--------------------------------------------------------------------------- T H I S I S A D O C U M E N T I N A S C I I - F O R M A T ! ! ! --------------------------------------------------------------------------- To see the document in correct way under Windows 1. You must have installed a font with full ASCII-Character-Set (like TERMINAL) 2. Use a DOS-Editor like EDIT from original DOS-Version. EDIT filename.txt 3. Switch to DOS-Box and type in TYPE filename.txt | MORE 4. Switch to DOS-Box and print the file COPY filename.txt LPT1 TYPE filename.txt > LPT1 --------------------------------------------------------------------------- T H I S I S A D O C U M E N T I N A S C I I - F O R M A T ! ! ! --------------------------------------------------------------------------- ****************************************************************************** P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ****************************************************************************** S T 2 5 1 - 0 SEAGATE NO MORE PRODUCED Native³ Translation ÄÄÄÄÄÄÅÄÄÄÄÄÂÄÄÄÄÄÂÄÄÄÄÄ Form 5.25"/HH Cylinders 820³ ³ ³ Capacity form/unform 43/ 51 MB Heads 6³ ³ ³ Seek time í / track 38.0/10.0 ms Sector/track 17³ ³ ³ Controller MFM / ST412 Precompensation 65535 Cache/Buffer KB Landing Zone 910 Data transfer rate 0.625 MB/S int Bytes/Sector 512 0.625 MB/S ext Recording method MFM operating ³ non-operating ÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Supply voltage 5/12 V Temperature øC 10ö45 ³ -40ö60 Power: sleep W Humidity % 8ö80 ³ 5ö90 standby W Altitude km -0.305ö 3.048³ -0.305ö 9.144 idle W Shock g 10 ³ 40 seek W Rotation RPM 3600 read/write 11.0 W Acoustic dBA spin-up W ECC Bit MTBF h 100000 Warranty Month Lift/Lock/Park YES Certificates CSA,FCC,TUV,UL478,VDE P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ********************************************************************** L A Y O U T ********************************************************************** SEAGATE ST251/ST277R PRODUCT MANUAL 36035-003, REV.D ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ ³²² ³ ³²² J2 ³ ³²² ³ ³²²1 ³ ³ÚÄ¿1 ³ ³³ ³J7 ³ ³³ ³ ³ Terminator ÚÄ¿ ³ÀÄÙ15 ³ Resistor ³ ³ ³²² ³ Pack ³ ³ ³²² J1 ³ ³ ³ ³²² ³ ÀÄÙ ³²² ³ JP1Ü Ü Ü ³²² ³ Ü Ü ³²²1 ³ JP2 ³ ³ ³ÛÛ Power ³ ³ÛÛ J3 ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ********************************************************************** J U M P E R S ********************************************************************** SEAGATE ST251/ST277R PRODUCT MANUAL 36035-003, REV.D Jumper setting -------------- Ü = Jumper set at factory J7 is located between the J1 and J2 edge-connectors. ÚÄÄ Ä Ä Ä ÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄ Ä ÄÄ¿ J1 ÀÄÄ Ä Ä Ä ÄÄÙ ³16 14 12 10 8 6 4 2 ³ ÀÄÄ Ä ÄÄÙ J2 Edge-connector³15 13 11 9 7 5 3 1 ³ Edge-connector ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ J7 J7 Drive select ----------------- ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄ¿ ³Drive Select ³ 8-7 ³ 6-5 ³ 4-3 ³ 2-1 ³ ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄ´ ³Drive 4 ³ CLOSED³ OPEN ³ OPEN ³ OPEN ³ ³Drive 3 ³ OPEN ³ CLOSED³ OPEN ³ OPEN ³ ³Drive 2 ³ OPEN ³ OPEN ³ CLOSED³ OPEN ³ ³Drive 1 ³ OPEN ³ OPEN ³ OPEN ³ CLOSED³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÙ The Drive Select line enables the controller to select and adress the drive. Control cable interface options may use either a daisy- chain or radial configuration. J7 Factory Test Jumper ----------------------- Ü 9-10 OPEN 9-10 CLOSE Actuator seeks continuously This is a test function used during the manufacturing process and is not recommended for field use. When pins 9-10 at J7 are shorted, the actuator will continuously seek between Track 0 and the maximum data cylinder, ignoring control signals sent via interface. J7 and JP1 Write fault Latch ----------------------------- These options allow the user configure the Write Fault reset to specific system requirements using JP1 and J7. JP1 has three jumper pads, and is located adjacent to the 34-pin J1 connector. J7 is located midway between the PCB edge-connectors. JP1 1- 2 CLOSE STANDARD: Write Fault will be cleared when Write Gate is false. A Write Fault will only occur when Write Gate is true. 2- 3 CLOSE LATCHED: This option will maintain Write Fault true after Write Gates goes false and is recommended for controllers that do not edge-detect Write Fault. The latched operation has two configurations which are provided at the J7 shunt, pins 11-12. J7 