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Tape Bar-Chart Explanation
The tape bar-chart
showing how much tape has been written, and the other showing how much
tape has been read. When selected from the menu, these bars are shown during
read and write operations, and when drive is in Ready (idle) mode. The bar
display alternates with the Write, Read, or Ready display, depending on the
present mode of the drive.
Media Information Region
The bar gets its information from the MIR (Media Information Region) on the
tape. This information is written to tape when the tape is unloaded. If this
information is bad, the bar will not display. To rewrite the MIR information, the
host must read the entire tape and then unload it.
Displayed Bars
The displayed bars use all ten display segments on the operator panel. Each
segment is usually employed to display a number, letter, or symbol, but in "Bar
Mode," all ten segments are used together to display the horizontal bars.
Segment
Each segment has seven vertical dots and five horizontal dots. There are fifty
dots the entire length of the display, so that each dot represents 2% travel and
each segment represents 10% travel of the bars. Please see next page.
Dots
The three rows of dots in the middle of the display represent the read bar and
the two outer rows of dots on each side represent the write bar. However,
where the read bar has not penetrated, the write bar takes up all the rows. See
Figure
Write Bar
The write bar is in the shaded area. It has a matrixed pattern: only every other
dot is lighted. It shows that the tape is 50% written.
Read Bar
The read bar is inside the write bar in the unshaded area to the left. The bar
shows up as an unlit single row lined with a solid-lighted row on each side. It
shows that the tape is 24% read.
95739
(Figure 4-9 on page
4-9.
Ninth Edition
Tape Bar-Chart Explanation
4-32) displays two horizontal bars, one
4-31
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