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Tape debris buildup prevention using staggered stop positions

IP.com Disclosure Number: IPCOM000129132D
Original Publication Date: 2005-Sep-28
Included in the Prior Art Database: 2005-Sep-28
Document File: 1 page(s) / 24K

Publishing Venue

IBM

Abstract

Disclosed is a method to prevent debris accumulation onto tape medium. If a tape motion is stopped at a same position repeatedly many times, debris would be accumulated on the position and it may create a read problem. Staggering tape stop position can prevent this problem.

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Tape debris buildup prevention using staggered stop positions

If a tape motion is stopped at a tape position on tape repeatedly many times, it creates a risk to accumulate debris on the position. That debris would be an obstacle to read data written on the tape region, so that a read problem may be caused by this. Especially if a tape region is segmented as shown in Figure 1, tape motion will stop on a same position of the segmented region boundary. If a gap between the segmented region has not enough space to decelerate/accelerate tape speed for read/write operation, the stop position is beyond the gap and debris would be accumulated on the data region. If the stop position is same every time, the debris accumulation would be systematically created.

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Figure 1

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To eliminate the debris accumulation, change the stop position sequentially as described below.

If a stop request of tape motion is required and the estimated stop position is on the systematic accumulated region, change the stop position based on below sequence.

If M is the minimum stop position, and N is the maximum stop position and an interval of I, use the stop sequence of:

N, N-1*I, N-2*I, ... M+2*I, M+1*I, M, then back to N.

The start position could be random (generated on load), or start at the farthest location
(N).

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