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1. 发明授权

US07051154B1 Caching data from a pool reassigned disk sectors 有权
标题翻译：从池缓存数据重新分配的磁盘扇区
公开(公告)号：US07051154B1
公开(公告)日：2006-05-23
申请号：US09620497
申请日：2000-07-20
申请人： YongPeng Chng , Chwee Fern Ee , Swee Kieong Choo , WeiLoon Ng
发明人： YongPeng Chng , Chwee Fern Ee , Swee Kieong Choo , WeiLoon Ng
IPC分类号： G06F12/02
CPC分类号： G06F12/0866
摘要： A method to improve drive read performance in a disc drive includes powering-up a disk drive, reading reassigned sectors data from a reassign spare pool, and storing the reassigned sectors data in a reassigned cache segment. This method also includes initiating a read request, detecting a reassigned sector within the read request, and determining whether the requested sector can be located in the reassignment cache. If the reassigned sectors are found in the cache, then the method includes transferring the reassigned sector data from the reassignment cache to the read buffer or directly to the requesting host computer. If the reassigned sectors are not found in the cache, then the method includes seeking to the reassignment spare pool to fetch as much reassigned sectors data as the reassignment cache can hold. In another embodiment, the reassigned sectors data stored in a reassignment cache segment is located in a buffer.
摘要翻译：一种提高磁盘驱动器的驱动器读取性能的方法包括加电磁盘驱动器，从重新分配的备用存储池读取重新分配的扇区数据，以及将重新分配的扇区数据存储在重新分配的高速缓存段中。该方法还包括启动读取请求，检测读取请求内的重新分配的扇区，以及确定所请求的扇区是否可以位于重新分配高速缓存中。如果在缓存中找到重新分配的扇区，则该方法包括将重新分配的扇区数据从重新分配缓存传送到读取缓冲器或直接传送到请求主机计算机。如果在高速缓存中没有找到重新分配的扇区，则该方法包括寻求重新分配备用池以在重新分配缓存可以保持时获取尽可能多的重新分配的扇区数据。在另一个实施例中，存储在重新分配高速缓存段中的重新分配的扇区数据位于缓冲器中。

2. 发明授权

US06560052B2 Implementation of variable bit density recording in storage disc drives 有权
标题翻译：在存储盘驱动器中实现可变位密度记录
公开(公告)号：US06560052B2
公开(公告)日：2003-05-06
申请号：US09351737
申请日：1999-07-12
申请人： Wei Loon Ng , Beng Wee Quak , Wing Hung Chan , Swee Kieong Choo , Choon Wei Ng , Teck Khoon Lim
发明人： Wei Loon Ng , Beng Wee Quak , Wing Hung Chan , Swee Kieong Choo , Choon Wei Ng , Teck Khoon Lim
IPC分类号： G11B509
CPC分类号： G11B20/1258 , G11B5/012 , G11B5/09 , G11B20/1816 , G11B27/105 , G11B2005/001 , G11B2220/20 , G11B2220/2516
摘要： The present invention pertains to an apparatus and method for recording data in a variable bit density disc drive. The disc drive includes a recording surfaces, each having a corresponding head for recording data on the recording surface. At least one head is operated at a different recording frequency from the other heads, creating a variable bit density for the different recording surfaces. The combination of head recording frequencies is determined following an error testing operation and a unique physdisc lookup table is created based on the determined recording frequencies. The physdisc lookup table is used to allocate data sectors and to convert between logical and physical block addresses.
摘要翻译：本发明涉及一种用于在可变位密度盘驱动器中记录数据的装置和方法。盘驱动器包括记录表面，每个记录表面具有用于在记录表面上记录数据的相应头部。至少一个头部以与其他头部不同的记录频率操作，为不同的记录表面创建可变位密度。头部记录频率的组合在误差测试操作之后确定，并且基于所确定的记录频率创建唯一的物理查找表。 physdisc查找表用于分配数据扇区，并在逻辑块和物理块地址之间进行转换。

3. 发明授权

US07000067B2 Virtual expansion of program RAM size 失效
公开(公告)号：US07000067B2
公开(公告)日：2006-02-14
申请号：US10334400
申请日：2002-12-30
申请人： Swee Kieong Choo , HuaYuan Chen
发明人： Swee Kieong Choo , HuaYuan Chen
IPC分类号： G06F12/00
CPC分类号： G06F9/4401 , G06F12/08
摘要： A method and apparatus for virtually expanding the rapid-access memory space of a device employing time-critical software modules and having various modes of operation. Each of the modes of operation of the device is identified. For each mode of operation, the time-critical software modules used during the mode are identified. The software modules used during all modes of operation are permanently stored in rapid-access memory. However, a software module that is used only during a particular mode of operation is loaded into the rapid-access memory unit only upon entry into the mode of operation in which it is used. The software module is loaded into a region of memory occupied by another software module not utilized during the particular mode of operation being entered.

