Browse Prior Art Database

Diskette Drive Test System Using Magnetic Index Mark

IP.com Disclosure Number: IPCOM000047319D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Askew, JC: AUTHOR [+2]

Abstract

The flexible disk spindle drive in a diskette drive is tested by reading a magnetic index mark from a track on the flexible disk in the diskette. Typically, the disk has an index hole which is sensed optically. In the present system there is no index hole; instead, there is an index mark magnetically coded in each track. The test system is programmable to recognize the serial pattern of the index mark. The system can check for spindle speed, spindle belt slippage, slippage between the flexible disk and the spindle, and incorrect ratio between the spindle pulley and the motor pulley. The heart of the test system is a microprocessor and memory 10. The microprocessor is controlled by the operator working with an IBM 3101 terminal 12. Terminal 12 includes a cathode ray tube display and a keyboard.

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Diskette Drive Test System Using Magnetic Index Mark

The flexible disk spindle drive in a diskette drive is tested by reading a magnetic index mark from a track on the flexible disk in the diskette. Typically, the disk has an index hole which is sensed optically. In the present system there is no index hole; instead, there is an index mark magnetically coded in each track. The test system is programmable to recognize the serial pattern of the index mark. The system can check for spindle speed, spindle belt slippage, slippage between the flexible disk and the spindle, and incorrect ratio between the spindle pulley and the motor pulley. The heart of the test system is a microprocessor and memory 10. The microprocessor is controlled by the operator working with an IBM 3101 terminal 12. Terminal 12 includes a cathode ray tube display and a keyboard. The diskette drive is attached to microprocessor 10 through attachment logic 16. A programmable serial pattern detector 18 monitors the read channel from the diskette drive to detect the presence of the index mark. The serial bit pattern of the index mark will vary from disk to disk. Accordingly, the serial pattern used by detector 18 is under program control. The operator keys in the desired serial number for the index mark at terminal 12. Microprocessor 10 generates the serial bit pattern and supplies it to detector 18. Microprocessor 10 controls diskette drive 14 during the test. During an index mark read operation, th...