D 3 8 6 1 NEC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/HH Cylinders 915| | | Capacity form/unform 114/ 134 MB Heads 7| | | Seek time / track 20.0/ 5.0 ms Sector/track 35| | | Controller SCSI1 SINGLE-ENDED Precompensation Cache/Buffer KB Landing Zone Data transfer rate 1.250 MB/S int Bytes/Sector 512 MB/S ext Recording method RLL 2/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 5 50 | -40 60 Power: sleep W Humidity % 8 80 | standby W Altitude km 3.000| 12.000 idle W Shock g 10 | 40 seek W Rotation RPM 3573 read/write W Acoustic dBA spin-up W ECC Bit MTBF h 300000 Warranty Month Lift/Lock/Park YES Certificates ********************************************************************** L A Y O U T ********************************************************************** NEC D3861 PRODUCT DESCRIPTION 806-520918-0 REV. A 1989 +---------------------------------------------------------+ | |XX | +-+ |XX | Terminator ON/OFF| | |XX | and mode SCSI ID +-+ |XX |+-+ setting switch +-+ |XX || | Parity check ON/ | | |XX J1 || | OFF Auto Start/ +-+ |XX |+-+ Inhibit +-+ |XX | | | |XX | +-+ |XX | |XX | |XX | | 1 | | | XXXXXXX|Power +---------------------------------------------------------+J3 ********************************************************************** J U M P E R S ********************************************************************** NEC D3861 PRODUCT DESCRIPTION 806-520918-0 REV. A 1989 Jumper Setting ============== SCSI Address Setting -------------------- The SCSI address is factory-set to "0". If two or more SCSI devices are connected to the same SCSI bus, alter the SCSI address with the switch shown in the following figure. Optional Function Setting ------------------------- This magnetic disk drive is provided with optional functions that can specify use or non-use of a Start/Stop Unit command, one of the SCSI commands, and ON/OFF of SCSI BUS parity check. This function is factory set so that the spindle motor starts regardless of a Start/ Stop Unit command and the parity check is set to ON automatically when the power is turned on. To start the spindle motors of two or more drivers sequentially with a Start/Stop Unit command, alter the switch setting beforehand as shown in following figure. + Parity | +------------- START CMD | | ADDR | | +-+-+ -------++-----------0-1-2--+0 x x x || x x x x x x x x | -------++---------------ON-+1 || \/ J1 connection side Auto Start = 0 Auto Start inhibit = 1 Parity check OFF = 0 Parity check ON = 1 SCSI Address Option Function Setting ------------------------------------ Setting of Use or Non-use of a Start/Stop Unit Command and ON/OFF of SCSI Parity Check. NOTE Setting of the SCSI ADDRESS switch is read during resetting or when power is turned on. NOTE Setting of the AUTO MOTOR START and PARITY CHECK ON/OFF switches becomes valid immediately after setting. +----------+-----------------------+ | SCSI ID | ADDR. | | | 2 | 1 | 0 | +----------+-------+-------+-------+ | 0 | 0 | 0 | 0 | +----------+-------+-------+-------+ | 1 | 0 | 0 | 1 | +----------+-------+-------+-------+ | 2 | 0 | 1 | 0 | +----------+-------+-------+-------+ | 3 | 0 | 1 | 1 | +----------+-------+-------+-------+ | 4 | 1 | 0 | 0 | +----------+-------+-------+-------+ | 5 | 1 | 0 | 1 | +----------+-------+-------+-------+ | 6 | 1 | 1 | 0 | +----------+-------+-------+-------+ | 7 | 1 | 1 | 1 | +----------+-------+-------+-------+ J1 connection side /\ || + The shaded portions denote projected || | portions. +----------------+ +--------|-------+ +----------------+ ON | x x x x | |x x x x x x x x | |x x x x x x x x | |x x x x | | | | | +----------------+ +----------------+ +----------------+ +------TERM. ON/OFF SWITCH------------------+ ********************************************************************** I N S T A L L ********************************************************************** NEC D3861 PRODUCT DESCRIPTION 806-520918-0 REV. A 1989 Notes On Installation ===================== The D3861 magnetic disk drive can be installed both horizontally and vertically. When installing the drive horizontally, be sure to install it with the main pronted wiring assembly faced down. (Do NOT face the front panel upward or downward.) The drive has eight mounting tap holes. An SCSI bus cable and power cable are required to operate the drive. If two or more SCSI devices are connected to the same SCSI bus cable, SCSI address setting and terminating resistor ON/OFF switch must be altered properly. The drive has a switch for accepting or rejecting and Auto Motor Start at power on and that for setting of ON/OFF of SCSI BUS parity check. These switches must be set depending on the operation conditions. Drive Configuration ------------------- This magnetic disk drive consists of a disk enclosure assembly that contains recording disks, magnetic heads, and a magnetic head drive mechanism; one printed wiring assemblies; a frame; and a front panel. Disk Enclosure Assembly ----------------------- The disk enclosure assembly contains recording disks, magnetic heads, a head carriage mechanism, a DC motor with encoder, and an