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1. WO2004095435 - BANDE MAGNETIQUE DOUBLE FACE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A magnetic tape for storing digital data comprising:
a first side of the magnetic tape coated with a first side magnetic coating, the first side magnetic coating operative to have data recorded thereon; and a second side of the magnetic tape opposite the first side, the second side coated with a second side magnetic coating, the second side magnetic coating operative to have data recorded thereon;
wherein each of the first side magnetic coating and the second side magnetic coating having a set coercivity;
wherein data is recorded on the magnetic tape first side to have a fringing field strength no greater than one half the set coercivity of the second side; and
wherein data is recorded on the magnetic tape second side to have a fringing field strength no greater than one half the set coercivity of the first side.

2. A magnetic tape for storing digital data as in claim 1 wherein the set coercivity is at least 1800 Oe.

3. A magnetic tape for storing digital data as in claim 1 wherein each of the first side magnetic coating and the second side magnetic coating has a remanence of not more than 600 memu/cm3.

4. A magnetic tape for storing digital data as in claim 1 wherein each of the first side magnetic coating and the second side magnetic coating is not greater than 120 nm in thickness.

5. A magnetic tape for storing digital data as in claim 1 wherein each of the first side magnetic coating and the second side magnetic coating has a magnetic strength not greater than 6 memu/cm2.

6. A magnetic tape for storing digital data as in claim 1 wherein each of the first side magnetic coating and the second side magnetic coating has a coercive squareness CS of at least 0.7, the coercive squareness defined as
aH„ - M.
CS
aH

with a a slope dMldH of a hysteresis loop for the magnetic coating measured at coercivity Hc and with Mτ a remanence of the magnetic coating at H = 0.

7. A magnetic tape for storing digital data as in claim 1 wherein each of the first side magnetic coating and the second side magnetic coating has a remanent squareness RS of at least 0.7, the remanent squareness defined as

RS =
M s

with Mr a remanence of the magnetic coating at H = 0 and Ms is the saturation magnetization.

8. A system for recording data comprising:
a magnetic tape recordable on both a first side and a second side, each of the first side and the second side coated with a material having a set coercivity;
a first record module for recording data on the first side;
a second record module for recording data on the second side; and at least one hub operative to wind the magnetic tape in a tape pack with the first side in contact with the second side;
wherein data is recorded on the first side and data is recorded on the second side to have a field strength no greater than one half the set coercivity.

9. A system for recording data as in claim 8 wherein the set coercivity is at least 1800 Oe.

10. A system for recording data as in claim 8 wherein the material coating each of the first side and the second side has a remanence not more than 600 memu/cm3.

11. A system for recording data as in claim 8 wherein the material coating each of the first side and the second side is not greater than 120 nm in thickness.

12. A system for recording data as in claim 8 wherein the material coating each of the first side and the second side has a magnetic strength not greater than 6 memu/cm2.

13. A system for recording data as in claim 8 wherein the material coating each of the first side and the second side has a coercive squareness CS of at least 0.7, the coercive squareness defined as
aH„ - M,
CS =
aH

with a a slope dMldH of a hysteresis loop for the material coating each of the first side and the second side measured at coercivity Hc and with Mr a remanence of the material coating each of the first side and the second side at H = 0.

14. A system for recording data as in claim 8 wherein the material coating each of the first side and the second side has a remanent squareness RS of at least 0.7, the remanent squareness defined as

RS =
M.

with Mr a remanence of the material coating each of the first side and the second side at H == 0 and Ms is the saturation magnetization.