
C F S - 4 2 5 A                 C A B O    CONNER
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders    3687|  826|     |
Capacity form/unform   425/      MB        Heads           2|   16|     |
Seek time   / track  15.0/ 3.0 ms          Sector/track     |   63|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation   826
Cache/Buffer            64 KB SEGMENTED    Landing Zone
Data transfer rate          MB/S int       Bytes/Sector      512
                     13.000 MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 60
Power: sleep          1.0 W     Humidity     %         8 80    |      8 80
       standby        1.0 W     Altitude    km    -0.061  3.048| -0.061 12.192
       idle           3.8 W     Shock        g         5       |     75
       seek           5.7 W     Rotation   RPM      3600
       read/write     4.9 W     Acoustic   dBA        34
       spin-up            W     ECC        Bit
                                MTBF         h     250000
                                Warranty Month
Lift/Lock/Park     YES          Certificates


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CONNER   CFS-425A  QUICK REFERENCE GUIDE REV. C, 12/1994

  +---------------------------------------------------------+
  |                                                         |XXI
  |                                                         |XXN
  |                                                         |XXT 40PIN
  |                                                         |XXE
  |                                                         |XXR
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
  |                                                         |XXE
  |                                                         |XX
  |                                                         |XX
  ++-+C/D                                                   |
  ++ |                                                      |XX J2
  ++ |C/S                                                   |xx Power
  ++ |                                                      |XX
  ++-+                                                      |XX J6
  +---------------------------------------------------------+   Power



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CONNER   CFS-425A  QUICK REFERENCE GUIDE REV. C, 12/1994

 Jumper Setting
 ==============

 The C/D jumper is used to determine whether the drive is a master
 (drive C) or a slave (drive D). The drive is configured as a master,
 when jumpered, and a slave when not jumpered.


 Master/Standalone
 -----------------
  C/D A/C CS
    x  o  o      C/D CLOSED
    X  o  o


 Slave
 -----
 C/D A/C CS
    o  o  o      All OPEN
    o  o  o


 Cable Select Master or Slave
 ----------------------------
 C/D A/C CS
    o  o  x      CS CLOSED
    o  o  X


 Master/Slave Configuration
 --------------------------
 When two drives are daisy-chained on the host interface, one must be
 designated as the master drive (C: drive) and one as the slave drive
 (D: drive).

 Commands from the host are written in parallel to both drives.

 When the C/D jumper on the drive is closed, the drive will assume the
 role of a master. When C/D is open, the drive will act as a slave. In
 single-drive configurations, C/D must remain in the closed (master)
 position.

 For each command sent from the host, the DRV bit in the drive/head
 register selects the master or the slave drive. When the DRV bit is
 reset (0), the master drive is selected, and when the DRV bit is set
 (1), the slave drive is selected. Once the drives receive the
 command, only the drive with jumper C/D set to the appropriate
 position will execute the command. For example, if the DRV bit is
 set, only the slave drive (jumper C/D open) will execute the command.

 Note: If the command is a diagnostic command, both drives will
 execute the command and the slave will report its status to the
 master via the Host PDIAG signal.

 Throughout this manual, drive selection always refers to the state of
 the DRV bit and the position of the C/D jumper.


 Cable Select
 ------------
 This optional method of drive Master/Slave designation can be enabled
 by jumper selection. If used, special cabling can be used
 to selectively ground the CSEL interface signal of the drive intended
 to be drive C (0). This drive will then function as the Master. If
 CSEL is allowed to float the drive will recognize itself as drive D
 (1) and function as the Slave.


 -HOST PDIAG Pin 34
 This signal shall be asserted by the slave to the master that it
 has completed diagnostics. A 10K ohm pull-up resistor shall be
 used on this signal by each drive. Following a POR, a software reset,
 or a RESET-, the slave will negate PDIAG- within 1 ms (to indicate to
 the master that it is busy). The slave will then assert PDIAG- within
 30 seconds to indicate that it is no longer busy and is able to
 provide status.

