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Hard Drive: CONNER: CFS-1275A (7/1995) 1275MB 3.5"/SL ATA2 FAST

C F S - 1 2 7 5 A   ( 7 / 1 9 9 5 )    CONNER
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/SLIMLINE         Cylinders        | 2477|     |
Capacity form/unform  1275/      MB        Heads           6|   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...


CONNER CFS-635A/850A/1275A PRODUCT MANUAL 20401006-001 REV. A 7/95

  | +-+                                                     |
  | | |                                                     |
  | | |                                                     |XXI
  | +-+                                                     |XXN
  |                                                         |XXT
  |                                                         |XXE 40PIN
  |                                                         |XXR
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
  ++-+C/D                                                   |XXE
  ++ |                                                      |XX
  ++ |C/S                                                   |  1
  || |                                                      |XX
  ++-+                                                      |XX Power


CONNER CFS-635A/850A/1275A PRODUCT MANUAL 20401006-001 REV. A 7/95

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.

  C/D     CS
    x  o  o      C/D CLOSED
    X  o  o

  C/D     CS
    o  o  o      All OPEN
    o  o  o

 Cable Select Master or Slave
  C/D     CS
    o  o  x      CS CLOSED Cable Select Option enabled
    o  o  X

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

All other pins are reserved and should not be used.

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)

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.

Drive selection always refers to the state of the DRV bit in the
Device/Head register and the position of the position of the C/D
jumper throughout this manual.

Cable Select
This optional method of drive master/slave designation can be enabled
by jumper selection as described below. 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 it-
self as drive D (1) and function as the slave.


CONNER CFS-635A/850A/1275A PRODUCT MANUAL 20401006-001 REV. A 7/95

Notes on Installation

Drive mounting

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
                         |  |     | |     |  | ||      x  x      ||
 +---------------------+ |  +-----+ +-----+  | ||       xx       ||
 +-+-----------------+-+ +--+             +--+ ||     x    x     ||
   |                 |                         ||   x        x   ||
   |                 |                         || x            x ||
   +-----------------+                         |x                x|

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 or MIG

The CFS635A contains two disks with three data surfaces and three
read/write heads.

The CFS850A contains:

- two disks with four data surfaces

- four read/write heads

The CFS1275A contains:

- three data surfaces with six 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.

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

 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

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.


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

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

 - 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
             - 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

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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