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Hard Drive: CONNER: CFA-850A 852MB 3.5"/SL ATA2 FAST

C F A - 8 5 0 A    CONNER
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/SLIMLINE         Cylinders        | 1652|     |
Capacity form/unform   852/      MB        Heads           4|   16|     |
Seek time   / track  12.0/ 3.0 ms          Sector/track     |   63|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer           256 KB SEGMENTED    Landing Zone
Data transfer rate    6.000 MB/S int       Bytes/Sector      512
                     16.700 MB/S ext PIO4
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|        12.192
       idle           3.9 W     Shock        g         5       |     75
       seek           5.6 W     Rotation   RPM      4500
       read/write     4.2 W     Acoustic   dBA        39
       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...



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


CONNER CFA-425A/850A/1275A PRODUCT MANUAL P/N 32282-001,REV.A, 1994

Jumper Setting

C/D Master/Slave Configuration
CLOSED Single Drive
CLOSED Master Drive
OPEN Slave Drive

A/C Master/Slave Protocol
CLOSED ATA/CAM master/slave mode
OPEN Conner master/slave mode

CS Cable Select
OPEN Cable select option disabled
CLOSED Cable select option enabled

When using the CS option, the C/D jumper must be open.

Master/Slave Configuration
When two drives are daisy-chained on the host interface, one must be
designated at the master drive (C: drive) and one as the slave drive
(D: drive). Commands from the host are written in parallel to both

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)

To use the cable select option, remove the C/D jumper and place it on
C/S. The C/S option allows M/S configuration to be done by the host

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.

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.

The drive supports two master/slave modes via the A/C jumper. When
A/C is open, ATA/CAM master/slave mode is selected. When A/C is
closed, Conner master/slave mode is selected.

Supported Master/Slave Modes
There are three different master/slave methods that Conner supports.

- ISA Original
- Conner

Of these three methods, the drive supports all except ISA/Original
mode, with which it is compatible.

The ATA/CAM master/slave method is not compatible with the other two
methods. The Conner mode is backward-compatible to the ISA Original
mode, but is not compatible with the other.

These three methods are explained in the following sections. For
signals followed by a ' ', activate means go low and deactivate means
go high.

ISA Original Master/Slave
The signals used for master/slave operation and determination are
Host DASP and Host PDIAG .

Host DASP can be used to:

- drive an activity LED

- indicate that the slave drive is present to the master

The Host PDIAG is used to indicate that the slave has passed
diagnostics both at power-on reset (POR) and when the diagnostic
command is issued.

At power-on time, the slave drive activates Host PDIAG and Host
DASP . Host PDIAG remains activated from POR until a diagnostic
command is issued by the host. Once a diagnostic is issued by the
host, the slave deactivates Host PDIAG until either:

- the slave successfully completes the diagnostic command

- the host issues a reset

There are no real timing constraints on Host PDIAG and Host DASP .
At POR, they are both activated within a second or two. When the
diagnostic command is issued by the host, the slave inactivates Host
PDIAG within 100-200 microseconds and is required to reactivate it
within 5 seconds (the only timing constraint) if it successfully
completes the command.

This scheme works fairly well except for two problems:

 - There is no way to tell when the slave becomes ready. If the slave
   becomes ready much later than the master, the slave will miss any
   command that are issued before it goes not busy because the host
   only polls the master to see if the "controller" is ready.

 - In a two-drive configuration, the Host DASP  line is not available
   to drive a drive activity indicator.

In this mode of master/slave, master/slave re-configures with either
a hardware or software reset. A hardware reset is either a POR or
host reset.

This version of master/slave is present on generations 1, 2, and 3
of Conner drives.

Conner Master/Slave
To remendy the problem of the host not knowing when the slave was
ready, Conner developed a backward-compatible solution, which we call
Conner Master/Slave.

In Conner Master/Slave, the use of the Host PDIAG signal has been
changed slightly during reset so that the slave will indicate when it
will go not busy. Its use in the diagnostic command has not been

During POR or any host reset, the slave drive activates Host PDIAG
within 1ms. The master drive waits slightly longer that 1 ms for
Host PDIAG to be activated before it determines that no slave is
present. The slave then deactivates Host PDIAG when it is ready. The
master waits:

 - up to 14 seconds for the slave to deactivate Host PDIAG on either
   a POR or a host reset

 - 450 ms for the slave to deactivate Host PDIAG  on a host software

If the master times out, it goes not busy.