 After the assertion of PDIAG-, the slave may be unable to
 accept commands until it has finished its reset procedure and is
 ready (DRDY =1).

 Following the receipt of a valid Execute Device Diagnostics
 command, the slave will negate PDIAG- within 1 ms to indicate
 to the master that it is busy and has not yet passed its drive
 diagnostics. If the slave is present, then the master will wait for
 up to 5 seconds from the receipt of a valid Execute Device
 Diagnostics s command for the slave to assert PDIAG-. The
 slave should clear BSY before asserting PDIAG-, as PDIAG- is
 used to indicate that the slave has passed its diagnostics and is
 ready to post status.

 If DASP- was not asserted by the slave during reset initialization,
 the master will post its own status immediately after it completed
 diagnostics and clear the slave status register to 00 hex. The master
 may be unable to accept commands until it has finished its reset
 procedure and is Ready (DRDY = 1).

 -DASP Pin 39
 DASP- (drive active/slave present). This is a time-multiplexed
 signal which indicates that a drive is active, or that the slave is
 present. This signal is an open-collector output and each drive
 has a 10K pull-up resistor. During power-on initialization or after
 RESET is negated, DASP- shall be asserted by the slave within 400 ms
 to indicate that the slave is present.

 The master shall allow up to 450 ms for the slave to assert DASP-. If
 the slave is not present, the master may assert DASP- to drive an
 activity LED.

 DASP- shall be negated following acceptance of the first valid
 command by drive 1 or after 31 seconds, whichever comes first.
 Any time after negation of DASP-, either drive may assert DASP- to
 indicate that a drive is active.



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CONNER   CFS-425A  QUICK REFERENCE GUIDE REV. C, 12/1994

 Notes on Installation
 =====================

 Installation direction
 ----------------------

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 The drive will operate in all axis (6 directions).

 Mounting the Drive
 ------------------
 You can mount the drive either vertically or horizontally. The drive
 will meet all performance specifications when mounted at any
 orientation.

 Caution: The surface(s) on which you mount the drive should be
 flat and parallel to prevent uneven pressure on the drive.
 Mounting the drive on an uneven surface could cause the drive's
 base to deform, degrading drive performance.

 Caution: When using the side mounting holes, verify the screw
 length to ensure clearance from the drive's printed circuit board
 before tightening the screw.


 J6 Standard 4-pin Power Connector
 ---------------------------------
 +-----------------------
 | +-----J6-----+ +----   pin 1  +12V
 | | 1  2  3  4 | | 1     pin 2   GND
 | +------------+ +--     pin 3   GND
 +------------------      pin 4   +5V


 J2 Optional 3-pin Power Connector
 ---------------------------------
 +------------------------------
 | +-----J6-----+ +--J2---+ +---   pin 1  +5 V
 | | 1  2  3  4 | | 1 2 3 | | 1    pin 2  +12V
 | +------------+ +-------+ +----  pin 3   GND
 +----------------------------------


 Mounting Holes
 --------------
 Side:   6-32 UNC-2B .16 max. insertion
 Bottom: 6-32 UNC-2B .22 max. insertion


 Brushless DC
 ------------
 A brushless DC direct-drive motor assembly is mounted on the drive's
 base. The motor rotates the drive's spindle at 3600 RPM. The
 motor/spindle assembly is dynamically balanced to provide minimal
 mechanical runout to the disks. A dynamic brake is used to provide a
 fast stop to the spindle motor and return the heads to the landing
 zone when power is removed.


 Head Positioning Mechanism
 --------------------------
 The read/write heads are supported by a mechanism coupled to a rotary
 voice coil actuator.


 Read/Write Heads and Disks
 --------------------------
 Data is recorded on a 95mm diameter disk using 3350-type Metal In Gap
 (MIG) and/or Thin Film composite heads.

