Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsKiyomi Ejiri, Minoru Sueki
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium having on a support at least two magnetic layers that include an uppermost magnetic layer for recording information and a lower magnetic layer for recording servo signals, wherein the uppermost magnetic layer has a coercive force Hc(U) [KA/m] at most 265 times as much as a saturated magnetic flux density Bs[T] of a recording head used for information recording and the lower magnetic layer has a coercive force Hc(L) [KA/m] at least 159 times as much as the saturated magnetic flux density Bs[T] of the recording head used for information recording, thereby ensuring highly accurate servo write and elevation of recording density.
Claims6
A magnetic recording medium comprising:
- a support;
- and
- at least two magnetic layers which include an uppermost magnetic layer for recording information and a lower magnetic layer for recording servo signals,
- wherein the uppermost magnetic layer has a coercive force Hc(U) [KA/m] at most 265 times as much as a saturated magnetic flux density Bs[T] of a recording head used for information recording, and the lower magnetic layer has a coercive force Hc(L) [KA/m] at least 159 times as much as the saturated magnetic flux density Bs[T] of the recording head used for information recording.
Dependencies are inferred from the claim text.