N D - 1 2 4 0 S NEWBURY DATA
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 2389| | |
Capacity form/unform 1240/ 1524 MB Heads 15| | |
Seek time / track 8.5/ 1.8 ms Sector/track | | |
Controller SCSI2 SINGLE-ENDED Precompensation
Cache/Buffer 256 KB Landing Zone
Data transfer rate MB/S int Bytes/Sector 512
10.000 MB/S ext SYNC
Recording method RLL 1/7 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 55 | -40 65
Power: sleep W Humidity % 5 95 | 5 95
standby W Altitude km -0.305 3.048| -0.305 3.048
idle W Shock g 3 | 50
seek W Rotation RPM 6300
read/write 21.0 W Acoustic dBA 35
spin-up W ECC Bit 88,REED SOLOMON
MTBF h 300000
Warranty Month 24
Lift/Lock/Park YES Certificates CSA,FCC,IEC380,IEC950,TUV,...
**********************************************************************
L A Y O U T
**********************************************************************
MAXTOR MXT-1240S OEM TECHNICAL MANUAL 1028044 REV. A
+---------------------------------------------------------+
| JP5+--+ +-+JP4 +-----+J7 JP8 |XX
| | | +-+ 1-----+ +---+ ++ |XX
|+-+ +--1 +---+ || |XX
|| |J4 RN2|| |XX
|+-+ || |XX
|+-+ +--+JP2 +1 |XX J1
|| | +--1 ++ |XX
|| |J2 RN1|| |XX
|| | || |XX
|| | +-+JP1 || |XX
|| | +-+ +1 |XX
|+-+ +J6----+ |XX
| 1------+ |XX
| +-+ |X1
| | |J5 |
| +-+ |XX Power
| |XX
+---------------------------------------------------------+
Tailgate PCB for Differential SCSI
/--------------DRIVE-------------------------------------
/ / |
/ / |
+--------------------------------------------------------+ |
| XXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX | |
| 4 Pin male DC Male SCSI on Drive PCB | |
| connector on Drive PCB | |
| +-------------------------------------------+ | |
4 female DC connector +----------------------------+Female|SCSI on
XXXXXXXXX | +----------------------------+back side of |
| | | | | tailgate PCB |
+--+-+-+-+----+ | | /
| ++-+-+-++ | | /
| +-------+ +---JP1 | |/
| | |SCSI ID +-+
| +---+ |
| |
| |
| J4 J3 |
| XXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX |
+---------------------------------------------------------+
Male Connector Male SCSI Connector to SCSI Bus
for Power Supply
**********************************************************************
J U M P E R S
**********************************************************************
MAXTOR MXT-1240S OEM TECHNICAL MANUAL 1028044 REV. A
Jumper setting
==============
x = Jumper set at factory
J3 Power Connector
-------------------
----+------------+ pin 1 +12 VDC
| 4 3 2 1 | pin 2 +12 Volts Return
----+------------+ pin 3 + 5 Volts Return
pin 4 + 5 VDC
J4 Service Connector Pin Assignment
------------------------------------
----+------+------+------+------+------+---PCB
|Pin 2 |Pin 4 |Pin 6 |Pin 8 |Pin 10|
|CNMI |DTR |GND |SPDL |-LED |
| | | |Pu.REF|DRV |
+------+------+------+------+------+
|Pin 1 |Pin 3 |Pin 5 |Pin 7 |Pin 9 |
|GND |DTX |GND |N/C |+ 5V |
| | | | | |
+------+------+------+------+------+
When an LED is connected to pins nine and ten, it functions in the
same manner as the LED which is mounted on the disk drive's face-
plate. This is typically used in cases when the drive is mounted in a
position where the LED is not visible or the faceplate is removed.
Pins three (transmit data, DTX) and four (receive data, DTR) are the
main communication lines. Pin two is for factory use only. Pins five
and six are signal ground lines. Pin eigth is used to synchronize the
spindles in multiple drive applications.
J6 SCSI ID Setting
-------------------
+----------+
| 9 7 5 3 1|
|10 8 6 4 2|
+----------+
+--------+----------+-------+-------+-------+
|SCSI ID | Priority | 5 & 6 | 3 & 4 | 1 & 2 |
+--------+----------+-------+-------+-------+
| 0 | Lowest |OPEN |OPEN |OPEN |
| 1 | . |OPEN |OPEN |CLOSED |
| 2 | . |OPEN |CLOSED |OPEN |
| 3 | . |OPEN |CLOSED |CLOSED |
| 4 | . |CLOSED |OPEN |OPEN |
| 5 | . |CLOSED |OPEN |CLOSED |
|x 6 | . |CLOSED |CLOSED |OPEN |
| 7 | Highest |CLOSED |CLOSED |CLOSED |
+--------+----------+-------+-------+-------+
(MSB) (LSB)
SCSI ID jumpers (pins one through six on J6) are provided to con-
figure each disk drve with a SCSI device ID for use in multiple SCSI
device configurations.
