公开(公告)号：US20110051277A1

公开(公告)日：2011-03-03

申请号：US12870336

申请日：2010-08-27

申请人： Richard L. Bradshaw

发明人： Richard L. Bradshaw

IPC分类号： G11B5/02

CPC分类号： G11B5/0245 ,  G11B5/024

摘要： A method is provided for securely erasing residual data on a magnetic tape formatted with a plurality of servo patterns providing boundaries between a plurality of data bands containing data that is recorded thereon during normal write operations, the data being written on many adjacent data tracks that run parallel to an edge of the magnetic tape. The method includes identifying a first edge of each of the plurality of servo patterns and erasing a portion (for example, a first half) of each of the plurality of data bands during a first pass of a tape head as it moves in a first direction. The method further includes the step of indexing the tape head to identify an opposite second edge of each of the plurality of servo patterns and erasing a different portion (for example, an opposite second half) of each of the plurality of data bands during a second pass of the tape head as the tape head moves in a second direction opposite the first direction.

摘要翻译： 提供了一种方法，用于在用多个伺服模式格式化的磁带上安全地擦除残留数据，所述多个伺服模式在正常写入操作期间在其上记录有数据的多个数据带之间提供边界，数据被写入许多运行的相邻数据轨道上 平行于磁带的边缘。 该方法包括识别多个伺服图案中的每一个的第一边缘，并且在磁带头的第一次通过期间，当第一边沿第一方向移动时，擦除多个数据频带中的每一个的一部分（例如，前半部分） 。 该方法还包括对磁带头进行索引以识别多个伺服模式中的每一个的相对的第二边缘并且在第二次擦除期间擦除多个数据频带中的每一个的不同部分（例如，相反的后半部分）的步骤 当磁带头沿与第一方向相反的第二方向移动时磁带头的通过。

公开(公告)号：US5080825A

公开(公告)日：1992-01-14

申请号：US428544

申请日：1989-10-30

申请人： Richard L. Bradshaw

发明人： Richard L. Bradshaw

IPC分类号： C11D1/72 ,  C11D1/74 ,  C11D3/10 ,  G11B23/50

CPC分类号： C11D3/10 ,  C11D1/72 ,  C11D1/74

摘要： A water based cleaning composition suitable for use in tape drives including very small quantities of a surfactant, preferably a tridecyl alcohol ether of polyoxyethylene, and an ionic salt of ammonia is disclosed. The quantity of surfactant is such that it is totally water soluble and furthermore does not exist as a free solvent susceptible to evaporation into the environment. The combination of the surfactant and an ionic salt of ammonia, preferably ammonium carbonate, enhances detergency and the suspension of debris without leaving a residue. In addition, the ionic salt of ammonia is provided in a quantity which maintains a neutral pH, thereby minimizing the corrosiveness of the cleaning composition and eliminating static.

公开(公告)号：US4568611A

公开(公告)日：1986-02-04

申请号：US719402

申请日：1985-04-03

申请人： Charles J. Amirsakis ,  Richard L. Bradshaw

发明人： Charles J. Amirsakis ,  Richard L. Bradshaw

IPC分类号： C08K3/22 ,  C08G18/00 ,  C08G18/42 ,  C08G18/66 ,  C08L75/00 ,  C08L75/06 ,  C09D5/23 ,  C09D167/00 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/73 ,  G11B5/70 ,  B32B27/40

CPC分类号： C08G18/664 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31609

摘要： A composition containing CrO.sub.2 and a polyester-polyurethane wherein the chain extender contains a mixture of 1,4-butanediol and 1,6-hexanediol; and use thereof, especially in magnetic recording media.

摘要翻译： 含有CrO 2和聚酯 - 聚氨酯的组合物，其中扩链剂含有1,4-丁二醇和1,6-己二醇的混合物; 特别是在磁记录介质中。