Magnetic Tape as the Mass Storage Medium

Transcription

1 Magnetic Tape as the Mass Storage Medium Ted Schwarz Peregrine Recording Technologies 1462 Tamberwood Trail, St Paul MN Phone: ; FAX: aol.com Presented at the THIC Meeting at the Embassy Suites Hotel Denver South Englewood CO on June 27, /9/00 1

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3 Density/Capacity Cost Performance (Data Rate) Key Technologies Summary 3

4 1. Magnetic Disk Drive Cost/bit 2. Total Volumetric Density Not Areal Density Archival Storage Density 3. Thru-put 4

5 3 2 5

6 (2 b/um 3 ) 6

7 track density: 20,000 tpi 787 tpmm linear density: 300,000 bpi 11,811 bpmm areal density: 6.00 Gb/in Mb/mm 2 layer density: 5,000 lpi 197 lpmm vol density: 3.80 TB/in MB/mm 3 LTO Cartridge: tape width: 0.50 inches mm tape length: 5512 feet 1,680 m total area: 230 ft m 2 volume: 4.71 in 3 77,183 mm 3 user efficiency: 70% 70% CAPACITY: TB TB THIC-0627.XLS 7

8 3.8 TB/in 28 GB/in 3 LAYER LINEAR TRACK TRACK DENSITY (trks/inch) BIT DENSITY (kbpi) ,000 nasa density increase GROWTH RATE 8

9 30,000 10,000 ATS LTO TRACK DENSITY (tpi) E THIC6-Density Migration Path.tas LINEAR DENSITY (kbpi) 9

10 2 Gb/in HDD E THIC General Availability Year 10

11 ATS 2 Gb/in HDD E THIC LTO General Availability Year 11

12 1000 Tape Drives 100 Cost (OEM/Integrator) - $/GB) Disk Drives Tape Media Only Performance Disk Subsystems General Availability Year THIC Costs(1)

13 1000 Tape Drives 100 Cost (OEM/Integrator) - $/GB) Disk Drives Tandberg SLR50 On-Stream Drive On-Stream Cart Tape Media Only Performance Disk Subsystems General Availability Year THIC A Costs(1)

14 Original Estimate Tape Drives Cost (OEM/Integrator) - $/GB) Disk Drives Tandberg SLR50 On-Stream Drive On-Stream Cart Original Estimate Tape Media Only Performance Disk Subsystems General Availability Year THIC B Costs(2)

15 LINEAR RECORDING READ TRACK AZIMUTH RECORDING READ TRACK FOR THE SAME READ TRACK WIDTH & PERFORMANCE, AZIMUTH RECORDING CURRENTLY HAS A 2:1 ADVANTAGE IN TRACK DENSITY. AS THE TRACK DENSITY INCREASES FASTER THAN THE LINEAR DENSITY AND THE TAPE SUBSTRATE DIMENSIONAL STABILITY IMPROVES THAT ADVANTAGE WILL SHRINK TOWARDS A 1:1 RATIO. THIC Recording Method 15

16 read rvrs write rvrs 90 Head Structure tape motion write fwd. read fwd. tape motion nasa00301d-heads 16

17 Data Rate vs. Speed and No. of Elements Data Rate (Mb/sec) assumes 300 kbpi GB/sec Linear (1) Helical(2) m/s ips HEAD-TO-MEDIA SPEED RPM* * 25 mm hub THICKK Data Rate 17

18 GB/SEC channels data rate transfer time single channel data rate transfer time hours days TRANSFER TIME 300 kbpi TAPE SPEED (M/SEC) THIC4A-Data Rate & Transfer Time.tas

19 min. 100K 1000 hr (41.6 days) 10 days 10K 100 hr 1 day 1K 10 hr 1.0 Gb/sec 10 TB hr 1 TB ASSUMES 100 % DUTY CYCLE 100 GB K Data Rate (MB/sec) 19 THIC4B

20 250 D6 200 PRICE ($000) HELICAL 50 MAMMOTH & DVC (6 MB/S) LINEAR DATA RATE (MBYTES/SEC) atp D5 400 ips 16 ch 32 ch

21 3480 gs ccp THIC7-head contours 21

22 TAPE MOTION THIC Head Layouts 200 UM < 5 UM 400 UM TWO PLANAR COIL ELEMENTS 22

23 High Data More Rate Channels Wider Spans Greater TMR Lower Track DensitiesSmaller Capacity Massive CapacityHigher Track Densities Smaller TMR Smaller Span Fewer Channels Lower Data Rate THIC Pardox 23

24 Dimensionally Stable Substrate Closely Spaced Channels Low noise media Maintain intrinsic SNR Reduced surface roughness Mech. Alignment & Tolerance Compensation 24

25 READ GAP SUBSTRATE ( um) ~30 um TRACK (CURRENT) WRITE GAP 1.27 um TRACK (20,000 tpi) SKEW/ AZIMUTH OFFSET & WEAVE 10X MECHANICAL & PHOTOLITHOGRAPHIC OFFSETS SKEW & AZIMUTH 20ktpi Same Gap R/W THIC R-W Separation 25

26 3.8 TB/in 28 GB/in 3 LAYER LINEAR TRACK TRACK DENSITY (trks/inch) BIT DENSITY (kbpi) ,000 nasa density increase GROWTH RATE 26

27 Higher Coercivity (> 2500 Oe) Improved SNR/unit width Reduced Defects Smaller Particles Smoother Surfaces Thinner Magnetic Layer ( <.05 um) Multi-layers Metal Film Perpendicular? 27

28 Reduced Dimensional Instability 1000 PPM PPM Humidity Temperature Tension Creep/Compliance High T G (For Metal Film) Thinner ( 4 um 2 um?) Smoother Stronger 28

29 LAYER DENSITY BIT DENSITY SUBSTR SUBSTR MAG COAT CHNNL MAG COAT HEADS TRACK DENSITY CHNNL SUBSTR SERVO HEADS VOLUMETRIC DENSITY CHNNL HEADS SUBSTR SERVO ISTS-Contributions 29

30 6 Gb/in TB/in 3 > 3X Bit Density ~25X Track Density 30

31 Data Rate Substrate Dimensional Stability Head Complexity/Span Mechanical Tracking Tape Speed Head Wear Handling Tape Durability 31

32 -Jim Hughes StorageTek NASA Mass Storage Conference April