An ID of seven is the highest priority in a multiple device
configuration, and is usually used by the initiator.
The disk drive is shipped from the factory with an ID of six. This
assures that sufficient jumpers are available for any address except
seven, which is usually reserved for the host system.
J6 Parity
---------
x 7-8 CLOSED Enables Parity detection
OPEN Disables Parity detection
Parity detection can be disabled by removing the jumper from pins
seven and eight of J6. Odd parity detection is incorporated by the
disk drive. Odd parity is always generated.
J6 Drive Spin-Up Options (spin with power)
-------------------------------------------
x 9-10 CLOSED Start when power is applied
OPEN Wait for START Command
Wait for START Command: With no jumper pins nine and ten of J6, the
disk drive does not spin up until the initiator issues a START/STOP
UNIT (1Bh) command with the start bit set to one.
Start When Power is Applied: When pins nine and ten of J6 are
jumpered, the motor starts as soon as power is applied. The disk
drive is shipped in this configuration.
J7 Single Ended or Differential
--------------------------------
Single Ended Differential
+---+ +---+
12|o o|11 12|xxx|11
10|o o|9 10|xxx|9
8|o o|7 8|xxx|7
6|o o|5 6|xxx|5
4|xxx|3 4|o o|3
2|o o|1 2|xxx|1
+---+ +---+
xxx = CLOSED
The SCSI bus signals may be either single ended or differential. If a
single ended signal is desired, configure J7 so that pins 3 and 4 are
jumpered and all other pins are not.
JP1 +-----------------+ SCSI ID on Tailgate PCB, Differential
|6 o o 5 (MSB)|
|4 o o 3 |
|2 o o 1 (LSB)|
+-----------------+
If a differential signal is desired, an optional "tailgate" PCB must
be added to the drive. The tailgate PCB must have JP1 configured
for the same ID as the disk drive. Additionally J7 (drive PCB) must
have jumpers on pins 1 and 2, 5 and 6, 7 and 8, 9 and 10, and 11 and
12, while pins 3 and 4 should not have a jumper.
JP2/JP4/JP5 Test
-----------------
JP2, JP4 and JP5 are used during the manufacturing process for
testing. After testing, the disk drive is shipped with JP4, the
write protect jumper, installed, which write enables the drive.
Removal of this jumper write protects the drive.
JP8 Terminator Power Selection
-------------------------------
x CLOSED Terminator Power to the SCSI bus is protected by a fuse
(1A) installed on the PCB.
OPEN The drive is prevented from supplying termination power
to the SCSI bus.
Power to the terminators may come internally from the disk drive or
externally from the SCSI bus.
The drive electronics are capable of sensing if the host is providing
power to the terminators. If the host is not providing power, the
disk drive automatically provides power to the terminators via a
regulated (active) power source.
The function of JP8 is the same for the single ended and differential
versions.
**********************************************************************
I N S T A L L
**********************************************************************
MAXTOR MXT-1240S OEM TECHNICAL MANUAL 1028044
Notes of Installation
=====================
Installation direction
----------------------
horizontally vertically
+-----------------+ +--+ +--+
| | | +-----+ +-----+ |
| | | | | | | |
+-+-----------------+-+ | | | | | |
+---------------------+ | | | | | |
| | | | | |
| | | | | |
+---------------------+ | +-----+ +-----+ |
+-+-----------------+-+ +--+ +--+
| |
| |
+-----------------+
The drive will operate in all axis (6 directions).
Drive Orientation
-----------------
The drives may be mounted on any axis. Certain switching power
supplies may emanate electrical noise, which can degrade the
specified read error rate. For best results, orient the drives so
that the PCB assemblies are not adjacent to these noise sources.
Twelve mounting holes, four on the bottom and four on each side, are
provided for mounting each disk into an enclosure. The size and
location of these holes are identical industry standards.
Caution: Mounting screw lengths must be chosen so that no more than
0.125 inch of the screw is available to enter the frame mounting
hole. The PCB must have clearance. The torque applied to the mounting
screws should be between 4 and 6 inchpounds.
Air Flow Requirements
---------------------
It is recommended that air flow over the PCB have a minimum velocity
of 3.6 feet (1.1 meters) per second.
