Technology Development for a Linear Tape Multi-terabyte terabyte Tape System

Transcription

1 Technology Development for a Linear Tape Multi-terabyte terabyte Tape System (NIST ATP PROGRAM 70NANB2H3040) Ted Schwarz Peregrine Recording Technology 1462 Tamberwood Trail, Woodbury MN Phone: FAX: tedschwarz@aol.com Presented at the THIC Meeting at the National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder CO July 18-19, 2006 RECORDING TECHNOLOGY, INC. 7/11/2006 1

2 Performance Objectives Current Goal 1500 tpi 125 kbpi Mb/in Layers/in 0.04 TB/in 3 ~50,000 tpi 300+ kbpi 15+ Gb/in 2 ~5000 Layers/in ~10 TB/in ips 400 ips 7/11/ RECORDING TECHNOLOGY, INC.

3 Performance Objectives Currently 60 trks/mm 5000 b/mm 300 kb/mm Layers/mm 42 Mb/mm m/sec Goal 1970 trks/mm 12,300 b/mm 24 Mb/mm Layers/mm 4.8 Gb/mm 3 10 m/sec 7/11/ RECORDING TECHNOLOGY, INC.

4 Areal Density Migration 100K density migration Gb/in 2 MTS II 25 MTS II TRACK DENSITY (tpi) 10K Mb/in 10 Mb/in 1 Mb/in 0.1 Mb/in E 1 Gb/in MTS I ATS LTO4 LTO3 LTO 2 LTO 1 2 Areal Density (Mb/mm ) LINEAR DENSITY (kbpi) YEAR OF INTRODUCTION 7/11/ RECORDING TECHNOLOGY, INC.

5 Key Program Elements LAAZR (Large Angle AZimuth Recording) Sputtered Metal Film Media Corrosion/wear Resistant GMR Heads High Density Servo w/embeded ID s Dual Actuators Enhanced Tape Guiding Small Ch.-to to-ch. Spacing multi-element Heads LDPC/SOVA Error Correction Higher Temperature Substrate 5

6 LAAZR 45º Advantages: Large adjacent track signal suppression ~ 30% % Head span reduction ~ 30% Reduction in tolerances Challenges: Trailing element azimuth sensitivity Larger Head Structure 6

7 Normalized Amplitude Density Response & Attenuation data signal azeval Nov-2005 Figure 2 Recording Parameters : Mr: 150 emu/cc Hc: 3400 Oe y: 25.0 nm t: 10.0 nm g: nm a: 2.9 nm PW50: nm θ: 45.0 deg W: 0.5 um re s idual Recording Density (kfci) 7

8 TRACK PITCH (UM) Azimuth Gain AZIMUTH VS. CONVENTIONAL TRACK PITCH CAPABILITY MTS AZIMUTH MAX CONVENTIONAL MAX AZIMUTH TARGET RATIO OF MAXIMUMS INSIC 2015 TARGET MTS-INSIC DENSITIES442.CAD RATIO OF: AZIMUTH MAX / CONVENTIONAL MAX 3 7/11/ RECORDING TECHNOLOGY, INC.

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10 Servo CNR 20 On Track Servo PES Spectrum E+00 1.E+06 2.E+06 3.E+06 4.E+06 5.E+06 6.E+06 7.E+06 8.E+06 9.E+06 1.E+07 Frequen cy ( Hz) 10

11 Metal Film Media ~30 um SMF (CoCrPt) AME(CoCo-O) LUBE DLC MAG LAYER INTERLAYER CrX NiAl SUBSTRATE MTS Overview Media 11

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14 16 Channel GMR Heads Improved Head/Media Interface Low pressure contact Negative pressure air-bearing Flux Guide Low PTR Pole Material & Processing Copperless GMR (for corrosion) 14

15 Azimuth Heads 15

16 Reduced Channel Spacing Reduces Media Dimensional Instability Effect 200 UM PLAN VIEW PLANAR COIL 50 UM 20 UM HELIX COIL CURRENT MTS II Advanced MEDIA 16 CHANNEL HEAD SPAN: ~1.5 mm 16 CHNNL heads SPAN: 0.75 mm 16 CHNNL SPAN: 0.3 mm 7/11/ RECORDING TECHNOLOGY, INC.

17 Data Rates Multi-channel Data Rates RAW TRANSFER RATE (GBYTES/SECOND) CHANNELS 32 CHANNELS 16 CHANNELS 500 kbpi 300 kbpi 500 kbpi 300 kbpi 500 kbpi 300 kbpi Gbits/SECOND 7/11/ RECORDING TECHNOLOGY, INC.

18 Transfer Times Multi-channel Data Rates TRANSFER TIME: HOURS CHANNELS 32 CHANNELS 25 TB Uncompressed Capacity 50 % Transfer efficiency 500 kbpi 300kbpi 5 64 CHANNELS TAPE SPEED (METERS/SECOND) 18

19 Servo Pattern SERVO PAIR SERVO PAIR SERVO PAIR SERVO PAIR MTS Tracks PREVIOUS DATA W R R W SERVO GUARDBANDS SERVO PAIR SERVO PAIR SERVO PAIR SERVO PAIR SERVO PAIR RECORDING TECHNOLOGY, INC. 7/11/

20 DUAL ACTUATORS TAPE DIRECTION HEAD MOTION READ ARRAY SERVO ELEMENTS θ WRITE ARRAY HEAD MOTION WRITE ARRAY READ ARRAY Dual Actuators

21 Sources of Tracking Error Head Photolithographic Tolerances Assembly Offset Media Substrate Dimensional Instability Servowriting Drive/Transport Head Parallelism with Guides Lateral Tape Motion Tape Edge Weave Guiding Vibration 7/11/ RECORDING TECHNOLOGY, INC.

22 Tape Guiding Challenges Thinner Substrates High Speed Tape Wander Take-up Approaches Long Guides Improved Slitting Non-Edge Guiding 7/11/ RECORDING TECHNOLOGY, INC.

23 Lateral Tape Motion (LTM) Tape Edge/ Fotonic Probe Commercial Drives 7um 20 um p-pp MTS Transport On-tape signal 1-2um p-pp Non-Repeatable 0.1um 0.2 um p-pp Track Following σ Raw LTM Non-repeatable LTM

24 Advanced Channel LDPC Code and SOVA Linear block codes with long code length (1000 bits+) Near-capacity error correcting performance Goals for LDPC code design Low complexity Hardware friendly structure Improved error correcting performance Bi-directional soft output Viterbi algorithm (SOVA) is used as the PR channel detector Implemented in FPGA and fully tested RDG Write processor ENC Magnetic Recording Channel SOVA DEC Read processor ERR ANY 24

25 Native Formatted Capacity: ~ 33 GB 25

26 END Thank you 26

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