Shingled magnetic recording disk drive with minimization of the effect of far track erasure on adjacent data bands
US8537481B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2012 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Apr 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1298
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A shingled magnetic recording (SMR) hard disk drive (HDD) essentially eliminates the effect of far track erasure (FTE) in the boundary regions of annular data bands caused by writing in the boundary regions of adjacent annular data bands. The extent of the FTE effect is determined for each track within a range of tracks of the track being written. Based on the relative FTE effect for all the tracks in the range, a count increment (CI) table or a cumulative count increment (CCI) table is maintained for all the tracks in the range. For every writing to a track in a boundary region, a count for each track in an adjacent boundary region, or a cumulative count for the adjacent boundary region, is increased. When the count reaches a predetermined threshold the data is read from that band and rewritten to the same band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.