Reader fly height control for head burnishing mitigation
AssigneeSeagate Technology LLC
InventorsXiong Liu, Quan Li, Li Hong Zhang
Life of this patent
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Abstract
A storage device includes a controller that determines a degree of data degradation for a data track targeted by a pending read command and sets a head/media clearance parameter for execution of the read command based on the determined degree of data degradation for the data track, the head/media clearance parameter providing for a greater head-media separation when the determined level of degradation is lower than when the determined level of degradation is higher.
Claims12
A method comprising:
- incrementing a counter for a data track each time an adjacent track is written;
- determining a count value of the counter for the data track, the count value being indicative of a current degree of data degradation on a data track that is due to adjacent track interference (ATI);
- querying a look-up table with the count value to retrieve a head/media clearance parameter;
- and
- adjusting a fly height setting for a read operation of the data track based on the retrieved head/media clearance parameter, the fly height setting being adjusted to provide greater head-media separation when the current degree of data degradation on the data track is lower than when the current degree of data degradation on the data track is comparatively higher.
A storage device comprising:
- a counter configured to increment a count value for a data track each time an adjacent track is written, the count value being indicative of a current degree of data degradation on the data track that is due to adjacent track interference (ATI);
- a track degradation monitor configured to determine the count value for the data track;
- and
- a reader fly height controller configured to:
- query a look-up table with the count value to retrieve a head/media clearance parameter;
- and
- adjust a fly height setting for a read operation of the data track based on the retrieved head/media clearance parameter, the fly height setting being adjusted to provide greater head-media separation when the current degree of data degradation on the data track is lower than when the current degree of degradation on the data track is comparatively higher.
One or more non-transitory computer-readable storage media encoding computer-executable instructions for executing a computer process comprising:
- incrementing a counter for a data track each time an adjacent track is written;
- determining a count value of the counter for the data track, the count value being indicative of a current degree of data degradation on the data track that is due to adjacent track interference (ATI);
- querying a look-up table with the count value to retrieve a head/media clearance parameter;
- and
- adjusting a fly height setting for a read operation of the data track based on the retrieved head/media clearance parameter, the fly height setting being adjusted to provide greater head-media separation when the current degree of data degradation on the data track is lower than when the current degree of data degradation on the data track is comparatively higher.
Dependencies are inferred from the claim text.