22                 _
  Reserved           23-25                 _
  Terminator power   26                    _
  Reserved           27-28                 _
  Ground             29-30                 _
  ATN-               32                   31
  Ground             33-34                 _
  BSY-               36                   35
  ACK-               38                   37
  RST-               40                   39
  MSG-               42                   41
  SEL-               44                   43
  C/D-               46                   45
  REQ-               48                   47
  I/O-               50                   49

 Caution.
 Do not connect pin 25 to ground. If you plug in the connector upside
 down, the terminator power on pin 26 is shorted to ground. This may
 damage the drive.


 ST5660NC interface connector
 ----------------------------
 The ST5660NC uses an 80-pin, male, SCA connector. It is a single
 piece connector that allows power for the drive to be transmitted
 through the SCSI bus. The remote LED, motor start options and
 additional binary codes are also placed on the SCSI bus.

 We recommend the AMP Champ 50 mating connector (part number
 94-0682-10-1).


 ST5660NC interface connector pin assignments
 --------------------------------------------
 The following table shows the pin assignments for the ST5660NC 80-pin
 connector. A minus sign (-) indicates an active-low signal.

 Signal    Pin number     Signal     Pin number
  +12V         1           12V GND      41
  +12V         2           12V GND      42
  +12V         3           12V GND      43
  +12V         4           12V GND      44
  NC           5           NC           45
  NC           6           NC           46
  NC           7           GND          47
  NC           8           GND          48
  NC           9           GND          49
  NC          10           GND          50
  IO-         11           GND          51
  REQ-        12           GND          52
  C/DQ-       13           GND          53
  SEL-        14           GND          54
  MSG-        15           GND          55
  RST-        16           GND          56
  ACK-        17           GND          57
  BSY-        18           GND          58
  ATN-        19           GND          59
  DBP-        20           GND          60
  DB7-        21           GND          61
  DB6-        22           GND          62
  DB5-        23           GND          63
  DB4-        24           GND          64
  DB3-        25           GND          65
  DB2-        26           GND          66
  DB1-        27           GND          67
  DB0-        28           GND          68
  NC          29           GND          69
  NC          30           GND          70
  NC          31           GND          71
  NC          32           GND          72
  NC          33           GND          73
 +5V          34           5V GND       74
 +5V          35           5V GND       75
 +5V          36           5V GND       76
  NC          37           LEDC*1       77
  MTRON*2     38           DLYDST*3     78
  SCSIA0*4    39           SCSIA1*4     79
  SCSIA2*4    40           SCSIA3*4     80

 Notes 1 to 4 indicate pins also represented on the options jumper
 block.

 Notes:
 1. Drive activity signal; same as remote LED setting.
 2. Asserted by host to enable Motor Start option (starts motor
    through the SCSI bus command). Settings are mutually ex-clusive
    option.
 3. Asserted by host to enable the Delayed Motor Start option (motor
    starts at power on or after a delay of 12 seconds times the drive
    ID). This is a mutually-exclusive option.
 4. Binary code on A0, A1, A2 and A3 asserted by host to set up SCSI
    bus ID in drive.


 Interface cable requirements
 ----------------------------
 A characteristic impedance of 100 ohms +10% is recommended for the
 unshielded flat or twisted pair interface cable. However, most
 available cables have a somewhat lower characteristic impedance. To
 minimize discontinuities and signal reflections, do not use cables of
 different impedances in the same bus. Implementation may require
 tradeoffs in wielding effectiveness, cable length, the number of
 loads and the transfer rates to achieve satisfactory system
 operation. If shielded and unshielded cables are mixed within the
 same bus, the effect of impedance mismatch must be carefully
 considered. This is especially important for maintaining adequate
 margin for Fast SCSI transfer rates.

 To minimize noise, use 28 AWG or larger 50-conductor flat cable or
 25-conductor twisted pair ribbon cable. The following are part
 numbers for nonshielded flat cables we recommend:

 Part          Manufacturer
 Flat Cable    3M-3365-50
 Twisted Pair  Spectra Twist-N-Flat 455-248-50


 Interface cable length for asynchronous operation
 -------------------------------------------------
 The SCSI interface cable must meet the following requirements for
 normal operation:

 - The cable cannot be longer than 6.0 meters.
 - Cable stubs cannot be more than 0.1 meter long and must be
   separated by at least 0.3 meter.


 Interface cable for Fast SCSI operation
 ---------------------------------------
 When using fast synchronous data transfer rates, the SCSI interface
 cable must meet the following additional requirements:

 - The cable cannot be longer than 3.0 meters.
 - The cable should not attenuate a 5 MHz signal more than 0.095 dB
   per meter.
 - The DC resistance at 20*C must not exceed 0.230 ohms per meter.
 - A shielded, twisted-pair cable should not have a propagation delay
   delta greater than 20 nsec per meter.