In this mode of master/slave, master/slave re-configures with either
a hardware or software reset. A hardware reset is either a Power On
Reset (POR) or host bus reset.

This solution was implemented in generations 4 and greater of Conner

ATA/CAM Master/Slave
This industry-standard master/slave solution was developed by the CAM
shortly after the development of the Conner Master/Slave. The
polarity of Host PDIAG is opposite that of the Conner solution and
this is what makes this master/slave scheme incompatible with the
Conner scheme.

At power-on time, the slave deactivates Host PDIAG and then
activates Host DASP within 1 ms of either POR or host reset. Host
DASP activate indicates that a slave is present. The slave
activates Host PDIAG when it is ready to accept commands or after 30
seconds. The drive will inactivate Host DASP when it receives the
first command or after 30 seconds,, whichever occurs first. This
period is reduced to 450ms for a software reset. A hardware reset is
either a POR or host bus reset.

This solution was implemented in generations 4.5 and greater of
Conner drives and is selectable with the A/C jumper or the CAM bit in
the feature word.


CONNER CFA-425A/850A/1275A PRODUCT MANUAL P/N 32282-001,REV.A, 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 orienta-

The surface(s) on which you mount the drive should be flat and
paralled to prevent uneven pressure on the drive. Mounting the drive
on an uneven surface could cause the drive's base to deform, degrad-
ing drive performance.

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

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.

Read/Write Heads and Disks
Data is recorded on 95mm diameter disks through thin film heads.

The CFA425A contains:

- one disk with two data surfaces

- two read/write heads

The CFA850A contains:

- two disks with two data surfaces

- four read/write heads

The CFA1275A contains:

- three data surfaces

- six 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 inside the data tracks.

Data and Power Connections
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 a standard 4-pin power connector and may optionally
have a 3-pin connector, only one of which should be used at a time.

The drive also has a jumper blcok located nect to the auxiliary
connector which can be set to specify drive operational parameters.

Attaching a Data Cable to the Drive
Attach the data cable from the host to the Task File Interface

Do not route the data/power cable next to the drive PCB or any other
high frequency or large current switching signals. Improper drive
operation can result from improper cable routing.

The recommended mating connector for the Task File Interface is
Molex P/N 15-47-5401 or equivalent. You may daisy-chain two drives on
this connector. The maximum cable length is 18 inches.

Power Connector
The drive has a standard 4-pin DC power connector and may have an
optional, smaller, 3-pin connector. Power must only be supplied at
one source.

 4-Pin Power and pin connector assignments
 --+  +------------+|  pin 1    +12 Volts
   |  | 4  3  2  1 ||  pin 2    GND
  -+  +------------+|  pin 3    GND
  ------------------+  pin 4    + 5 Volts

 3-Pin Power and pin connector assignments
 --+  +---------+|  pin 1    + 5 Volts
   |  | 1  2  3 ||  pin 2    +12 Volts
  -+  +---------+|  pin 3    GND

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.

The mating connector for the 3-pin connector is Molex series 54-84
(header), Molex partnumber 39-01-0033 (housing), and terminal part
number 39-00-0031 (loose) or 39-00-0023 (strip).


CONNER CFA-425A/850A/1275A PRODUCT MANUAL P/N 32282-001,REV.A, 1994

Overview of the Drives
The Conner Filepro Advantage CFA425A/CFA850A and CFA1275A are high-
performance, 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:

 - 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.

- 64/256/256KB (respectively) 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

The drive supports either of the following Master/Slave protocol

- ATA/CAM (AT Attachment/Common Access Method)

- ISA/Conner (Industrie-Standard Architecture)

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
 CFA425A     826            16           63
 CFA850A    1652            16           63
 CFA1275A   2479            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

 - 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. read |  11    |
       |               Average msec. write|  11.5  |
       |               Average msec. max. |  26    |
       |Latency                msec. avg. |   6.67 |
       The timing is measured through the interface with the drive
       operating at nominal DC input voltages. The timing also assumes
             - 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 +Spindle Sync/Cable Select (I/O)
 The ATA specification allows this pin to be used for two optional

 - Spindle Sync is a signal used by the drives which are interconnect
   on the same cable to synchronize their spindle rotation with each

 - Cable Select routes the C/D select to this spin. When set high,
   drive D: is selected; when set low, drive C: is selected. This
   function is enabled by placing a jumper on CS.

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

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

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.

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.

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

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