IBM C4B 4.51 Brick On Sled carrier 128-pin HPC, SSA Grounding Requirements of the Disk Enclosure

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U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS

O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H

2.2.5 Power Supply Ripple

Externally Generated Ripple10 as seen at drive power connector

+5 V D C

+1 2 V D C

Maximum

Notes

 

 

150 mV

0-20 M H z

peak-to-peak

 

 

 

150 mV

0-20 M H z

peak-to-peak

 

 

 

During drive start up and seeking, 12 volt ripple is generated by the drive (referred to as dynamic loading). If several drives have their power daisy chained together then the power supply ripple plus other drive's dynamic loading must remain within the regulation tolerance window of + / - 5 % . A common supply with separate power leads to each drive is a more desirable method of power distribution.

2.2.6 Grounding Requirements of the Disk Enclosure

The disk enclosure is at Power Supply ground potential. It is allowable for the user mounting scheme to common the Disk Enclosure to Frame Ground potential or to leave it isolated from Frame Ground.

F r o m a Electro-Magnetic Compatibility (EMC) standpoint it will, in most cases be preferable to common the Disk Enclosure to the system's mounting frame. With this in mind, it is important that the Disk Enclo- sure not become an excessive return current path from the system frame to power supply. The drive's mounting frame must be within ± 150 millivolts of the drive's power supply ground. At no time should more than 35 milliamps of current (0 to 100Mhz) be injected into the disk enclosure.

Please contact your IBM Customer Representative if you have questions on how to integrate this drive in your system.

2.2.7 Hot plug/unplug support

Power supply and SSA link hot plug and un-plug is allowed for all SSA models.

For Form Factor models, there is no special sequence required for connecting 5 volt, 12 volt, or ground. During a hot plug-in event the drive being plugged will draw a large amount of current at the instant of plug-in. This current spike is due to charging the bypass capacitors on the drive. This current pulse may cause the power supply to go out of regulation. If this supply is shared by other drives then a low voltage power on reset may be initiated on those drives. Therefore the recommendation for hot plugging is to have one supply for each drive. Never daisy chain the power leads if hot plugging is planned. H o t plugging should be minimized to prevent wear on the power connector.

The carrier models may be hot plugged ONLY IF the ground pins (longer pin) make contact first (before other pins which are shorter). Vice versa, the carrier may be hot unplugged ONLY IF the ground pins (longer pins) are the last to remove (after other pins which are shorter). DAMAGE TO THE FILE ELEC-

TRONICS AND THE ADAPTER ELECTRONICS COULD RESULT IF THE ABOVE CONDITIONS ARE NOT MET. The mating H P C connector MUST HAVE PROGRAMMABLE PIN LENGTH. GND

PINS MUST BE LONGER THAN SIGNAL AND POWER PINS. THE GUIDE PINS MUST BE TIED TO THE DOKING ASSEMBLY FRAME GND

10 This ripple must not cause the power supply to the drive to go outside of the ± 5 % regulation tolerance.

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I B M Corporation

Source filename=POWER

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Contents Form Factor Disk Drive Version BM Corporation Preface Source filename=STSSHEXT When Reliability Operating LimitsContaminants Acoustic Levels Source filename=STSSHEXT Interface Controller Features FeaturesGeneral Features DescriptionReliability Features ModelsSpecifications GeneralUser bytes/logical block ub/lba User bytes/sector ub/sctSectors/logical block sct/lba Sectors/track sct/trkCapacity Equations For Each NotchFor Entire Drive Input Voltage + 5 Volts Supply Power Requirements by Model1 C1x Models + 1 2 Volts SupplyExample 3. Power Calculation Power Calculation ExamplesExample 1. Calculate the mean 12 volt average current Things to check when measuring 12 V supply current Example 4. Calculate the 12 volt peak currentVolt current during read/write operations C1x Models Typical 12 volt current C1x Models Typical 12 volt spin-up current C1x Models 2 C2x Models Power Calculation Examples Example 4. Calculate the 12 volt peak current Volt current during read/write operations C2x Models Typical 12 volt current C2x Models Typical 12 volt spin-up current C2x Models 3 C4x Models Power Calculation Examples Example 4. Calculate the 12 volt peak current Volt current during read/write operations C4x Models Typical 12 volt current C4x Models Typical 12 volt spin-up current C4x Models CxB Models Power supply methods4.2 DC/DC Converter Grounding Requirements of the Disk Enclosure Hot plug/unplug supportM Corporation Bring-up Sequence and Stop Times Event Nominal MaximumBring-up Sequence Times and Stop Time for C2x Models Source filename=PERFORM Workload Definition PerformanceEnvironment Definition # of segments Ub/lba +Random Command Execution TimeSequential Basic Component DescriptionsData Transfer to/from Disk Comments Data Transfer to/from SSA LinkApproximating Performance for Different Environments Theoretical Data Sector Transfer RateWhen Adaptive Caching is Enabled When Read Caching is EnabledWhen Write Caching is Enabled When Read-ahead is EnabledReordered Commands When No Seek is RequiredFor Queued Commands Back-To-Back CommandsCylinder to Cylinder Skew SkewTrack to Track Skew Idle Time Functions Predictive Failure Analysis Servo Run Out MeasurementsServo Bias Measurements Channel CalibrationSave Logs and Pointers Command Timeout LimitsDisk Sweep M Corporation Small Form Factor Models CxC Weight and DimensionsMechanical ClearancesDimensions are in millimeters Location of Side Mounting Holes of C4C Models Source filename=MECHANIC Unitized Connector Locations Source filename=MECHANIC Carrier Models CxB Dimensions CxB Models M Corporation Handle Docking and Ejection System Auto-docking Assembly Side Rails Side Rail Positioning Electrical Connector and Indicator Locations E D Locations front view CxB Models M CorporationSSA Unitized Connector Electrical InterfaceCarrier Connector PinRow Option Pins and Indicators SSA Link Electrical CharacteristicsSSA Link Cable Write Protect Option Port Pin Device Activity Pin/Indicator Option Port PinDevice Fault Pin/Indicator Option Port Pin Ground long Option Port Pin12 12V Charge and 5V Charge Power Port pin 1 Front Jumper ConnectorEarly Power Off Warning or Power Fail Power Port Pin Programmable pin 1 Option Port PinSpindle Synchronization Over Sync Hard-wire M Corporation Source filename=RELIABLE Power On Hours Examples Error DetectionSeek Error Rate ReliabilityMaximum on/off cycles Power on/off cyclesUseful Life Product LifeSpql Shipped product quality level Install Defect FreeMean Time Between Failure *MTBF Sample Failure Rate ProjectionsInstall Defect Free percentage Percent Periodic MaintenanceConnector Insertion Cycles ESD ProtectionTemperature Measurement Points Operating LimitsMaximum Reliability P F E TTemperature Measurement Points for all Models bottom view Vibration and ShockOutput Vibration Limits Drive Mounting GuidelinesOperating Vibration Nonoperating Vibration V4SOperating Shock ContaminantsNonoperating Shock Upper Limit Sound Power Requirements Bels for C4x Models Acoustic LevelsSource filename=STANDARD Standards SafetyElectromagnetic Compatibility EMC M Corporation Bibliography Serial Storage Architecture S S a P H Transport
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