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US 7,199,957 B2Granted
Write head alignment for full amplitude time-based servo
AssigneeImation Corp.
InventorsStephen J. Rothermel, Richard E. Jewett
Life of this patent
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AssigneeImation Corp.
InventorsStephen J. Rothermel, Richard E. Jewett
Estimating the term…
The invention is directed to a servo writing apparatus having accurate alignment of write gaps of servo write heads. In particular, the write gaps substantially align in a servo channel corresponding to a servo band of a magnetic data storage tape. The servo band is fully magnetized (a.k.a. DC erased) in one direction by a direct current (DC) magnetic field across the write gap of one of the servo write heads. Time-based servo markings magnetized in a second direction are recorded on the fully magnetized servo band by a pulsed magnetic field across the write gaps of the other servo write head. The servo write heads may be mounted in a mounting structure within the servo writing apparatus. Maintaining a large mounting structure width to servo write head separation distance ratio improves write gap alignment accuracy, which assures full servo signal strength across the servo band without magnetizing adjacent data bands.
A system comprising:
A method comprising aligning a first write gap of a first servo write head that substantially magnetizes magnetic particles of magnetic tape in a first direction and one or more second write gaps of a second servo write head that are arranged to define a time-based servo pattern magnetized in a second direction on the magnetic tape by translating and rotating the first and second servo write heads, wherein the first write gap and the second write gaps define a servo channel corresponding to a servo band on the magnetic tape and the first write gap and the second write gaps are aligned in the servo channel to within less than 10 micrometers.
Dependencies are inferred from the claim text.