Air Filtration System
---------------------
The disks and read/write heads are assembled in a Class 100 environ-
ment and then sealed within the HDA. The HDA contains an absolute
filter, mounted inside the casing, to provide internal air
filtration.
Initiator-Target Configurations
-------------------------------
The SCSI interface offers a number of unique advantages which
facilitate the interconnection of the disk drive with one (or more)
computer systems. Unlike traditional microcomputer disk interfaces,
such as ST506 or ESDI, SCSI supports multiple peripherals and
different peripheral types, all operating on the same bus structure.
Single Host, Single Device
--------------------------
+------------+ +-----------+
| HOST x+-----------xxxx------------+x SCSI |
| SYSTEM +-----------xxxx------------+x DEVICE |
+------------+ 50-Pin +|----------+
Ribbon Cable | Terminator packs
Multiple Host, Multiple Device
(Single Ended Version)
------------------------------
+------------+ +-----------+
| HOST x+---------------------------+* SCSI |
| SYSTEM +--+ +------------------+ +-+* DEVICE 1|
+------------+ | | | | +|----------+
| | | | | Terminator packs
| | | | Removed
| | | |
+------------+ | | | | +-----------+
| HOST x+--+ | | +-+* SCSI |
| SYSTEM +----+ | +-+* DEVICE 2|
+------------+ | | +|----------+
| | | Terminator packs
| | Removed
| |
| | +-----------+
| +-+x SCSI |
+---+x DEVICE 3|
+|----------+
| Terminator packs
Installed
The MXT-1240S also supports multiple initiator configurations
consistent with the established arbitration cycle outlined in the
SCSI standards. Configuration changes are made by SCSI address
jumpers, which are set when the drive is installed in the system.
The SCSI implementation used in the disk drive is intended to
facilitate high-speed data transfers between the initiator and the
drive. Interconnection between the initiator system(s) and the drive
is via a fifty-pin ribbon cable. The drive may be configured as
either single ended or differential.
Interface Termination
---------------------
Single Ended
SCSI devicesrequire proper interface termination. The first physical
device and the last physical device on a SCSI bus daisy chain must be
terminated. Remove the terminators from any devices in between. For
instance, if a disk drive is in the middle of a SCSI bus daisy chain,
remove its terminators.
The terminator resistor pack's pin one is marked with a dot, or other
suitable marking, on the terminator. Note that the PCB's hole for pin
one has a square outline. Also, note that pin one is always the
closest pin to the power connector, J3.
Note: Both terminator packs (RN1 and RN2) must be oriented with the
dot (pin one) toward J3 for the disk drive to work properly.
As shipped, the interface signal lines are terminated with two re-
movable 1000 ohm resistor network packs supplied with an active
voltage source of 2.85 volts. Resistor tolerances in the terminator
network should be 5% or less.
The devices driving the dis drive inputs should be open collector
devices capable of sinking at least 48 milliamps at a voltage level
of less than 0.5 volts DC (7438 or equivalent).
Devices receiving the disk drive outputs should be of a SCHMITT
trigger type to improve noise immunity (74LS14, 74LS240, or
equivalent). The initiator should not load the bus with more than one
standard low power Schottky transistor-transistor logic (LSTTL) load
per input line, and should terminate all input signals with 100 ohm
terminators with a regulated 2.85 volt power source.
Differential
With the installation of the optional "tailgate" PCB, RN1 and RN2
must be changed from the factory installed 110 ohm value to a higher,
1,000 ohm value.
Note: The RN1 and RN2 terminator packs are "ultra-low profile"
(maximum 3.5mm). Suggested vendors and part numbers are:
1) Panasonic EXBU10E102G and
2) Kyocera TRDSA10PC102GA.
Spindle Synchronization
-----------------------
The MXT-1240S disk drives are able to synchronize their spindles
together for use in disk drive arrays. This is accomplished by having
all drives in the array synchronized to a common pulsed index signal.
This synchronous signal can be provided by either an external source
or a master drive and can be transceived on the service connector
(J4 pin 8).
If the sync pulses are to be supplied by a drive, only one drive in
an array may transmit it. All other drives will receive the sync
pulses and synchronize their index pulses to it.
The configuration for the synchronized-spindle bus is a twisted pair
cable, daisy-chained from the master to each slave drive. This
twisted pair cable is connected to the Service Connetor (J4) on each
drive. The mating connector is a Dupont part number 69764-010 or Berg
part number 6976410.
The number of drives that can be attached to the array depends on the
length of the bus connecting each drive to the source of the sync
signal and the amount of current supplied by the terminating
resistor. If the MXT-1240S drive is the signal source, it can sink
15 mA. The maximum cable length is 3 meters.
