Servo track magnetic recording head for pre-erasing magnetic tape
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United States of America Patent
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Aug 18, 2009
Grant Date -
Feb 14, 2008
app pub date -
Aug 13, 2007
filing date -
Jan 30, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to those servo recordings which were written with a uni-polar current waveform. The DC pre-erase is performed using a uni-polar direct current of a polarity that is opposite to the polarity of the direct current used to write the servo data. This pre-erase may be done with one or more heads. Also, as will be described, the pre-erase of a servo channel and writing to a servo channel may be done by making two passes over a single head or by using two or more heads to perform both steps. Also, it is within the scope of the present invention to have the heads mounted on a single mount or have the heads on separate mounts and on separate tape decks.
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