Position feedback system for volume holographic storage media
    1.
    发明授权
    Position feedback system for volume holographic storage media 失效
    体积全息存储介质的位置反馈系统

    公开(公告)号:US5777760A

    公开(公告)日:1998-07-07

    申请号:US644810

    申请日:1996-05-10

    摘要: A method of holographic recording in a photorefractive medium wherein stored holograms may be retrieved with maximum signal-to noise ratio (SNR) is disclosed. A plurality of servo blocks containing position feedback information is recorded in the crystal and made non-erasable by heating the crystal. The servo blocks are recorded at specific increments, either angular or frequency, depending whether wavelength or angular multiplexing is applied, and each servo block is defined by one of five patterns. Data pages are then recorded at positions or wavelengths enabling each data page to be subsequently reconstructed with servo patterns which provide position feedback information. The method of recording data pages and servo blocks is consistent with conventional practices. In addition, the recording system also includes components (e.g. voice coil motor) which respond to position feedback information and adjust the angular position of the reference angle of a reference beam to maximize SNR by reducing crosstalk, thereby improving storage capacity.

    摘要翻译: 公开了一种在光折射介质中的全息记录方法,其中可以以最大信噪比(SNR)来检索存储的全息图。 包含位置反馈信息的多个伺服块被记录在晶体中,并且通过加热晶体使其不可擦除。 根据是否应用波长或角复用,伺服块以特定的增量(角度或频率)进行记录,并且每个伺服块由五种模式之一定义。 然后在位置或波长记录数据页面,使得能够随后使用提供位置反馈信息的伺服模式来重构每个数据页面。 记录数据页和伺服块的方法与传统做法一致。 此外,记录系统还包括响应于位置反馈信息并调整参考光束的参考角度的角位置的组件(例如音圈电机),以通过减少串扰来最大化SNR,从而提高存储容量。

    Method of self-servo writing in a disk drive using multiple timing windows
    2.
    发明授权
    Method of self-servo writing in a disk drive using multiple timing windows 有权
    使用多个定时窗口在磁盘驱动器中自写入的方法

    公开(公告)号:US07375918B1

    公开(公告)日:2008-05-20

    申请号:US11413416

    申请日:2006-04-27

    IPC分类号: G11B5/596

    摘要: A disk drive includes a head and a disk, spiral patterns are located on the disk, and the disk drive self-writes servo patterns on the disk using the spiral patterns as a reference for servoing the head. In an embodiment, the disk drive uses preliminary servo patterns to determine repeatable runout of the spiral patterns. In another embodiment, the disk drive reads each spiral pattern with multiple timing windows.

    摘要翻译: 磁盘驱动器包括磁头和磁盘,螺旋图案位于磁盘上,磁盘驱动器使用螺旋图案自动写入磁盘上的伺服模式作为伺服磁头的参考。 在一个实施例中,磁盘驱动器使用初步伺服模式来确定螺旋图案的可重复跳动。 在另一个实施例中,磁盘驱动器以多个定时窗口读取每个螺旋图案。

    Method of self-servo writing in a disk drive using a spiral pattern
    3.
    发明授权
    Method of self-servo writing in a disk drive using a spiral pattern 有权
    使用螺旋图案在磁盘驱动器中自写入的方法

    公开(公告)号:US07088533B1

    公开(公告)日:2006-08-08

    申请号:US10128959

    申请日:2002-04-23

    IPC分类号: G11B5/09 G11B21/02 G11B5/596

    摘要: A disk drive includes a head and a disk, spiral patterns are located on the disk, and the disk drive self-writes servo patterns on the disk using the spiral patterns as a reference for servoing the head. In an embodiment, the disk drive uses preliminary servo patterns to determine repeatable runout of the spiral patterns. In another embodiment, the disk drive reads each spiral pattern with multiple timing windows.

    摘要翻译: 磁盘驱动器包括磁头和磁盘,螺旋图案位于磁盘上,磁盘驱动器使用螺旋图案自动写入磁盘上的伺服模式作为伺服磁头的参考。 在一个实施例中,磁盘驱动器使用初步伺服模式来确定螺旋图案的可重复跳动。 在另一个实施例中,磁盘驱动器以多个定时窗口读取每个螺旋图案。