11-12 OPEN The Write Fault signal can only be cleared by an poer on/off cycle. Use of this option in con- junction with the DC-Unsafe op- tion is not recommended. J7 11-12 CLOSE The Write Fault signal can be cleared by deselecting the drive. When the drive is deselected, and the fault condition is correct, the Write Fault signal will be false. When the Radial configuration jumper (pins 15-16 at J7) is used, the drive is continuously selected and requires a power on/off cycle to clear Write Fault. J7 Reserved ------------ 13-14 Reserved J7 Daisy-Chain/Radial Drive configuration ------------------------------------------ Ü 15-16 OPEN Daisy-Chain Mode CLOSE Radial Mode Drives can be configured in either a daisy-chain or radial mode. Radially-selected drives are always selected (See Write Fault). The resistor termination pack must remain installed on any radially configured drive. In a daisy-chain configuration, the last drive in a chain must have the resistor termination pack installed. JP2 DC-Unsafe Option --------------------- (ST251 and ST277R only) JP2 has two jumper pads, and when a jumper is installed, a DC- unsafe condition will cause a Write Fault to be sent to the interface. J3 DC Power and pin connector assignments ------------------------------------------- ÚÄÄÄÄÄÄÄÄÄÄÄÄ¿ pin 1 +12 VDC ³ 1 2 3 4 ³ pin 2 +12 Volts Return ÀÄÄÄÄÄÄÄÄÄÄÄÄÙ pin 3 + 5 Volts Return pin 4 + 5 VDC P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ********************************************************************** I N S T A L L ********************************************************************** SEAGATE ST251/ST252/ST277R/ST278R PRODUCT MANUAL 36035-003, REV.D Notes on installation ===================== Drive mounting -------------- horizontally vertically ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄ¿ ÚÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ ³ ³ ÃÄÄÄÄÄ¿ ÚÄÄÄÄÄ´ ³ ³ ³ x ³ ³ ³ ³ ³ ³ ³ ³ xÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿x ÚÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄ¿ ³ ³ ³ ³ ³ ³ ³³x x³³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ ³ ³ ³ ³ ³ ³³ x x ³³ ³ ³ ³ ³ ³ ³ ³³ x x ³³ x x ³ ³ ³ ³ ³ ³ ³³ x x ³³ ÚÄÄÄÄÄÄxÄÄÄÄÄÄxÄÄÄÄÄÄÄ¿ ³ ÃÄÄÄÄÄÙ ÀÄÄÄÄÄ´ ³ ³³ xx ³³ ÀÄÂÄÄÄÄÄÄxÄÄxÄÄÄÄÄÄÄÂÄÙ ÀÄÄÙ ÀÄÄÙ ³³ x x ³³ ³ xx ³ ³³ x x ³³ ³ x x ³ ³³ x x ³³ ÀÄÄÄxÄÄÄÄÄÄÄÄxÄÄÄÄÙ ³x x³ x x xÀÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÙx UNACCEPTABLE! UNACCEPTABLE! Never install PC board on the Top! The drive may be mounted horizontally with the PC board down or on either side. Mounting vertically on either end is a prohibited orienÄ tation. The drive should not be tilted front or back, in any position, by more than 5ø. For optimum performance, the drive should be formatted in the same position as it will be mounted in the host system. The mounting screws must not exceed inside the mounting feet more than 3.2 mm, measured from the outside surface of the foot. Shock and vibrations -------------------- All shock and vibration specifications assume that the drive is moun- ted in an approved orientation with the input levels at the drive mounting screws. Input Noise ----------- Maximum permitted input noise ripple: 100 mV (peak-to-peak) Maximum permitted input noise: 20 MHz. Ripple measured at the host system power supply across an equivalent 8ê resistive load on the +12 V line and an equivalent 3ê load on the +5 V line. Handling and Static-Discharge Precautions ----------------------------------------- After unpacking, and prior to system integration, the drive may be exposed to potential handling and ESD hazards. It is mandatory that you observe standard static-discharge precautions. A grounded wrist- strap is preferred. Handle the drive by the frame only and always rest the drive on a padded surface until it is mounted in the host system. Auto-Truncation --------------- The drive will enter the auto-truncation mode when: The the controller issues an excessive number of step pulses, which would place the read/write heads outward beyond Track 0 or inward beyond Track 910. The read/write heads are parked in the shipping zone (while power is continuously applied) and step pulses are subsequently issued. When the drive is in auto-truncation mode, it will ignore additional step pulses, take control of the actuator and recalibrate the heads to Track 0. Caution: If the controller is still issuing slow-step pulses after the drive issues Seek Complete from auto-truncation mode, the drive will: Reenter auto-truncation mode if Direction In is false Step the remaining cylinders if Direction In is true DC Power Requirements --------------------- Power may be applied or removed in any sequence without loss of data or damage to the drive. Voltage tolerance (incl. ripple): ñ5% Precompensation --------------- The drives are not require precompensation. FCC Verification ---------------- WARNING: The ST251, ST252, ST277R and ST278R are devices that are intended to be contained solely within a personal computer or similar enclosure (not attached to an external device). As such, they are considered to be a subassembly even when individually mar- keted to the customer. As a subassembly, no Ferderal Communications Comission authorization, verification or certification of the device is required. P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ********************************************************************** F E A T U R E S ********************************************************************** SEAGATE ST251/ST252/ST277R/ST278R PRODUCT MANUAL 36035-003, REV.D Media defect ------------ A media defect is a read error when data, which has been correctly written, cannot be recovered within 16 retries. Any media defects are noted on the drive defect map. Locations are noted by head, cylinder and bytes from Index. ST251/ST252 Media Defect Specification There will be no more than forty-two (42) defects total per drive. Cylinders 0,1 and 2 are defect free. ST277R/ST278R Media Defect Specification There will be no more than sixty-five (65) defects total per drive. Cylinders 0 and 1 are defect free. Read/write Head Parking ----------------------- The ST251, ST252, ST277R and ST278R automatically park the read/ write heads in the shipping zone at power-down. All portions of the read/write heads park inboard of the maximum data cylinder. When power is applied, the heads will recalibrate to Track 0. The heads may also be parked by issung a seek command to any cylinder between 820 and 910 inclusive. When the heads are parked in this manner (with power continuously applied) and step pulses are subsequently issued, the drive will recalibrate to Track 0. Recording Method ---------------- The ST251 and ST252 are designed for operation with the ST412 interface with MFM encoding at 5.0 Mbits/sec. data transfer rate. Operation of an MFM drive with an RLL controller is not approved by Seagate and will void the drive warranty. The ST277R and ST278R are designed to operate with the ST412 Inter- face with Run Length Limited (2,7) encoding at 7.5 Mbits/sec. data transfer rate. UL/CSA Listing -------------- The drives are listed in accordance with UL 478 and CSA C22.2 (0-M1982), and meets all applicable sections if IEC 380 and VDE 0806/08.81, as tested by TUV-Rheinland, North America. Reliability ----------- MTBF ST251, ST252 100.000 POH ST277R, ST278R 70.000 POH PM: Not required MTTR: 30 Minutes Service Life: 5 Years P C - D I S K The Harddisk Information Database DCI AG, Germany www.pc-disk.de ********************************************************************** G E N E R A L ********************************************************************** SEAGATE ST412 MFM/RLL ST412 Interface (MFM and RLL) =================================================================== ST412 Interface (MFM and RLL) ST-506 was predecessor without buffered seek 2 Cables: 1 each 34-pin Command Cable and 1 each 20-pin Data Cable ------------------------------------------------------------------- Command Cable Description J1 (34-pin Command) Host/Drive Pin Assignments GROUND RTN SIGNAL PIN SIGNAL PIN _____________________________________________________ 3 1 2 -HEAD SELECT 2 2 3 4 -HEAD SELECT 2 5 6 -WRITE GATE 7 8* -SEEK COMPLETE 9 10* -TRACK 0 11 12* -WRITE FAULT 0 13 14 -HEAD SELECT 2 15 16 -RESERVED 1 17 18 -HEAD SELECT 2 19 20* -INDEX 21 22* -READY 23 24 -STEP 25 (29)** 26 (28) -DRIVE SELECT 1 (2) 27 (27) 28 (26) -DRIVE SELECT 2 (1) 29 (25) 30 -DRIVE SELECT 3 31 32 -DRIVE SELECT 4 33 34 -DIRECTION IN * STATUS ENABLED WITH DRIVE SELECT ** TWISTED CABLE IN PARENTHESES J2 (20-pin Data) HOST/DRIVE PIN ASSIGNMENTS GROUND RTN SIGNAL PIN SIGNAL NAME PIN _____________________________________________________________ 2 1 -DRIVE SELECTED 4 3 RESERVED 6 5 RESERVED 8 7 RESERVED 10 9 RESERVED 12 11 GROUND 13 +MFM (RLL) WRITE DATA 14 -MFM (RLL) WRITE DATA 16 15 GROUND 17 +MFM (RLL) READ DATA 18 -MFM (RLL) READ DATA 20 19 GROUND Seagate Technology Desk Reference July 17 2000