S T 4 0 3 8 ( 1 9 8 7 ) SEAGATE

(note added 2/15/2015 - you will need to change fonts to get the diagrams to view properly)

S T 4 0 3 8 ( 1 9 8 7 ) SEAGATE

Native| Translation ------+-----+-----+-----

Form 5.25"/FH Cylinders 733| | |

Capacity form/unform 31/ 38 MB Heads 5| | |

Seek time / track 40.0/ 8.0 ms Sector/track 17| | |

Controller MFM / ST412 Precompensation 300

Cache/Buffer KB Landing Zone

Data transfer rate 0.625 MB/S int Bytes/Sector 512 0.625 MB/S ext

Recording method MFM operating | non-operating -------------+--------------

Supply voltage 5/12 V Temperature *C 10 45 | -40 60

Power: sleep W Humidity % 8 80 | 5 90

standby W Altitude km -0.305 3.048| -0.305 9.144

idle 25.5 W Shock g 10 | 35

seek 37.5 W Rotation RPM 3600

read/write W Acoustic dBA

spin-up W ECC Bit MTBF h 12000 Warranty Month Lift/Lock/Park YES Certificates CSA,FCC,IEC380,TUV,UL478,VDE

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L A Y O U T

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SEAGATE ST4038/4051 PRODUCT MANUAL 36038-001, REV. A, 2/5/87

+---------------------------------------------------------+

| |XX | *JP1 |XX J2 | |XX | |XX | 1-+ J10 | | |xx/ | |J9 Frame | +-+ | |XX | |XX J1 | JP2++ +---------+ |XX | 1+ +---------1 |XX | Terminator |XX | |XX | | 1 | |XX J3 | |XX Power

+---------------------------------------------------------+ 1

 

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J U M P E R S

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SEAGATE ST4026/4038/4051 PRODUCT MANUAL 36038-001, REV. A, 2/5/87

Jumper Setting

==============

The ST4038/4051 may be configured for specific system requirements.

 

Drive Configuration Shunt: J9

-----------------------------

J9 is a right-angle shunt located midway between the J1 and J2 connectors. The ST4026 has an eight-pin shunt. The ST4038/4051 have a sixteen-pin shunt. Use the provided shorting block(s) to enable the Drive Select line and any options.

Drive Select

------------

The Drive Select line enables the controller to select and address the drive. Control cable interface options may use either a Daisy- Chain or Radial configuration.

Pins 1-2 shorted enables DRIVE SELECT 1

Pins 3-4 shorted enables DRIVE SELECT 2

Pins 5-6 shorted enables DRIVE SELECT 3

Pins 7-8 shorted enables DRIVE SELECT 4

ST4026 J9 ST4038/4051 J9 --------- -------------- +-------- DS4 +-------- DS4 | +------ DS3 | +------ DS3 | | +---- DS2 | | +---- DS2 | | | +-- DS1 | | | +-- DS1 +-+-+-+1+ 15-+-+-+-+-+-+-+-+ +-+-+-+-+ +-+-+-+-+-+-+-+-+ +8+-+-+-+ +-+-+-+-+-+-+-+-2 | | | +---------- NOT CONNECTED | | +------------ WRITE FAULT | +-------------- RECOVERY MODE +---------------- RADIAL

Daisy-Chain/Radial Drive Configurations

---------------------------------------

The ST4038/4051 can be configured in either a Daisy-Chain or Radial mode. The ST4026 can be configured in a Daisy-Chain mode only.

In a Daisy-Chain configuration, the last drive in a chain must have the resistor termination pack installed.

The radial option on the ST4038/4051 is enabled by shorting pins 15 and 16 at J9. The resistor termination packs must remain installed on any radially configured drive.

 

Write Fault Latch options: JP2 and J9

-------------------------------------

The ST4038/4051 allow the user to configure the Write Fault reset to specific system requirements. These drives have provisions for pins to be installed at JP2 to enable the desired options.

NOTE

As shipped, there may be a trace between pins 2 and 3 on JP2. This trace must be cut to allow use of the options requiring pins 1 and 2.

JP2 Unlatched: Write Fault will be cleared when write gate is false. A Write Fault will only occur when write gate is True.

JP2 Latched: This option will maintain Write Fault True after write gate goes false and is recommended for controllers that do not edge- detect Write Fault.

The latched operation has two configurations which are provided at the J9 shunt, pins 11-12.

1. No jumper at J9: The Write Fault signal can only be cleared by a power-on/off cycle. Use of this option in conjunction with the DC- Unsafe option is not recommended.

2. Pins 11-12 shorted at J9: The Write Fault signal can be cleared by de-selecting the drive. When the drive is deselected, and the fault condition is corrected, the Write Fault signal will be false.

 

DC-Unsafe Option: JP1

---------------------

There are provisions on the ST4038/4051 for pins to be installed to enable this option. When shorted, a DC-Unsafe condition will cause a Write Fault to be sent to the interface.

