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Process for Recording Disk File Servo

IP.com Disclosure Number: IPCOM000051848D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Day, RC: AUTHOR

Abstract

In a track following servo system using a rotary actuator, a wide read head is used to read multiple servo tracks and compare the outside tracks for centering. The present process takes advantage of the nature of a rotary actuator to precisely position the rotary arm and write the narrow tracks with the wide read head. Step 1 Mount a positioning tool, as shown in Fig. 1, to the rotary arm to be recorded. Step 2 Bring the disk up to normal operating temperature. Step 3 Position the servo head to the first tracks. Step 4 Record the first track using standard servo track writing equipment. Step 5 Advance the tool to the next position. The tool should be designed so that the head will be positioned over two-thirds of the track just written (if a 3 to 1 ratio of servo track width to data track width is being used).

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Process for Recording Disk File Servo

In a track following servo system using a rotary actuator, a wide read head is used to read multiple servo tracks and compare the outside tracks for centering. The present process takes advantage of the nature of a rotary actuator to precisely position the rotary arm and write the narrow tracks with the wide read head. Step 1 Mount a positioning tool, as shown in Fig. 1, to the rotary arm to be recorded. Step 2 Bring the disk up to normal operating temperature. Step 3 Position the servo head to the first tracks. Step 4 Record the first track using standard servo track writing equipment. Step 5 Advance the tool to the next position. The tool should be designed so that the head will be positioned over two-thirds of the track just written (if a 3 to 1 ratio of servo track width to data track width is being used). Step 6 Record the second track using standard servo track writing equipment. Step 7 Advance the tool to the next position. The head will now overlap one-third of the first track recorded and two-thirds of the second. Step 8 Record the third track using standard servo track writing equipment. Step 9 Repeat this process until all desired tracks have been recorded. Step 10 Advance the tool to a position one servo track width beyond the last track desired, which will then be two thirds overlapped Step 11 Erase the overlapped two tracks previously written. All narrow servo tracks are now recorded.

Use of a rotary actuator pe...