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Multiplexed Data Detection System for Multiple Disk Drives

IP.com Disclosure Number: IPCOM000080201D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Shidler, KA: AUTHOR

Abstract

This system transmits limited data (data in the form of rectangular waves) derived from magnetic disks 10 and 12 directly over a file interface 14 and multiplexes the limited data from the two disks 10 and 12. This arrangement requires only one data detector 16 for a plurality of disk drives, and only one interface line 18, one line driver 20 and one line receiver 22 for each disk drive. The data detector 16 is of type which requires a clock signal to be supplied to it from variable-frequency oscillator (VFO) 32. Prior systems included a data detector for each disk drive, and a clock signal from VFO 32 or equivalent had to be transmitted back to each disk drive.

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Multiplexed Data Detection System for Multiple Disk Drives

This system transmits limited data (data in the form of rectangular waves) derived from magnetic disks 10 and 12 directly over a file interface 14 and multiplexes the limited data from the two disks 10 and 12. This arrangement requires only one data detector 16 for a plurality of disk drives, and only one interface line 18, one line driver 20 and one line receiver 22 for each disk drive. The data detector 16 is of type which requires a clock signal to be supplied to it from variable-frequency oscillator (VFO) 32. Prior systems included a data detector for each disk drive, and a clock signal from VFO 32 or equivalent had to be transmitted back to each disk drive.

Disk 10 has magnetic head 24 positioned for reading data, and head 24 is connected with disk drive electronics containing differentiator 26 connected to limiter 28 which, in turn, is connected to driver 20. Disk drive 2 electronics is connected with head 24a for disk 12 in the same manner as disk drive 1 electronics is connected with head 24, and includes differentiator 26a, limiter 28a and driver 20a which correspond to the parts 26, 28 and 20 in disk drive 1. Receivers 22 and 22a are connected to data multiplex logic 30, which provides output to data detector 16. Data detector 16 supplies data to VFO 32 which produces separated data as its output, separated data constituting binary 1's and 0's separated from any clocking information.

Differentia...