
S T 3 8 5 1 A                   C A B O    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders        | 1651|     |
Capacity form/unform   850/      MB        Heads           4|   16|     |
Seek time   / track  14.0/ 3.0 ms          Sector/track     |   63|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer            64 KB SEGMENTABLE  Landing Zone
Data transfer rate    3.000 MB/S int       Bytes/Sector      512
                     16.600 MB/S ext DMA2
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           3.5 W     Shock        g         5       |     75
       seek           5.5 W     Rotation   RPM      3600
       read/write     4.0 W     Acoustic   dBA        38
       spin-up            W     ECC        Bit   ON THE FLY,REED SOLOMON
                                MTBF         h     300000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,IEC950,UL19...


**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
CONNER   CFS-850A  QUICK REFERENCE GUIDE DEC. 94 REV. C

  +---------------------------------------------------------+
  | +-+                                                     |XXJ4
  | | |HDA                                                  |xx1 Power
  | | |                                                     |XXJ2
  | | |                                                     |XX
  | +-+                                                     |XXI
  |                                                         |XXN
  |                                                         |XXT
  |                                                         |XXE
  |                                                         |XXR
  |                                                         |XXF
  |                                                         |XXA
  |+-+C/D                                                   |XXC
  || |ATA/ISA                                               |XXE
  || |CS                                                    |  1
  || |                                                      |XXJ6
  |+-+                                                      |XX Power
  +---------------------------------------------------------+  1



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
CONNER   CFS-850A  QUICK REFERENCE GUIDE DEC. 94, REV. C

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

 The C/D Jumper is used to determine 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.

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


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


  C/D A/C CS
   o   x   o   Slave
   o   X   o



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                      I   N   S   T   A   L   L
**********************************************************************
CONNER   CFS-850A  QUICK REFERENCE GUIDE DEC. 94, REV. C

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

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

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

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


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


 J4 Optional 3-pin Power Connector
 ---------------------------------
 +------------------------------
 | +---J4----+ +-------------   pin 1  +5 V
 | | 3  2  1 | | 40             pin 2  +12V
 | +---------+ +--------------  pin 3   GND
 +----------------------------------


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



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
CONNER   CFS-635A/850A/1275A  PRODUCT MANUAL 20401006-001 REV. A  7/95

 Overview of the Drives
 ----------------------
 The Conner Filepro Series CFS635A/CFS850A and CFS1275A are enhanced
 IDE, low-profile hard disk drives that are designed to operate with
 an IBM PC/AT or equivalent host computer system in translate mode.

 The drive provides these features:

 - Can be installed in a wide range of host systems

 - Task File emulation and ATA compatibility allows installation
   in a wide range of host systems

 - High performance rotary voice coil actuator with embedded servoing
   eliminate the need for T-cal

 - 1/7 Run length limited code

 - High shock resistance

 - Sealed HDA

 - Automatic actuator latch against inner stop upon power-down

 - Microprocessor-controlled diagnostics routines that are auto-
   matically executed at start-up.

 - 64 segmentable cache buffer

 - Read Look Ahead and selectable Write Caching

 - Automatic error correction and retries, ECC on the fly

 - supports ATA Standard PIO Mode 4 and DMA Mode 2

 - Block size 512 bytes

 - supports both CHS and LBA addressing

 - Allows daisy-chaining up to two drives on the AT interface

 - Auto-Translate (Universal Translate)

 - 4-byte ECC diagnostic check in read/write


 Firmware
 --------
 The drive's firmware includes a command set which the host uses to
 control the drive. The command set allows the host to request the
 following types of actions:

 - report drive status

 - seek a specific point on the disk

 - read and write data


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

          Cylinders        Heads       Sectors
 CFS635A    1238            16           63
 CFS850A    1651            16           63
 CFS1275A   2477            16           63

 After the drive is ready, the host system may issue INIT DRIVE PARMS
 COMMAND (command code 91hex) to alter the translate configuration
 (number of heads and number of sectors per track). The drive will
 then:

 - calculate the total number of available logical tracks based upon
   the entered sector and head values

 - save the drive parameters in non-volatile memory for subsequent
   drive operations


 Seek Times
 ----------

       +----------------------------------+--------+
       |         track to track      max. |   3 ms |
       +----------------------------------+--------+
       |               Average msec.      |  14    |
       |               Average msec. max. |  26    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+

       The timing is measured through the interface with the drive
       operating at nominal DC input voltages. The timing also assumes
       that:
             - BIOS and PC system hardware dependency have been
               subtracted from timing measurements.


       The average seek time is determined by averaging the seek time
       for a minimum of 1000 seeks of random length over the surface
       of the disk.


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


 Task File Interface Signal Connector Pin 28
 -------------------------------------------
 Pin 28 Cable Select (I/O)
 Cable Select is functional when the C/S jumper is inserted, which
 routes the C/D select to this pin. When set high, drive D: is
 selelcted; when set low, drive C: is selected.


 Error Correction
 ----------------
 The drives use a Reed-Solomon code to perform error detection and
 correction. For each 512-byte block, the software error correction
 polynominal is capable of correcting:

 - one error burst up to 22 bits

 - two error burst up to 11 bits each

 Single bursts of 11 bits or less are corrected on the fly (OTF) with
 no performance degradation.


 Execute Drive Diagnostic
 ------------------------
 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 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 diagostics, 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 inter-
 face registers are set to initial values except for the Error
 register.

 The table below details the codes in the Error register and a
 corresponding explanation.

 Error Code    Description
 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 diaagnostics or there is no slave drive
 connected, the master drive shall sect bit 7 of the Error register
 Task File to 0.


 Reliability
 -----------
 MTBF                     300,000 hours POH
 MTTR                     10 minutes typical
 Preventive Maintenance   None
 Component Design Life    5 years
 Start/Stop Cycles        40,000 minimum


 Safety Standard
 ---------------
 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, and UL 1950, Standard for Safety of
   Information Technology Equipment

 - CSA 22.2#220, Information Processing and Business Equipment,
   CSA 22.2#950, Safety of Electrically Energized Office Machines

 - IEC 380, Safety of Electrically Energized Office Machines, and
   IEC 950, Safety of Information Technology Equipment Including
   Electrical Business Equipment

 - VDE 0805, VDE 0805 TIEL 100, VDE 0806

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