air filter. An inside-hub type DC brushless motor is used as a spindle motor to rotate recording disks. Air can go into or come out of the disk enclosure assembly only through the air filter provided on the top cover off the assembly. The air in the assembly is therefore kept highly clean. Printed Wiring Assembly ----------------------- The printed wiring assembly includes an SCSI interface circuit, buffer RAM, data manager, read/write control circuit, servo control circuit, and DC motor drive circuit to control all drive operations and interfaces. Power Supply ------------ The D3861 magnetic disk drive requires +5 VDC and +12 VDC power for operation. Dimensions ---------- Height 41.3 mm Width 101.6 mm Depth 157 mm Weight 1.0 kg or less NOTE Front plate excluded Interface --------- This drive has connector J1 for connection to SCSI bus and connector J3 for power supply. The device connected at each furthest end of the cable must have a terminating resistor installed. If the initiator and targets use different power supplies, power for terminating resistor of the target should be supplied through pin 26 of the SCSI bus. Single Initiator, Single Target ------------------------------- Initiator Target XXXXXXX <*****SCSI*Bus************> XXXXXX Single Initiator, Multi Target ------------------------------ Initiator Target XXXXXXX <*****SCSI*Bus************> XXXXXX : : Target :***> XXXXXX Multi Initiator, Multi Target ----------------------------- Initiator Target XXXXXXX <*****SCSI*Bus************> XXXXXX : : XXXXXXX <*******: : Target Initiator :***> XXXXXX Connetcor J1 ------------ A 50-pin non-shielded connector used for interface to the SCSI bus. Fifty-conductor flat cables and 25-signal twisted-pair cables can be used for the SCSI bus. Cables of impedance 100 ohms 10% and conductor diameter 28 AWG or more should be used to match the impedance of the drive. Example of recommended connector on the J1 cable side: DuPont 66900-250 or equivalent (monolithic housing and pin) Connector J3 ------------ Connector J3 for power supply is an AMP P/N 350211-1 or equivalent. The connector housing AMP P/N 1-480424-0 of the cable suits this connector. Select a power cable, considering the current consumption and cable length into consideration. The connector pins must fit here. |+-----J3-----+ pin 1 +12 VDC || 4 3 2 1 | pin 2 +12 Volts Return |+------------+ pin 3 + 5 Volts Return +---------------- pin 4 + 5 VDC ********************************************************************** F E A T U R E S ********************************************************************** NEC D3861 PRODUCT DESCRIPTION 806-520918-0 REV. A, 1989 Outline and Features -------------------- The D3861 Magnetic Disk Drive has an unformatted storage capacity of 134.45 megabytes with 3.75-inch magnetic disk media and mini Winchester magnetic heads incorporated, employing a Small Computer System Interface (SCSI). The magnetic head drive mechanism employs a DC motor with encoder, achieving high-speed seek and highly reliable read/write operations. A large capacity is also achieved with a 2-7 RLL modulation method adopted for read/write operation. Logical Connection to SCSI Initiator ------------------------------------ This drive operates as an SCSI target and has no initiator function. Logical connection to the SCSI initiator is executed according to the SCSI logical specifications. This drive has an arbitration function for disconnection/ reconnection. It operates on the basis that the initiator has a disconnect/reconnect function, an SCSI Message Identify signal must be sent for a Disconnect message from the drive to indicate that the initiator does not have that function. In the non-arbitrating system, SCSI logical connection is executed in the information transfer phase through the selection phase, one of the SCSI bus phases, as a starting phase. In the arbitrating system, SCSI logical connection is executed in the information transfer phase through the arbitration phase and selection phase. Detecting Drive Errors ---------------------- This drive has various self-diagnostic functions. It can read extebded sense data with a Request Sense command of the SCSI inter- face. You should execute a Request Sense command if an error occurs. Diagnoses other than for errors can be executed with a Send Diagnostic command. This drive supports the selftest specified with a Send Diagnostic command. If an error is detected, the check condition bit is set to "1". The detailed diagnosis result can be received by executing a Request Sense command. SCSI Interface Signals ---------------------- The Unit employs a SCSI Single-Ended type interface. The Single-Ended type interface uses a terminal resistance of 220 / 330 . The logical specification and the electrical specification of the signals dealt with in this section are as follows: 1. Output Characteristics Signal assertion =0.0 0.4 VDC @ I=-48 mA Signal negation =2.5 5.25 VDC 2. Input charateristics Signal true : "1" =0.0 0.8 VDC @ I=500 A Signal false : "0" =2.0 5.25 VDC 3. Terminator power VTerm = 4.0 5.25 VDC @ I=800 mA