By Hugh M. Sierra
This ebook offers an exposition of the expertise, 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 overview of alternative garage applied sciences, together with optical recording. Examples of codes utilized in previous implementations of disk drives in addition to an program of disk force utilization dictated through reliability concerns also are incorporated. The presentation assumes a minimal wisdom of magnetic recording, servomechanism layout, and coding.
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It is seen that in Fig. , due to the lack of neighboring pulse interference, the undesirable bit shift has been eliminated. As an added bonus, if this slimming down is done by a great amount (more than needed just to eliminate bit shift), the magnetic recording density could even be increased. This pulse slimming can be done by means of a network, as shown schematically in Fig. 20. where the input pulse has been narrowed down by a factor K (larger than 1, of course). This network can be specified in the frequency domain also.
And consider the same input and output pulses. 31) 4K2)' A graph of Eqs. 31) is given in Fig. 24. Let us consider the frequency a>e at which the magnitudes of the input and output are equal. 32) A graph of Eq. 32) is given in Fig. 25. i w K ^ - - ^ y— χ^ — |F 0 (j«)| 1 ~δ lF,(j<-)l ^ Χ ^ / ^ · ^ ^ ^e Fig. 24. Magnitude function of the input and output pulses. 4. Equalization c (Ό (0 V2 Fig. 25. Graph of we versus K. 33) Let us now consider the case where the network does not compress the pulse at all, that is, let us make K = l.
18. When this is done, Fig. 17. will be converted to Fig. 19. It is seen that in Fig. , due to the lack of neighboring pulse interference, the undesirable bit shift has been eliminated. As an added bonus, if this slimming down is done by a great amount (more than needed just to eliminate bit shift), the magnetic recording density could even be increased. This pulse slimming can be done by means of a network, as shown schematically in Fig. 20. where the input pulse has been narrowed down by a factor K (larger than 1, of course).
An Introduction to Direct Access Storage Devices by Hugh M. Sierra