G11B 20/1883
Methods for assignment of alternate areas for defective areas
Official title: {Methods for assignment of alternate areas for defective areas}
G11B20/1883 (Methods for assignment of alternate areas for defective areas) appears on 1,607 US grants and 1,314 published applications in this corpus.
Search patents in G11B- Granted patents
- 1,607
- Published applications
- 1,314
- Assignees
- 238
- Inventors
- 1,740
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 11 | 0 |
| 1989 | 18 | 0 |
| 1990 | 16 | 0 |
| 1991 | 13 | 0 |
| 1992 | 18 | 0 |
| 1993 | 16 | 0 |
| 1994 | 25 | 0 |
| 1995 | 22 | 0 |
| 1996 | 26 | 0 |
| 1997 | 19 | 0 |
| 1998 | 41 | 0 |
| 1999 | 41 | 0 |
| 2000 | 35 | 0 |
| 2001 | 62 | 31 |
| 2002 | 57 | 54 |
| 2003 | 70 | 68 |
| 2004 | 66 | 146 |
| 2005 | 46 | 115 |
| 2006 | 87 | 160 |
| 2007 | 84 | 141 |
| 2008 | 115 | 224 |
| 2009 | 117 | 77 |
| 2010 | 123 | 46 |
| 2011 | 104 | 40 |
| 2012 | 83 | 33 |
| 2013 | 47 | 27 |
| 2014 | 40 | 20 |
| 2015 | 38 | 22 |
| 2016 | 32 | 29 |
| 2017 | 25 | 18 |
| 2018 | 18 | 11 |
| 2019 | 15 | 16 |
| 2020 | 18 | 9 |
| 2021 | 10 | 6 |
| 2022 | 10 | 8 |
| 2023 | 4 | 6 |
| 2024 | 6 | 5 |
| 2025 | 3 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Magnetic disk device13 Jan 2026US 12,525,252 B2Kabushiki Kaisha Toshiba
- Simple nonautonomous peering media clone detection25 Nov 2025US 12,481,729 B2Warner Bros. Entertainment Inc.
- Method and magnetic disk apparatus1 Jul 2025US 12,347,456 B1Kabushiki Kaisha Toshiba
- Magnetic disk device and method of managing parity4 Mar 2025US 12,243,558 B2Kabushiki Kaisha Toshiba
- Selective hard and soft rewrites22 Oct 2024US 12,124,740 B2International Business Machines Corporation
- Magnetic disk device and data recording method24 Sep 2026US 2026/0290397 A1Kabushiki Kaisha Toshiba
- Magnetic disk device25 Dec 2025US 2025/0391426 A1Kabushiki Kaisha Toshiba
- Magnetic disk device and method of managing parity26 Sep 2024US 2024/0321314 A1Kabushiki Kaisha Toshiba
- Magnetic disk device and method19 Sep 2024US 2024/0312485 A1Kabushiki Kaisha Toshiba
- Selective hard and soft rewrites11 Jul 2024US 2024/0231683 A9International Business Machines Corporation
Most cited
By later US patents
- Virtual addressing of optical storage media as magnetic tape equivalents575US 5,455,926 AData/Ware Development, Inc. · 1995
- Disk array apparatus and method which supports compound raid configurations and spareless hot sparing424US 5,479,653 ADellusa, L.P. · 1995
- Flash memory with targeted read scrub algorithm346US 9,053,808 B2SanDisk Technologies LLC · 2015
- Method of managing defective sectors in a disk-shaped information recording medium and an apparatus for performing the same283US 5,111,444 AMatsushita Electric Industrial Co., Ltd. · 1992
- Memory disk and apparatus for recording information on memory disk239US 5,058,089 AKabushiki Kaisha Toshiba · 1991