4. 发明授权

US06690532B1 Self-diagnostic MR head recovery 有权
标题翻译：自诊断MR头恢复
公开(公告)号：US06690532B1
公开(公告)日：2004-02-10
申请号：US09539796
申请日：2000-03-31
申请人： Swee Kieong Choo , Jack Ming Teng , Hwee Peng Teo , Myint Ngwe , Beng Wee Quak , Kwee Teck Say
发明人： Swee Kieong Choo , Jack Ming Teng , Hwee Peng Teo , Myint Ngwe , Beng Wee Quak , Kwee Teck Say
IPC分类号： G11B2102
CPC分类号： G11B5/012 , G11B5/02
摘要： A method and apparatus for detecting and recovering from head instability in a magneto-resistive (MR) transducer head of a disc-drive system. A head-instability-recovery circuit is described for use in disc drive to recover from a head-instability condition of an MR transducer head. This circuit includes a controller and a current source that supplies current to the MR head. The current source is controlled to supply a nominal amount of current to the MR head when operating in a normal mode, and to supply one or more current bursts having a current above the nominal supply current in order to recover from the head-instability condition. Also described is a method for recovering from a transducer-instability condition of an MR transducer of a disc drive, including detecting a situation that indicates a head-instability-recovery operation is desired, and performing the head-instability-recovery operation.
摘要翻译：一种用于在盘驱动系统的磁阻（MR）换能器头中的头部不稳定性中检测和恢复的方法和装置。描述磁头不稳定性恢复电路用于磁盘驱动器以从MR换能器头的磁头不稳定状态恢复。该电路包括向MR磁头供应电流的控制器和电流源。控制电流源以在正常模式下工作时向MR磁头提供额定电流量，并且提供具有高于额定电源电流的电流的一个或多个电流脉冲串，以便从头部不稳定状态恢复。还描述了一种用于从盘驱动器的MR换能器的换能器不稳定状态恢复的方法，其包括检测指示头部不稳定性恢复操作期望的情况，以及执行头部不稳定性恢复操作。

5. 发明授权

US06636049B1 Disc drive power-up process including head mapping 失效
标题翻译：光盘驱动器启动过程包括头映射
公开(公告)号：US06636049B1
公开(公告)日：2003-10-21
申请号：US09553076
申请日：2000-04-20
申请人： Teck Khoon Lim , Swee Kieong Choo , Kok Hoe Chia , Song Wee Teo
发明人： Teck Khoon Lim , Swee Kieong Choo , Kok Hoe Chia , Song Wee Teo
IPC分类号： G01R3102
CPC分类号： G11B19/00 , G11B5/012 , G11B5/455 , G11B27/36 , G11B2005/0018 , G11B2220/20
摘要： A logical-to-physical head map is built upon each power up of a disc drive. After powering the controller and disc drive spindle motor, a bias current is iteratively supplied to the read heads in succession. A representation of the voltage across each read head is stored in a fault register for comparison to a threshold and a “good” or “bad” fault status is stored for each head. A logical-to-physical head map is defined based on the number of logical heads, which in turn is based on the disc drive serial number. Each of the logical heads in the logical-to-physical head map is associated to a respective one of the heads having a “good” fault status to construct the logical-to-physical head map in the controller memory.
摘要翻译：每个磁盘驱动器上电后，建立逻辑到物理磁头映射。在给控制器和磁盘驱动器主轴电机供电之后，将偏置电流依次迭代地提供给读取头。每个读取头上的电压的表示被存储在故障寄存器中用于与阈值进行比较，并且为每个头部存储“良好”或“坏”故障状态。基于逻辑头的数量来定义逻辑到物理头映射，逻辑头依次是基于盘驱动器序列号。逻辑到物理头映射中的每个逻辑头与具有“良好”故障状态的相应头之一相关联，以构成控制器存储器中的逻辑到物理头映射。

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