 Hot-plugging
 ------------
 You can connect and disconnect the I/O and power cables for each SCSI
 device in a daisy chain without powering down the system. This is
 called hot-plugging. When hot-plugging, the following conditions must
 be met:

 - The terminators at either end of the SCSI bus are in place.
 - The drive you are disconnecting or connecting is not the device
   supplying terminator power or terminating resistance to the bus.
 - All I/O transactions are complete before you install or remove a
   drive.

 To avoid damage to the disc and head, the spindle must be completely
 stopped and the heads must be parked before you remove the drive from
 the system. There are two ways to stop the spindle and park the
 heads:

 - If the drive is not configured to use the remote start/stop
   feature, disconnect the DC power cable from the drive DC power
   connector and wait 30 seconds.
 - If the drive is configured to use the remote start/stop feature,
   issue the Start/Stop Unit command and wait 30 seconds.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
SEAGATE  ST5660N/NC  PRODUCT MANUAL 36245-004 REV. B, 9/94 DECLATHLON

 Formatted capacity
 ------------------
 The capacities specified here do not include spare sectors and
 cylinders. The media contains one spare sector per track and two
 spare cylinders per drive.

 Formatted capacity (Mbytes*) 545.29
 Total sectors 1,065,036

 * One Mbyte equals one million bytes.


 Reliability
 -----------
 Read error rates are measured with automatic retries and data
 correction with ECC enabled and all flaws reallocated. MTBF is
 measured at nominal power at sea level and 40*C ambient temperature.

 Nonrecoverable read errors 1 per 10(13) bits transferred
 Seek errors 1 per 10(7) physical seeks
 MTBF 300,000 power-on hours
 Service life 5 years


 Seek time
 ---------
 All seek time measurements are taken under nominal conditions of
 temperature and voltage with the drive mounted horizontally. In the
 following table:

 - Track-to-track seek time is the average of all possible
   single-track seeks in both directions.
 - Average/typical seek time is a true statistical random average of
   at least 5,000 measurements of seeks in both directions between
   random cylinders, less overhead.
 - Full-stroke seek time is one-half the time needed to seek from
   logical block address zero (LBA 0) to the maximum LBA and back to
   LBA 0.


 Read look-ahead and caching
 ---------------------------
 The drive uses algorithms that improve seek performance by storing
 data in a buffer and processing it at a more convenient time. Three
 methods are used: read look-ahead, read caching and write caching.


 Power management
 ----------------
 The drive supports power-management modes that reduce its overall
 power consumption. The drive automatically changes from one mode to
 another in response to interface activity. You do not need to change
 any parameters or send any special commands to make the drive change
 modes. The power-management modes are described below.

 - Spinup. Spinup is defined as the period during which the spindle is
   coming up to operating speed. The power consumed in this mode is
   equivalent to the average power during the first 10 seconds after
   the drive begins to spin up. Refer to the startup current chart in

 - Seeking. The servo electronics are active and the heads are moving
   to a specific location on the disc. The read/write electronics are
   powered-down. The power consumed in this mode is equivalent to the
   average power measured while executing random seeks with a 2-
   revolution (26.6 msec) dwell between seeks. The drive enters this
   mode from the Idle mode.

 - Read/Write. The drive is reading or writing. All electronics are
   active and the heads are on track. The drive enters this mode from
   the Idle mode.

 - Idle. The spindle is spinning, the heads are parked, and the servo
   and read/write electronics are powered down. The drive is ready to
   accept and execute any command after the heads recalibrate. The
   drive enters this mode from the Read/Write mode.

 - Standby. This mode is not implemented.


 Hardware and interface
 ----------------------
 The Seagate Decathlon family drives use a SCSI-2 interface that
 consists of a 9-bit bidirectional bus (8 data bits and 1 parity bit)
 and 9 control signals. The interface supports multiple initiators,
 disconnect and reconnect, self-configuring host software and logical
 block addressing.

 The interface employs a singled-ended driver/receiver configuration
 that uses asynchronous or synchronous communication protocols. It
 supports asynchronous transfer rates of up to 5 Mbytes per second
 and synchronous transfer rates of up to 10.0 Mbytes per second. The
 bus protocol supports multiple initiators, disconnect and reconnect,
 additional messages and 6-byte and 10-byte command descriptor blocks.
 The bus cable can be up to 6 meters long for standard mode and up to
 3 meters long for Fast SCSI mode.


 SCSI-2 compatibility
 --------------------
 The drive interface is described in the Seagate SCSI-2 Interface
 Manual, publication number 77738479. The drive complies with the
 mandatory subset of the ANSI SCSI-2 Interface.


