发明名称 |
Magnetic recording apparatus |
摘要 |
A method of enhancing the thermal stability of gray codes is disclosed. The gray code block in a servo area is recorded with a combination of two different magnetization directions. When the two different magnetization directions are expressed as "+" and "-", the information "1" is recorded as "++--" or "--++" with the information "0" recorded as "+-+-" or "-+-+". Since the filter for gray code demodulation is provided with a perpendicular recording mode, the servo area does not use long-wavelength signals that are susceptible to thermal demagnetization. As a result, thermal stability is enhanced.
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申请公布号 |
US2003223147(A1) |
申请公布日期 |
2003.12.04 |
申请号 |
US20020231264 |
申请日期 |
2002.08.30 |
申请人 |
NISHIDA YASUTAKA;HAMAGUCHI TAKEHIKO;SAWAGUCHI HIDEKI |
发明人 |
NISHIDA YASUTAKA;HAMAGUCHI TAKEHIKO;SAWAGUCHI HIDEKI |
分类号 |
G11B5/00;G11B5/012;G11B5/09;G11B5/596;G11B20/10;G11B27/30;(IPC1-7):G11B5/596 |
主分类号 |
G11B5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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