Magnetic tape apparatus
A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35, the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
1. A magnetic tape apparatus comprising:
a magnetic tape;
a reading element unit; and
an extraction unit,
wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,
the coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35,
the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,
the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and
parts of the plurality of reading elements are overlapped each other in a running direction of the magnetic tape.
2. The magnetic tape apparatus according to claim 1 ,
wherein the specific track region is a region including the reading target track and adjacent tracks which are adjacent to the reading target track, and
each of the plurality of reading elements straddles over both of the reading target track and the adjacent track, in a case where a positional relationship with the magnetic tape is changed.
3. The magnetic tape apparatus according to claim 1 ,
wherein the plurality of reading elements are disposed in a line in a state of being adjacent to each other, in a width direction of the magnetic tape.
4. The magnetic tape apparatus according to claim 1 ,
wherein the plurality of reading elements fall in the reading target track in a width direction of the magnetic tape.
5. The magnetic tape apparatus according to claim 2 ,
wherein the waveform equalization process is performed by using a tap coefficient determined in accordance with the deviation amount.
6. The magnetic tape apparatus according to claim 5 ,
wherein, regarding each of the plurality of reading elements, a ratio between an overlapping region with the reading target track and an overlapping region with an adjacent track which is adjacent to the reading target track is specified from the deviation amount, and the tap coefficient is determined in accordance with the specified ratio.
7. The magnetic tape apparatus according to claim 3 ,
wherein the waveform equalization process is performed by using a tap coefficient determined in accordance with the deviation amount.
8. The magnetic tape apparatus according to claim 7 ,
wherein, regarding each of the plurality of reading elements, a ratio between an overlapping region with the reading target track and an overlapping region with an adjacent track which is adjacent to the reading target track is specified from the deviation amount, and the tap coefficient is determined in accordance with the specified ratio.
9. The magnetic tape apparatus according to claim 4 ,
wherein the waveform equalization process is performed by using a tap coefficient determined in accordance with the deviation amount.
10. The magnetic tape apparatus according to claim 9 ,
wherein, regarding each of the plurality of reading elements, a ratio between an overlapping region with the reading target track and an overlapping region with an adjacent track which is adjacent to the reading target track is specified from the deviation amount, and the tap coefficient is determined in accordance with the specified ratio.
11. The magnetic tape apparatus according to claim 1 ,
wherein the deviation amount is determined in accordance with a result obtained by reading a servo pattern applied to the magnetic tape in advance, by a servo element.
12. The magnetic tape apparatus according to claim 11 ,
wherein a reading operation by the reading element unit is performed synchronously with a reading operation by the servo element.
13. The magnetic tape apparatus according to claim 1 ,
wherein the extraction unit includes a two-dimensional FIR filter, and the two-dimensional FIR filter composes each result obtained by performing the waveform equalization process with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
14. The magnetic tape apparatus according to claim 1 ,
wherein the plurality of reading elements are a pair of reading elements.
15. The magnetic tape apparatus according to claim 1 ,
wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.10 to 0.35.
16. A magnetic tape apparatus comprising:
a magnetic tape;
a reading element unit; and
an extraction unit,
wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,
the coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35,
the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,
the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and
the waveform equalization process is performed by using a tap coefficient determined in accordance with the deviation amount.
17. The magnetic tape apparatus according to claim 16 ,
wherein, regarding each of the plurality of reading elements, a ratio between an overlapping region with the reading target track and an overlapping region with an adjacent track which is adjacent to the reading target track is specified from the deviation amount, and the tap coefficient is determined in accordance with the specified ratio.