DTR 3000 Test System for
Discrete Track Recording
 Digital Decoder for Drive Servo(DTR)
with Programmable Parameters Amplitude and Phase ServoDecoding Servo Signal Analog bandwidth up
to 250 MHz1
 Automatic Media Centering
Mechanism2 to Mechanically AlignMedia to Reduce Track
Eccentricity below 800 nm within
20–30 seconds (typical)
 Track Following with residual RRO
better than 5-7 nm3
 High-bandwidth Servo Loop withtypical 0.2–0.6 nm NRRO3, 1σ
 Full Range of WITE32 Tests,including Parametric, 747, ATI, BER, etc
 Digital Media Scan Test (Digital MSCAN)4 Full compatibility with existing custom WDK modules
 System Supports both DTR Media and Conventional Continuous Media System Supports both Drive Servo and Guzik ServoThe Guzik DTR Test System belongs to a new generation of Guzik test systems
designed for R&D and Production of the Discrete Track Recording components.

1

All specifications are subject to change without notice
US Patent Pending
3
Performance may depend on the actual product (head and media combination)
4
Optional test module
2

Part Number: 02-107507-05, Rev. 5/08/2009, Copyright © Guzik Technical Enterprises. All rights reservedEvery component of the DTR Test System has been redesigned from the ground up toprovide the critical measurement capability to address the emerging need for theDiscrete Track Recording measurements.
The system features up to 4 GBit/s write channel, up to 6 GHz read channel connected
to 20 GS/s waveform digitizer, highly stable spinstand platform designed for recording
densities beyond 700kTPI, and the state of the art programmable drive servo decoder
for DTR servo decoding.

Complete System Solution
Measurement requirements are complex for this new emerging technology, Guzik has
fully integrated all required system components to provide a complete test system
ensuring the fastest time to market possible.

HGARead-Write Analyzer
DTR 3000 Series

Discrete Track Media

SpinstandDTR 3000

Write Data

Waveform Digitizer
WDM5000 Series

Read Data

Figure 1

Servo Control

DTR System Block Diagram

The Guzik DTR Test System is a bundle of all critical components required for DTR test.
These components include:
1. RWA DTR 3000 Series Read-Write Analyzer.
2. Spinstand DTR 3000 with Media Centering Mechanism and Piezo Actuator
Cartridge.
3. WDM5000 Series Waveform Digitizer.

Copyright © Guzik Technical Enterprises. All rights reserved2

RWA DTR 3000 Series
The new generation of Guzik Read-Write Analyzers includes the RWA DTR 3002, RWA
DTR 3003, and RWA DTR 3004. These analyzers feature dual servo channel, capableof decoding both Guzik Servo and Drive Servo.
Servo decoding is performed by programmable digital decoder. You choose between
Amplitude Servo mode and Phase Servo mode. You can also specify parameters of theservo pattern, such as clock frequency, preamble length, number and configuration of
the servo bursts, etc.
The decoder is not based on a PRML chip; it uses the programmable digital signal
processor instead. This provides media design teams with the flexibility to experimentwith various configurations of servo patterns without waiting for a new revision of thePRML chip.

Figure 2

Drive Servo Configuration in WITE32

Copyright © Guzik Technical Enterprises. All rights reserved3Three types of burst modulation are fully supported and tested with DTR media:•Regular Amplitude (2-6 bursts)•Phase-Change Amplitude (2 bursts)•Chevron Phase (2 bursts)

Figure 3 Regular Amplitude servo burst patternFigure 4 Phase-change Amplitude servo burst pattern

Copyright © Guzik Technical Enterprises. All rights reserved

4

Figure 5 Chevron Phase servo burst pattern

Copyright © Guzik Technical Enterprises. All rights reserved

5Spinstand DTR 3000
Guzik spinstand model DTR 3000 includes a media centering mechanism. When amedia with pre-printed servo information is mounted on a spinstand, the servo and data
tracks will have eccentricity up to 50–100 micro-meters in respect to the spin axis.
The media centering mechanism of the DTR 3000 spinstand mechanically aligns thedisk to reduce track eccentricity below 800nm. The process is completely automatedand typically takes less than 30 seconds.

SpindleChuck Cap

Spin Axis ofSpindle

Servo Track
Axis ofConcentricity

Pre-printed or
pre-written
Servo Track
Media is not aligned in
respect to the spin axis

Figure 6

Media is aligned in
respect to the spin axis

Centering of the Media to Reduce Track Eccentricity

Copyright © Guzik Technical Enterprises. All rights reserved6

Figure 7

Figure 8

Track Eccentricity before Media Alignment (RRO 80,000 nm)

Track Eccentricity after Media Alignment (RRO 350 nm)

Copyright © Guzik Technical Enterprises. All rights reserved

7

The piezo actuator cartridge further reduces the repeatable run-out below 5-7 nm using
high bandwidth servo loop combined with servo feed-forward approach.

Figure 9

Track Eccentricity in Track Follow Mode with Servo (RRO 5 nm)

The combination of precision track centering, high stability air bearing spindle, and highbandwidth servo loop are the crucial components that allow for high-TPI DTR testing
using Guzik Spinstand DTR 3000.

Figure 10Position Error Signal (PES)

Copyright © Guzik Technical Enterprises. All rights reserved8

WDM5044 Series
The Waveform Digitizer WDM5044 Series is a high-speed digitizer with sampling rates
up to 10-40 GSample/s. The WDM5044 Series is a successor of the previous
generation Digital Signal Analyzer D5000.

