1. Introduction
In order to survive as a data recording system the areal
data density of tape must increase significantly. Today, the
best linear tape systems have data densities of the order of
200 Mb/in.2, whereas, to remain competitive, densities of
greater than 2 Gb/in.2 must be attained in the next few years.
In spite of various measures taken by the industry [1],
physical spacing between head and tape remains a major
factor in signal degradation and error growth and
subsequently this effect limits attainable storage density.
Thus, significant increase in densities can only be attained by
minimising physical spacing between media and sensors
(pole tips). The major causes of this spacing (and hence
spacing losses) are Pole Tip Recession (PTR) and transferred
materials from tapes to heads (stains) [2–5]. The mechanisms
responsible for these effects have been isolated by Sullivan
and co-workers [6–8] and Bhushan [2,3].
Comparison of the LTO and Travan5 systems for what is
essentially the same MP tape allows the effects of contact
pressure at the head tape interface on PTR and stain to be
studied in detail. The radius of curvature of the contact
region of LTO heads is greater than that of Travan5 heads
leading to a reduction of over three times in contact
1. Introduction
In order to survive as a data recording system the areal
data density of tape must increase significantly. Today, the
best linear tape systems have data densities of the order of
200 Mb/in.2, whereas, to remain competitive, densities of
greater than 2 Gb/in.2 must be attained in the next few years.
In spite of various measures taken by the industry [1],
physical spacing between head and tape remains a major
factor in signal degradation and error growth and
subsequently this effect limits attainable storage density.
Thus, significant increase in densities can only be attained by
minimising physical spacing between media and sensors
(pole tips). The major causes of this spacing (and hence
spacing losses) are Pole Tip Recession (PTR) and transferred
materials from tapes to heads (stains) [2–5]. The mechanisms
responsible for these effects have been isolated by Sullivan
and co-workers [6–8] and Bhushan [2,3].
Comparison of the LTO and Travan5 systems for what is
essentially the same MP tape allows the effects of contact
pressure at the head tape interface on PTR and stain to be
studied in detail. The radius of curvature of the contact
region of LTO heads is greater than that of Travan5 heads
leading to a reduction of over three times in contact
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