Browse Prior Art Database

Allow Maximum Data Buffer Size by Drive

IP.com Disclosure Number: IPCOM000122833D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Kibashi, A: AUTHOR [+4]

Abstract

Disclosed is a method to allow maximum data buffer size by drive for high performance. DRAM on hard disk drive is used for data buffer to store user data, micro code, and defect map. Drive performance depends on data buffer size considerably, however, defect map size is getting bigger according to capacity increase. In order to allow for maximum data buffer size, a manufacturing process defines data buffer size by adjusting the defect map size for each drive and/or its capacity.

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Allow Maximum Data Buffer Size by Drive

      Disclosed is a method to allow maximum data buffer size by
drive for high performance.  DRAM on hard disk drive is used for data
buffer to store user data, micro code, and defect map.  Drive
performance depends on data buffer size considerably, however, defect
map size is getting bigger according to capacity increase.  In order
to allow for maximum data buffer size, a manufacturing process
defines data buffer size by adjusting the defect map size for each
drive and/or its capacity.

      The manufacturing process scans all surface-to-map defective
sectors, and calculates necessary defect map size.  Then maximum data
buffer size is defined for each drive, and the size is saved to a
non-volatile memory or reserved area on the drive.  The drive loads
the data buffer size when power is on, and the user data is stored to
the data buffer effectively.

      The Figure shows the example of DRAM mapping in comparison with
and without this method.