The source of the reference pulse must be at the far end of the
transmission line, opposite the 2K ohm terminating resistor, which is
between the signal and +5V.
Note: The terminating resistor must be supplied by the user as part
of the cable.
System Cabling With One Drive in Master Mode
--------------------------------------------
+OPTIONAL-+ +---------+ +---------+ +---------+ +---------+
|External | |Disk | |Disk | |Disk | |Disk |
|Pulse | |Drive | |Drive | |Drive | |Drive |
|Source | |MASTER | | | | | | |
+ + - - + + +-+-----+-+ +-+-----+-+ +-+-----+-+ +-+-----+-+
+ - - + +6-8-9+ +6-8-9+ +6-8-9+ +6-8-9+
| | | | | | | | | | 2K
| + - - - -+ o---------+-o----SPDL-+-o---------+-o-
+ - - - - - o--Twisted--o-pair------o-cable--GND+
After power is reset, the drive will be in an independent spindle
mode, not configured for either a MASTER or SLAVE mode. Each drive
must be configured for the appropriate mode of operation. This
configuration is accomplished via a MODE SELECT command with Page 04h
setting the RPL bits in byte 17, bits 0 and 1. The master drive will
generate the spindle-synchronization sync pulses with the slave
drives to receive the sync pulses. The connection between drives for
the sync reference pulse, is a bi-directional line. The master can be
either the host, a drive, or an external signal source which
generates the sync reference pulse.
J1 SCSI Connector
------------------
The MXT-1240S communicates with an initiator system via a fifty-pin
connector, J1. Pin one is located on the end of J1 closest to the DC
power connector, J3.
J3 Power Connector
------------------
The four-pin DC power connector J3, is similar to AMP's MATE-N-LOCK
connector part number 350543-1. J3 however, is surface mounted to the
PCB rather than freehanging as the AMP part is. The recommended
socket housing that is compatible with connector J3 is AMP part
number 1-480424-0. The recommended female sockets that are compatible
with connector J3 are AMP socket part numbers 350078-4 (strip) or
61173-4 (loose piece).
J4 Service Connector
--------------------
Connector J4 is a 10-pin service connector provided for serial input,
the synchronous spindle, and LED source current. Its mating
connector is a Berg 6976410 part.
**********************************************************************
F E A T U R E S
**********************************************************************
MAXTOR MXT-1240S OEM TECHNICAL MANUAL 1028044 REV. A
Drive Mechanism
---------------
The HDA is a sealed subassembly containing the mechanical portion of
the disk drive. A brushless DC motor contained within the spindle hub
rotates the spindle and is controlled by a dedicated microprocessor.
Shock mounting is provided internally in the HDA and externally at
vibration isolators to minimize transmission of vibration through the
frame. The frame is the mechanical assembly holding the HDA and PCB.
Sector Size
-----------
The disk drive is shipped from the factory formatted with a default
size of 512 bytes. Sector sizes of 514, 520, and 1,024 bytes are also
supported.
Error Conditions
----------------
When the drive fails to achieve synchronization, a UNIT ATTENTION
condition with an Additional Sense Code (ASC) of 06h with an
Additional Sense Code Qualifier (ASCQ) of 5Ch (RPL status change)
will be posted. Additionally, if subsequent to achieving
synchronization, the drive detects a loss of synchronization and no
I/O operation is beeing executed, a check condition of UNIT ATTENTION
with RPL status change will be posted.
Error Correction
----------------
The MXT-1240S disk drive contains an 88-bit Reed Solomon error
correction code which is non-interleaved. Different than the Maxtor
ECC implementations, this error correction code resides in the hard-
ware within the Cirrus SH-450 SCSI controller IC. This allows for
"in-line" or "on the fly" correction of single burst errors up to 11
bits in length without any mechanical delays or interruption of data.
Additional error correction capability for double burst or greater
than 11-bit errors resides in the firmware or "off-line" and is
invoked as part of the error recovery algorithm.
The 88-bit ECC, both hardware and firmware correction codes, provides
increased error correction capability, thus allowing a significant
improvement in both the recovered and unrecovered error rates along
with a very low miscorrection probability.
Seek Time
---------
|MXT1240S|
----------------------------------+--------+
Single Track Read msec. | <1.5 |
Write msec. | 2.0 |
Average Seek msec. | 8.5 |
To Read msec. | 8.5 |
To Write msec. | 9.5 |
Full Stroke msec. | 20.0 |
Latency msec. avg. | 4.76 |
----------------------------------+--------+
