Browse Prior Art Database

THERMAL ASPERITY CONTROL FOR L/UL FILES

IP.com Disclosure Number: IPCOM000013493D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 25K

Publishing Venue

IBM

Abstract

Described is a method for how the head disk interface can be made more reliable in a file with a load/unload (L/UL) mechanism by a specific load sequence. The load operation may only be followed by a seek toward the data cylinders close to the outer diameter (OD) of the disk. In this case, only a small part of the disk data zone is swept by the sliders during the L/UL sequence. This gives the opportunity to leave ramp or disk debris resulting from the L/UL and sweep actions on the disk at the radius corresponding to the edge of the sweep. The debris left at the boundary may lead the development of "new" thermal asperities (TA) when the sliders are accessed across the debris.

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THERMAL ASPERITY CONTROL FOR L/UL FILES

   Described is a method for how the head disk interface can be made more
reliable in a file with a load/unload (L/UL) mechanism by a specific load
sequence. The load operation may only be followed by a seek toward the data
cylinders close to the outer diameter (OD) of the disk. In this case, only a
small part of the disk data zone is swept by the sliders during the L/UL
sequence. This gives the opportunity to leave ramp or disk debris resulting from
the L/UL and sweep actions on the disk at the radius corresponding to the edge
of the sweep. The debris left at the boundary may lead the development of "new"
thermal asperities (TA) when the sliders are accessed across the debris.

One way to eliminate this TA exposure is to move the sliders to the inner
diameter (ID) crash stop during each load cycle. This will then force the
sliders to sweep across the whole data zone and the potential debris deposition
will occur outside the data zone. Hence, the slider will never fly over the
collected debris thus eliminating TA exposure.

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