HDD HDD HDD HDD HDD HDD IDEMA Japan News No. 36 2
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- とらふみ たなせ
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1 F TEL FAX ( ) ( ) 1 13:00 17:00 10,000 12,000
2 HDD HDD HDD HDD HDD HDD IDEMA Japan News No. 36 2
3 1. HDD 20 1Gbits/in 2 HDD HDD Desktop PC 3.5 HDD Portable PC 2.5 HDD HDD 1 1 HDD 1 HDD TMR Track Misregistration TMR SNR 2 2 R&D IDEMA Japan News No. 36
4 3 TMR Co SNR Co 50Gbits/in 2 Co Co Pt Ku Co Co Gbits/in 2 Co 400Gbits/in 2 Co TMR 3. TMR 3 IDEMA Japan News No. 36
5 6 TMR 4 HDD PES Position Error Signal 4 FFT PES 5 5 Ave. 3 1 Specific Modulus HDD Ave. 3 6 Ave IDEMA Japan News No. 36
6 7 NSIC 100Gbits/in 2 580KBPI 170KTPI 10000rpm rpm HDD rpm 100Gbits/in 2 TMR 100Gbits/in 2 HDD HDD Co CrMo CoCrPtTa NiAl NiAl Co CoCrPt Si Cr Hz IDEMA Japan News No. 36
7 Co Co Co 7 Dynamic Remanence Coercivity 7 Hcr Co 7 Co 7 Co 7 Switching Volume Dynamic Remanence Coercivity Dynamic Remanence Coercivity Co Co Co and/or Co HDD 6. HDD 21 HDD HDD HDD 21 HDD IDEMA Japan News No. 36
8 Disk vibration vs. TMR * LDV FFT DAD:Disk Axial Displacement Po wer spectral of the Disk Axial Displacement PES:Position Error Signal VCM SERVO FFT Cumulative TMR = 3σ = 3 Diskmodes axialvariance= σ f 0 PSD 2 = f 0 PES ( f ) df PSD DAD ( f ) df Po wer spectral of the Position Error Signal CTMR Axial Disk Modes We can estimate TMR from the axial disk modes by disk vibration measurement. *Jeffrey S.McAllister, Th e effect of d isk platter reso nances on tr ack misreg istration in 3.5 inch disk dr ives IEEE Trans.Mag n.,vo l.33,pp ,1996 IDEMA 11/5/99 4 TMR
9 基 板 振 動 特 性 ( 変 位 量 共 振 周 波 数 ) Axial displacement :3 σ [um] Al 3.5" x 1.27 Al 3.5" x 0.8 Gl 3.0" x 1.0 BW=3.2[kHz] Revolution[rpm] Axial displacement:3σ[um] Axial Disp. 1 / F(n,m) Rev.[rpm] Frequency of the 1st. bending mode: F(0,1)[Hz] Fig. Disk axial displacement vs. rpm for the various disks Fig. Freq. of the 1st. Bending mode vs. Disk flatter Fig. Waterfall plot of the disk vibration vs. rpm IDEMA 11/5/99 Frequency of the 1st bending mode:f(0,1)[hz] F E/ρ Current servo band width 2.5" x t " 3.0" x t "xt1.0 t1.27 t1.0 t " x t1.0 F t Specific modulus : E/ρ Fig. Freq. of the 1st. Bending mode vs. Specific modulus
![bending mode: F(0,1)[Hz] Fig. Disk axial displacement vs. rpm for the various disks Fig. Freq. of the 1st. Bending mode vs. Disk flatter Fig. Waterfall plot of the disk vibration vs.](/docs-images/53/20117591/images/page_9.jpg "rpm IDEMA 11/5/99 Frequency of the 1st bending mode:f(0,1)[hz] 1600 1400 1200 1000 800 600 400 F E/ρ Current servo band width 2.5\" x t0.635 5 3.5\" 3.0\" x t1.")
10 HOYA / 60-80% / / 35 / / 30-40nm 30 / 18nm Ra 0.2nm Rmax 3.0nm Ra 10 10nm 10m (LZT) 10 IDEMA Japan News No. 36
11 Ra Load/Unload Load/Unload 1 HDD G G 200G 2 IDEMA Japan News No
12 1 2 2 Na K KNO Li Na KNO3 NaNO3 4 ( 150 ) 3 AFM 100nm 10nm Track isregistration (TMR 5400rpm 7200rpm 10000rpm 12000rpm 3 AFM 4 4 TMR F( rpm) a 2 1 W = 3 4 Eβh λ 2 ( ν ) W F(rpm) E h W h a E W HDD 12 IDEMA Japan News No. 36
13 4 TMR % 30% 150GPa GPa Quantum TMR TMR Al2O3 ZrO2 SiC 2 2 Al 3.5inch/0.8mm ( 6) 150GPa GPa 215GPa ZrO2 TMR 150GPa 0.8mm 1.1mm Al Al 2.5 Al Al IDEMA Japan News No
14 2 5 TMR 6 14 IDEMA Japan News No. 36
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16 IDEMA Japan No ( IDEMA )
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20 HDD % 1-a b HDD Q 231 1$ % 1-a HDD 99 3Q WD IBM Maxtor 6 Maxtor 2-a HDD Sh 140 ip 120 m en CY Sa 30 les ($ Shipment Sales 1-b 1999 HDD b ,000 50,000 Shipment (k/q) 40,000 30,000 20,000 10, Q 99 2Q 3Q 4Q CY 2 HDD Seagate Quantum WD 3 IBM Maxtor 99 3-a c 4 Quantum Seagate WD Maxtor 4 19 IDEMA Japan News No. 36
21 Revenue ($M/Q) 70% HDD IIT WD ,000 2,500 2,000 1,500 1, a 0 1Q 97 2Q 3Q 4Q 1Q 98 2Q 3Q 4Q 1Q 99 CY 2Q 3Q 4Q Seagate Quantum Maxtor WD Sales ($M/Q) 6,000 5,000 4,000 3,000 2,000 1, Q 97 3-c 2Q 3Q 4Q 1Q 98 2Q 3Q 4Q 1Q 99 CY 4 HDD HDD PC A/V HDD % % 35% 30% 25% 20% 15% 10% 5% 0% 2Q 3Q 4Q 4 HDD Inventory/Sales FGI WIP RAW Sales 3-b 400, ,000 40,000 35,000 Net Income ($M/Q) Seagate Quantum Maxtor WD Shipment (k/y) 300, , , , ,000 50, CY 30,000 25,000 20,000 15,000 10,000 5,000 0 Revenue ($M/y) Shipment Revenue Q 97 2Q 3Q 4Q 1Q 98 2Q 3Q 4Q 1Q 99 2Q 3Q 4Q CY IDEMA Japan News No
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