1. IBM Task Force Findings
4-20-1998
Summary:
The attached presentation is a summary of the “IBM Task Force
Findings” that first discussed the issues related to Areal Density
Growth and its affect on ECC. The “ECC- Capabilities, Overhead
and Complexity -- M. Hassner” slide on page 5 was the technical
motivation behind the initiative by Ed Grochowski (IBM-
Research/IDEMA) and Martin Hassner (IBM-Research) to found
the HDD-industry wide IDEMA 4K-Block Committee in the year
2000.

2. 6 Bits and a Track at
10 to 100 Gb/in2
20 Gb/in2
40 Gb/in2
80 Gb/in2
100 Gb/in2
10 Gb/in2
Track PitchRead Width
B=64 nm
TP=508 nm
RW=305 nm
B=64 nm
TP=254 nm
RW=152 nm
B=45 nm
TP=180 nm
RW=108 nm
B=40 nm
TP=161 nm
RW=96 nm
B=80 nm
TP=803 nm
RW=482 nm
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3. 10 20 30 40 50 60 70 80 90 100
6
8
10
12
14
16
GrainSide&Thickness[nm]
10 20 30 40 50 60 70 80 90 100
100
150
200
250
GrainArea[nm2]
10 20 30 40 50 60 70 80 90 100
500
1000
1500
2000
2500
3000
Areal Density [Gb/in2
]
GrainVolume[nm3]
10 20 30 40 50 60 70 80 90 100
0
10
20
30
40
Grainscross-track
10 20 30 40 50 60 70 80 90 100
3.5
4
4.5
5
5.5
6
Grainsdown-track
Areal Density [Gb/in2
]
Grain Geometry at 10 to 100 Gb/in2
Grain side
Grain Thickness
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4. 10 20 30 40 50 60 70 80 90 100
-7
-6
-5
-4
-3
-2
-1
0
MediaSNR[dB]
A real D ens ity [G b/in2
]
Media Noise at 10 to 100 Gb/in2
Transition Parameter and
Magnetic Spacing at 10 to 100 Gb/in2
10 20 30 40 50 60 70 80 90 100
0
5
10
15TransitionParameter[nm]
10 20 30 40 50 60 70 80 90 100
10
15
20
25
30
35
Mag.Spacing[nm]
Areal Density [Gb/in2
]
awc
a0
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5. Pattern Dependent Thermal Decay
in a Pseudorandom Data String for
a Low Coercivity Disk
Alex Taratorin, 4/21/98
before decay
after decay
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6. ECC - Capabilities,
Overhead and Complexity
ECC - Short Block Size
Block size = 175 symbols
Bits/symbol = 8
OTF = 16 symbols
Pbmax = 10-2
Overhead = 19%
Cost = 140k gates
Current ECC
Block size = 175 symbols
Bits/symbol = 8
OTF = 4 symbols
Pbmax = 10-5
(Pe = 10-17
)
Overhead = 4.57%
Cost = 35k gates
ECC with 4k Block Size
Block size = 2730 symbols (4kB)
Bits/symbol = 12
OTF = 70 symbols
Pbmax = 10-2
(Pe = 10-15
)
Overhead = 5%
Cost = 490k gates
Martin Hassner, 4/21/98
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7. Yukon Cypress 10 Gb/in2 Demo
0
0.1
0.2
0.3
0.4
0.5
0.6
MagnetizationDecay[%/dec]
Magnetization Decay
at 300 K and Happ=0
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