An Introduction to Direct Access Storage Devices by Hugh M. Sierra

By Hugh M. Sierra

This e-book provides an exposition of the know-how, layout, association, and constitution of direct entry garage units (disk drives). It features a dialogue of the evolution of the know-how (magnetic recording) and an evaluate of alternative garage applied sciences, together with optical recording. Examples of codes utilized in earlier implementations of disk drives in addition to an software of disk force utilization dictated by means of reliability issues also are incorporated. The presentation assumes a minimal wisdom of magnetic recording, servomechanism layout, and coding.

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1. Processes 106=1000000 p 800000 \ 600000 h 500000 400000 300000 [ 200000 105=100000 80000 60000 50 000 40000 30000 20000 _10 4 =10000 I 8000 1 6000 ^ £ -S 5000 4000 3000 IBM Data Storage Drive Model Number 1 r«m o> m ico O) O) 0> CO CO σ> 1 I I I I I I LO CD ο> hCD CT> 05 CO σ> I ir>o> I I I I I I 1 t^ m o> hrr^ O) o> o> I I I I 1 1 I I I I I 1 I T— CO o> CO CO o> m r^- σ> i- co CO CO GO O) O) 0 ) 0 ) 0 ) 0 ) 0 ) Year Fig. 1. Linear density B in bits/inch versus year of first customer shipment (FCS).

4. Write Read Isolated written transition and corresponding read-back pulse. indicated in Eq. 1). The end result is that the read pulse e0 looks very much like the first derivative of the transition M(x — x0). This is shown also in Fig. 4. 2. LINEAR SUPERPOSITION On readback, the existing magnetic field (that was caused by the recorded magnetization of the surface) is extremely weak, and hence, the magnetic read head will behave very nearly as a linear element. In this case, each pulse can be considered separately, and the composite readback waveform (as seen in an oscilloscope) consists of the addition of these separate, isolated pulses.

4. Write Read Isolated written transition and corresponding read-back pulse. indicated in Eq. 1). The end result is that the read pulse e0 looks very much like the first derivative of the transition M(x — x0). This is shown also in Fig. 4. 2. LINEAR SUPERPOSITION On readback, the existing magnetic field (that was caused by the recorded magnetization of the surface) is extremely weak, and hence, the magnetic read head will behave very nearly as a linear element. In this case, each pulse can be considered separately, and the composite readback waveform (as seen in an oscilloscope) consists of the addition of these separate, isolated pulses.

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