D 3 8 4 1 NEC NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 440| | | Capacity form/unform 45/ 56 MB Heads 8| | | Seek time / track 28.0/ 8.0 ms Sector/track 25| | | Controller SCSI1 SINGLE-ENDED Precompensation 65535 Cache/Buffer KB Landing Zone Data transfer rate 0.937 MB/S int Bytes/Sector 512 0.937 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 | 8 90 standby W Altitude km 3.000| 12.000 idle W Shock g 5 | 40 seek W Rotation RPM 3600 read/write W Acoustic dBA spin-up W ECC Bit MTBF h 30000 Warranty Month Lift/Lock/Park - Certificates ********************************************************************** L A Y O U T ********************************************************************** NEC D3841 PRODUCT DESCRIPTION 806-520776-0 REV. 2 +---------------------------------------------------------+ | |XX | +-+ |XX | Switch 1| | |XX | +-+ |XX | +-+ |XX | Switch 2| | |XX J1 | +-+ |XX | +-+ |XX | Switch 3| | |XX | +-+ |XX | |XX | |XX | | | | | XXXXXXX|Power +---------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** NEC D3841 PRODUCT DESCRIPTION 806-520776-0 REV. 2 Jumper Setting ============== +----------------+ +----------------+ +----------------+ 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------------------+ An SCSI bus cable and power cable are required to operate the drive. If two or more SCSI device 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 an 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 operating conditions. ********************************************************************** I N S T A L L ********************************************************************** NEC D3841 PRODUCT DESCRIPTION 806-520776-0, REV. 2 Notes On Installation ===================== The D3841 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 pronted 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. The spindle motor drive circuit is located in the spindle motor section and drives the spindle motor with control signals sent from the printed wiring assembly. Power Supply ------------ The D3841 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 is not included 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. 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, and use connector pins that suit the cable material. |+-----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 D3841 PRODUCT DESCRIPTION 806-520776-0 REV. 2 Outline and Features -------------------- The D3841 Magnetic Disk Drive has an unformatted storage capacity of 56 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. Power Off --------- Before power off for transporting, it is recommended that the host commands a Motor Stop command that makes retract the heads to the Contact Start Stop (CSS) area at inner most of disks. 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 (minimum input hysteresis = 0.2 VDC) 3. Terminator power VTerm = 4.0 5.25 VDC @ I=800 mA