NASA Technical Reports Server (NTRS) 19930022783: National Media Laboratory: Media testing results

12 Pages·0.27 MB·English

by  NASA Technical Reports Server (NTRS)

National Media Laboratory
Media Testing Results
Bill Mularie
Gary Ashton
National Media Laboratory
3M Center
Building 235-3B-30
St. Paul, MN 55144 1000
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Presentation Topics:
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Laboratory
1 Results of D.1 Testing
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National Media Laboratory
U. S. Government Users:
Industry:
•3MStorage Media Laboratory
•3M Hardware and Electronic Resources
•Ampex Recording Systems
•DataTape
University:
•Center for Magnetic Recording Remmrch
Unlvemlty ofCellfomla, San Diego
•Center for Materials for Information Technology
(MINT)
University of Alabama
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Purposes of NML Activities
le Help set reasonable
performance/reliability expectations
for advanced recording hardware and
media
Give the PO's data to assist in making
1
program choices
e Help translate government program
needs to recorder/media industry
m Irritate the Industry into doing better
for data recording
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Critical Issues in Government
Mass Storage
Skyrocketing requirements:
Platform data rates > 1 Gigabit/sec.
Storage of terabytes/day.
Archive of > 10 years.
Government leads Industry by 3-5 years.
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Data Storage Comparisons
Requirement: Data Rate 800 MBits/Sec
Performance of Media
Parallel
Data Rate Capacity 1Day Storage Hardware
(MBit=/Sec ' (MBits) (Units) Requirement
0.5 16 4,200,000 1600
D+skeff.es Dr+yes
12" 2.4 6,000 11t500 Disks 334
Drive==
8
232,000
Recorders
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Storage Capacity (bits)
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Principal "Drivers" for
Advanced Recording Systems
Video Data
Increasing
Reliability
Capacity/Cassette
Environmental
Oecmasing
Stability
System Form
Factor Archivability
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VideoMilpltion Path ConsumeVrideo
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National Media Support
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Technology
Technology
National Media Laboratory
Testing Results:
Moisture Content of D-1 Tapes When
Delivered
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Overview
1. Why Look at D-1 ?
2. Goals
3. Information Available
4. Moisture Content
5. Conclusion
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Why Look at D-1 ?
•
New Format With Little Experience And Data
MIL-STD-2179
ANSI X3.175-1990 (Tape Format).
ANSI X3B.5/90-133 (Tape Cartridge)
Professional Video Use _ Data Storage Use
Military Use _ Commercial Use
ATARS And JSIPS Use Of D-1 Cassettes
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2. Goals
Evaluate D-1 Media And Cassettes
ATARS & JSIPS
Determine Environmental Window
Measure Media Properties
Improve Packaging
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Information Available
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IndiaEvlduuon o!D-1 TameandCueem SurfaceRougnneM ofSonyandAmpex0.1
ChiitlCtarii_¢l Tape
PackagingPlan I_ 0-1 CuNtms Coaar_ andSulNtrato Thic_NNmof
andAmpex0.1TLoe
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CluenN and Cases S_ffnesl ofSony andAmpex0-I Tapell
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Interest in Moisture
1
Content
Conditioning Needed ?
Time To Condition ?
Archive Evaluation
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4.1 Behavior of D-1 Cassettes
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4.2 Solution to Diffusion
Equation
W(r,t) = Wa + (Wi- Wa) F(r,t)
Wa = Equilibrium Weight in Ambient
Humidity
Wi = Initial Sample Weight
F(r,t=O) = 1
F(r,t===) = 0
o_ F(r,t===)/_ - 0 (Steady State at t--==)
Sample Geometry Is In F(r,t)
4.3 Moisture Content Theory
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