Study of Error Propagation due to Dust for Thin-Cover Coat Disk Systems

Abstract

We discussed data error propagation due to dust on disk surfaces in cases of various cover coat thicknesses and dust sizes. We proposed a system durability gauge K-value and discussed abilities of error correction codings (ECCs) by using a measured Kvalue. A measured dust particle distribution was shown, and error propagation was calculated for thin-cover cases with different K-values. We found that 0.6-1.2 mm cover coat disk systems are free of errors due to dust and a thin-cover coat disk is not always worse. In the thin-cover coat systems, it is particularly necessary to increase K-value and to optimize ECC schemes.

Minimum-Latency Tracking of Rapid Variations in Two-Dimensional Storage Systems

“…In this simulation, sinusoidal dc-offset variations (with unit amplitude) are considered with the following frequencies: and . The conditions are representative for severe but not extreme situations (scratches, dropouts, fingerprints ) in an experimental system [20]. Due to the resonance effect, the insertion of a delay into the inner loop causes a substantial degradation in MMSE for the individual adaptation loops (which is in agreement with the analysis of Section III-A).…”

“…Other reasons for fast common channel parameter variations are: dust, fingerprints, scratches on the disc, dropouts, etc. [20], [22]. These observations lend support to the assumed parameter model, not just for TwoDOS but also for other 2-D storage systems.…”

“…The results obtained in this section were obtained under relatively favorable conditions as ideal parameter values do not have substantial common high-frequency content. As a result, the MMSE gain due to the minimum-latency strategy will be higher if the ideal parameter values will have more common high-frequency content as is the case under extreme situations (severe scratches, dropouts, dust on the disc [20]). …”

“…The parameter transfer function of the inner row is changed to (20) Consequently also the mismatch of the inner row is changed. In Fig.…”

Highly Sensitive Detection of Red Blood Cell Aggregation with Ultrasonic Peak Frequency

“…Research has been conducted to measure the particle distribution in various media. [11][12][13][14][15] On the basis of the finding that blood viscosity highly correlates to a certain degree with the RBC aggregation phenomenon mentioned above and that aggregate size is reflected in an ultrasonic scattering spectrum, several trials have been conducted on the ultrasonic estimation of the diameter of aggregates. [16][17][18][19][20][21][22][23] The reflection coefficient between RBCs and the serum is very small because both of them have similar acoustic impedances.…”