 

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I N S T A L L

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SEAGATE ST4026/4038/4051 PRODUCT MANUAL 36038-001, REV. A, 2/5/87

Notes on installation

=====================

 

Drive mounting

--------------

horizontally vertically +-----------------+ +--+ +--+ +------------------+ | | | +-----+ +-----+ | | | x | | | | | | | | x+----------------+x +-+-----------------+-+ | | | | | | ||x x|| +---------------------+ | | | | | | || x x || | | | | | | || x x || x x | | | | | | || x x || +------x------x-------+ | +-----+ +-----+ | || xx || +-+------x--x-------+-+ +--+ +--+ || x x || | xx | || x x || | x x | || x x || +---x--------x----+ |x x| x x x++----------------++x UNACCEPTABLE! UNACCEPTABLE! The ST4026/4038/4051 may be mounted horizontally with the Main Control PC Board with the J1 and J2 connectors down or on either side. Mounting vertically on either end is a prohibited orientation. The drive should not b etilted front or back, in any position, by more than 5*. For optimum performance the drive should be formatted in the same orientation as it will be mounted in the host system.

 

Shock Mounting Recommendations

------------------------------

It is recommended that any external shock mounts between the drive and the host frame b edesigned so that the composite system has a vertical resonant frequency of 25 Hz or lower. A minimum clearance of 0.050 inches should be allowed around the entire perimeter of the drive to allow for cooling airflow and moton during mechanical shock or vibration.

 

Mounting Holes

--------------

4 on bottom, 2 on each side: 6-32 UNC-2B x .31 deep min.

 

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F E A T U R E S

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SEAGATE ST4026/4038/4051 PRODUCT MANUAL 36038-001, REV. A, 2/5/87

Introduction

------------

This manual supports the ST4026/4038/4051 disk drives. It is a consolidation of the ST4026, ST4038 and ST4051 Product Manuals, part number 36011-001, 36012-001 and 36013-001, which are now out of print.

 

Shipping Zone

-------------

Upon power-down, the actuator will automatically position the read/ write heads over the shipping zone and carriage lock will engage. All portions of the head/slider assembly will park inboard of the maximum data cylinder. When power is applied the lock will automatically disengage and the heads will recalibrate to Track 0.

 

Seek-Retry

----------

Seek-Retry is an internally generated command implemented by the drive to enhance seek performance. If the drive detects an off-track condition, or the seek was not completed, th edrive will recalibrate the heads to Track 0 and retry the seek. All writing is inhibited during retry. If the target is still not achieved, or the seek was not completed, the drive will set Write Fault true, and Ready and Seek Complete false. Write Fault will remain active until the condition that caused the fault is corrected and the reset is completed.

 

Auto-Truncation

---------------

The drive will enter the auto-truncation mode if the controller issues an excessive number of step pulses, which would place the read/wrie heads outward beyond Track 0 or inward beyond the maximum data cylinder. With auto-truncation active, the drive will ignore additional pulses, take control of the actuator, and recalibrate the heads to Track 0. CAUTION If the controller is still issuing Slow-Step pulses after the drive issues Seek Complete from auto-truncation mode with Direction In false, or step the remaining cylinders with Direction In true.

 

Precompensation

---------------

The ST4051 does not require precompensation. Precompensation is required for the ST4026/4038 on cylinders 300 through the maximum data cylinder in order to achieve optimum performance. The optimum amount of precompensation is 12 nsec. for both early and late bits. The table below indicates the bit patterns and the direction to be compensated.

+---------+-------+----+-----------------+

|Previous |Sending |Next | Timing |

+----+----+-------+----+-----------------+

| X | 0 | 1 | 1 | Write Data Late |

| X | 1 | 1 | 0 | Write Data Early |

| 1 | 0 | 0 | 0 | Write Clock Late |

| 0 | 0 | 0 | 1 | Write Clock Early |

+----+----+-------+----+-----------------+

An X denotes a don't care state

 

Bit Jitter

----------

Bit jitter reduction determines the relationship between the leading esge of read data and the center of the data window. The specified read error rates are based on the following bit jitter specifications: the data separator must provide at least -40 dB of bit jitter reduction at 2F with an offset error of less than 1.5 nsec. shift from the center of the data window.

 

Media Defects

-------------

A media defect is a read error when the data, which has been correctly written, cannot be recovered within 16 retries. A printout will be provided with each drive shipped listing the locations of any defect by head, cylinder, sector and byte. It will also specify the number of bytes from index.

ST4026

There will be no more than thirty-two (32) defects total per drive. Cylinder 0 will be free of defects.

ST4038

There will be no more than thirty-six (36) defects total per drive. Cylinder 0 will be free of defects.

ST4051

There will be no more than forty (40) defects total per drive. Cylinder 0 will be free of defects.