H M D - 7 5 5 EPSON NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 615| | | Capacity form/unform 21/ MB Heads 2| | | Seek time / track 80.0/18.0 ms Sector/track 34| | | Controller IDE / XT Precompensation Cache/Buffer KB Landing Zone Data transfer rate 0.938 MB/S int Bytes/Sector 512 0.938 MB/S ext Recording method RLL 2/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 4 50 | -40 65 Power: sleep W Humidity % 8 80 | 8 85 standby W Altitude km 3.000| 10.000 idle 10.2 W Shock g 8 | 40 seek W Rotation RPM 2650 read/write W Acoustic dBA 50 spin-up W ECC Bit 32,WITH 11BIT BURST COR MTBF h 20000 Warranty Month Lift/Lock/Park YES Certificates ********************************************************************** L A Y O U T ********************************************************************** EPSON HMD-755/765 PRODUCT MANUAL MK3-705-000-00-REV.0 9/87 +---------------------------------------------------------+ | |XX Power | |XX | | | | | |XX I | |XX N | |XX T J1 | |XX E | |XX R | |XX F | |XX A | |XX C | |XX E | |XX | |XX +---------------------------------------------------------+ ********************************************************************** J U M P E R S ********************************************************************** EPSON HMD-755/765 PRODUCT MANUAL MK3-705-000-00-REV. 0 9/87 Jumper Setting ============== Drive Set Up ------------ In the 2-drive operation, the two drives are assigned Drive 0 or Drive 1 by shunt block SS1. The host accesses Drive 0 via I/O address port 320H through 323H or Drive 1 via I/O address port 324H through 327H. As shipped, Drive 0 is selected. Pin Pair Drive Number when shorted 0 0 1 1 ********************************************************************** I N S T A L L ********************************************************************** EPSON HMD-755/765 PRODUCT MANUAL MK3-705-000-00-REV. 0 Notes on Installation ===================== Installation direction ---------------------- horizontally vertically +-----------------+ +--+ +--+ | | | +-----+ +-----+ | | | | | | | | | +-+-----------------+-+ | | | | | | +---------------------+ | | | | | | | | | | | | x x | | | | | | +------x------x-------+ | +-----+ +-----+ | +-+------x--x-------+-+ +--+ +--+ | xx | | x x | +---x--------x----+ x x There are 5 possible mounting orientations; - Vertical on either side - Horizontal with PCB down Do not mount horizontally with the PCB up! Mounting Screws --------------- There are 8 mounting holes on the mounting frame. The drive will be mounted using UNC *6-32, M-3 or M-4 screws with 3.5 mm (0.14 inches) maximum penetration. Mounting Clearance ------------------ The drive is designed to withstand high level shocks and vibrations. However, to take full advantage of the shock absorbers, it is necessary to provide a clearance of 2.5mm or 0.1 inch on all sides of the drive. This clearance allows for movement of the drive during acceleration and also free air flow for ventilation. Cable Interconnection (2 Drive System) -------------------------------------- Adapter Card +-------------+ | +----------+ | +--+ |Drive 0 | | | | +-+ | | HOST | +---------+ |J1 | | +--+ +-+ | | | +----------+ | | +----------+ | +--+ |Drive 1 | | | | +-+ | | | +---------+ |J1 | | +--+ +-+ | +-------------+ | +----------+ Adapter Card Electrical Interface -------------------- All interface signal lines are TTL compatible and provide signals either to or from the drive via a 40 contact edge connector J1/P1. Note about connector pin 39: This open collector output drives an external LED activity indicator. ********************************************************************** F E A T U R E S ********************************************************************** EPSON HMD-755/765 PRODUCT MANUAL MK3-705-000-00-REV. 0 Introduction ------------ The EPSON HMD-755/765 are 21.4-Megabyte / 42.6-Megabyte intelligent 3.5 inch half height hard disk drive which communicates with a host computer vai IBM-XT Bus. Features: - Drive and controller electronics within the standard 3.5" form factor. - Highly efficient rotary actuator and drive circuits achieve low power consumption. - Thermal off-track compensation achieves 910 tpi with excellent repeatability. - Hardware 32 bit ECC polynomial with up to 11 bit burst correction - Reliability is enhanced by selected parts with 20,000 hours MTBF HMD-755 ------- Read/Write Heads 2** Discs 1** ** Using another Firmware, HMD-755 can keep compatibility with HMD-725 at Read/Write Head and Disc number. (4 Read/Write Heads and 2 Discs.) Seek Time --------- +----------------------------------+--------+ |Track-to-Track msec. typ. | 18 | +----------------------------------+--------+ |Average msec. typ. | 80 | | msec. max. | 150 | +----------------------------------+--------+ |Latency msec. avg. | 11.3 | +----------------------------------+--------+ Media Defect criteria (as shipped from EPSON) --------------------------------------------- Maximum Defects per Logical Head 10 Maximum Defects per Drive 32 Cylinder zero certified Defect Free Reliability ----------- MTBF 20,000 poh Preventive Maintenance none MTTR 30 minutes Component Life 5 years