Figure 11

Waveform Digitizer WDM5000 Series

The Waveform Digitizer WDM5000 Series is a critical component of the complete DTR
Test System, which provides the following key features not available with a traditional
peak detector approach:*•Accurate digital measurements with 1% accuracy for heads with signal-to-noise
ratio down to 12dB

•Digital media scanning (Digital MSCAN Test, optional purchase)•

Testing of servo area•

Jitter and Eye Diagram measurements•

Nano-scale magnetic field imaging (3D Pulse Profile Test)•Capturing read-back signal waveforms around the defect area

The WDM5044 is capable of operating in 2 modes – 10GS/sec on 4 channels or 20GS/sec on 2 channels.

Copyright © Guzik Technical Enterprises. All rights reserved

9

The software for WDM 5000 Series includes the following tests and measurements:•Digital Parametric Measurements•

Digital Media Scanning•

Jitter and Eye Diagram Measurements•

3D Pulse Profile Test for Magnetic Field Imaging•

Fast Spectral Measurements

Figure 12

Digital Media Scan Test (MSCAN)

Copyright © Guzik Technical Enterprises. All rights reserved

10Figure 13

Magnetic Field Image of Servo Area Captured with WDM5000 Series

Copyright © Guzik Technical Enterprises. All rights reserved

11

DTR Software Modules and Tests
In addition to the full range of standard WITE32 tests, Guzik offers the following tests
specifically designed for DTR application:•Media Alignment Test•

Servo Distortion Test•

Servo Track Pitch Calibration Test•

Servo Burst Amplitude and Phase Analysis•Servo Area scanner for Digital MSCAN test

•PES Test with Invalid Servo Sector detection•

Sector Selection Test•

Land Offset and DTR W/R Offset Measurement

Guzik is currently working on the following additional DTR tests:•Servo Defect Waveform Capturing for Digital MSCAN test•

Servo Linearity Test•

Land / Groove Width Characterization•

Off-track Envelope Test

Standard Tests Included with DTR System PurchaseParametric Test Module





TAA Test
Overwrite Test
Asymmetry Test
Pulse Width Test
Parametric Test
Read-Only Parametric Test
Signal-to-Noise Ratio Test
Spectral Integral Signal-to-Noise Test
Amplitude Stability Test
Sector Amplitude Stability Test
Resolution Delta Test
Pulse Width Stability Test

Composite Test Module

Frequency Test
Saturation Test
Track Profile Test
MR Saturation Test







Pulse Profile Test
Comparator Error Rate Test
Off-Track Performance Test
Set RPM Test
Spectrum Analysis Test
Triple Track Test

MR Test Module

TAA Asymmetry Test
Pulse Width Asymmetry Test
Pulse Stability Test
Write/Read Offset Test
MR-Impedance Test
WR-Impedance Test
Head Polarity TestSpinstand Test ModuleServo Position Error Signal Test (PESTest)
Off-track Modulation Test

Copyright © Guzik Technical Enterprises. All rights reserved12

NLTS Test Module




Pseudo-Random Sequences
Alternative Spectral Elimination Test
Third Harmonic Ratio Test
MR Transfer Curve Test
Alternate Overwrite Test
NLTS vs. Write Current Test
Signal/Noise Ratio Test

Error Test ModuleComparator Test
Popcorn Test
ModuleDigital Parametric Test
Signal Profile

Jitter Test ModuleJitter Explorer
Media Noise Test

3D Pulse Profile Module(included with DTR System)

3D Pulse Profile Test

Signal Analyzer Module

TFC Test Module

Digital Parametric Test

TFC Measurement Test

Signal Analyzer Test

WCALC – WITE Calculator Module


WITE Calculator for Tests

Developer’s Kits


WDK32 – WITE Developer’s Kit
WDK Script
DDK – PRML Chip Driver Developer’sKit

Optional Purchase Tests
Digital MSCAN – MediaScanningMissing Pulse Detection
Super Pulse Detection
Transition Shift Detection
Thermal Asperity Detection (writtensignal)
Thermal Asperity Detection (erased track)

WESA – Write Excited
Sectored Amplitude Test Module

Separate Amplitude Asymmetry Stability
Triple Amplitude Asymmetry Stability
Write Induced Instability
Pole Erasure

WATI – Adjacent Track
Interference Test Module

Adjacent Track Interference Test
Adjacent Track Interference Multi-Track
Test (WATI MT)

Bit Error Rate (BER) Test Module

BER 747A Test
BER Linear Density Test
BER Error Distribution Test
BER Performance Test

Micro-Actuator Test Module


Stroke Test
Mechanical Frequency Response Test
Micro-Actuator Loop Setup Test
Micro-Actuator Loop Frequency ResponseTest

Perpendicular Parametric Test Module

Differentiator Optimization
Roll-offRise and Fall Time
Saturation Asymmetry
Amplitude Asymmetry

Copyright © Guzik Technical Enterprises. All rights reserved

13Ordering Information
Please contact sales@guzik.com to obtain a quotation for Guzik DTR Test System.

2443 Wyandotte Street
Mountain View, CA 94043
Phone: (650) 625-8000
Fax: (650) 625-9325
E-mail: sales@guzik.com
http://www.guzik.com/

Copyright © Guzik Technical Enterprises. All rights reserved