 The CFS425A contains:

 - one disk with two data surfaces

 - two read/write heads

 At power-down, the heads are automatically retracted to the inner
 diameter of the disk and are latched and parked on a landing zone
 that is separate from the data tracks.

 The drive has a single 40-pin data connector, as well as an auxiliary
 connector which is reserved for factory or evaluation use.

 The drive has two power connectors, only one of which should be used
 at a time.

 The two connectors provide connection versatility to a number of host
 systems.

 The mating connector for the 4 pin connector is AMP 1-480424-0
 (housing) and AMP 60619-4 (loose piece) or 61117-4 (strip) contacts.



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CONNER   CFS-425A PRODUCT GUIDE

 The drive assembly housing consists of an extruded aluminum base on
 which is mounted a drawn aluminum cover. In addition, the aluminum
 cover has a designed in breather filter and diffusion tube that
 prevents entry of contaminants which might degrade head and media
 reliability. Aluminum tape seals the joint between the base and
 cover. Critical drive components are contained within this
 contaminant-free environment, which is commonly referred to as the
 Head-Disk Assembly (HDA).


 Safety Standards
 ----------------
 The drive is designed to comply with relevant product safety
 standards, including:

 - UL 478, 5th edition, Standard for Safety of Information Processing
   and Business Equipment

 - UL 1950, Standard for Safety of Information Technology Equipment

 - CSA 22.2 #220, Information Processing and Business Equipment

 - CSA 22.2 #950, Safety of Information Technology Equipment

 - IEC 380, Safety of Electrically Energized Office Machines

 - IEC 950, Safety of information Technology Equipment Including
   Electrical Business Equipment

 - VDE 0805, VDE 0805 TIEL 100, and VDE 0806

 - Complies with FCC Class B, Part 15, Subpart J


 Error Correction
 ----------------
 The drive uses a Reed-Solomon code to perform error detection and
 correction.

 For each 512-byte block, the software error correction polynomial is
 capable of correcting:
 - one error burst up to 22 bits

 - two error bursts up to 11 bits each Single bursts of 11 bits or
   less are corrected on the fly (OTF) with no performance
   degradation.


 Conner has established a Universal Translate Mode which enables you
 to configure the drive in an AT environment to any cylinder, head,
 and sector configuration desired. The translate configuration is
 limited by the maximum capacity of the drive and host system
 parameters. Upon initial power-up of the drive, it will default to
 the configuration.


 Signal Levels
 -------------
 All signal levels are TTL compatible. A logic "1" is >2.0 Volts. A
 logic "0" is from 0.00 Volts to 0.70 Volts.


 Execute Device Diagnostics
 --------------------------
 Command Number: 90 hex
 Description: This command performs the internal diagnostic tests
 implemented by the drive. The diagnostic tests are only executed upon
 receipt of this command.

 The drive sets BSY immediately upon receipt of the command. If the
 drive is a master, the drive performs the diagnostic tests and saves
 the results. It then checks to see if a slave drive is present and
 waits up to 5 seconds for the slave to complete its diagnostics. If
 the slave successfully completes its diagnostics, it asserts -HOST
 PDIAG. If unsuccessful, the master drive resets BSY in the Status
 register and generates an interrupt. The Error bit (ERR) is set in
 the Status register and the Error register is updated.
 The value in the Error register should be viewed as a unique 8-bit
 code and not as the single-bit flags defined previously. The
 interface registers are set to initial values except for the Error
 register.

 Error Code
 01 hex No error detected
 02 hex Format device error
 03 hex Sector buffer error
 8x hex Slave drive failed

 Additional codes may be implemented at the manufacturer's option.

 Note: If the slave drive fails diagnostics, the master drive
 shall "OR" 80 hex with its own status and load that code into the
 Error register. If the slave drive passes diagnostics or there is no
 slave drive connected, the master drive shall set bit 7 of the Error
 register in the Task File to 0.


