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

By Hugh M. Sierra

This publication offers an exposition of the expertise, layout, association, and constitution of direct entry garage units (disk drives). It incorporates a dialogue of the evolution of the expertise (magnetic recording) and an review of alternative garage applied sciences, together with optical recording. Examples of codes utilized in previous implementations of disk drives in addition to an software of disk force utilization dictated by way of reliability concerns also are integrated. 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).

36) This frequency has been dubbed IF. In reality, the readback waveform, although looking like a perfect sinusoid, is not. This can be verified very easily by placing a spectrum analyzer at the output of the read head and noticing that there are a tremendous number of harmonics. Unfortun­ ately, the name (although not quite accurate) has persisted and is used all the time. 5. Fourier Components 51 Write waveform c Readback waveform Single sinusoid Fig. 26. Formation of the IF read waveform. case of alternate ones and zeros.

Instead of dealing in generalities, let us concentrate on one particular example and establish the methodology. Thereafter, it should be possible to apply the method to any particular application. Example. Let us consider a magnetic recording system having a bit window 4 microseconds wide. 26. shows a magnetic recording system in which the ones and zeros have been written in an alternate fashion. 5 KHz. 36) This frequency has been dubbed IF. In reality, the readback waveform, although looking like a perfect sinusoid, is not.

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