Dynamic track pitch control for shingled magnetic recording disc

Shingled magnetic recording (SMR) disk drives 10 are described that adjust track pitch or magnetic write width to compensate for external temperature effects. Track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined fr...

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Bibliographic Details
Main Authors HIROYASU TANABE, HIDEKI ZAITSU, NAOTO ITO, KYO AKAGI
Format Patent
LanguageEnglish
Published 22.01.2014
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:Shingled magnetic recording (SMR) disk drives 10 are described that adjust track pitch or magnetic write width to compensate for external temperature effects. Track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined from the drives' temperature sensor 17, in other embodiments track pitch is adjusted based on the magnetic write width (MWW) which is determined from read-back testing of previously written data tracks. In an alternative embodiment, the width of the MWW. is adjusted instead of the track pitch. The various factors that affect the MWW that can be used to increase or decrease the MWW, including write current characteristics and when available thermal-assistance parameters. The track pitch is increased when the temperature increases to prevent the increase in MWW with temperature from reducing the width of a previously written adjacent track below a target value.
Bibliography:Application Number: GB20130009314