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    • 1. 发明授权
    • Data security arrangement for an automated magnetic tape cartridge
library system
    • 一种自动化磁带库系统的数据安全安排
    • US4945429A
    • 1990-07-31
    • US148599
    • 1988-01-27
    • Frederick G. MunroKelly J. BeaversRonald W. KorngiebelRaymond L. LucchesiMichael E. Moy
    • Frederick G. MunroKelly J. BeaversRonald W. KorngiebelRaymond L. LucchesiMichael E. Moy
    • G11B15/68G11B17/22G11B27/00
    • G11B17/225G11B15/6835G11B27/002G11B2220/41G11B2220/90
    • This data security arrangement provides a significant level of data security in an automatic magnetic tape cartridge library by isolating the actual data from the control of the data retrieval process. This isolation is accomplished by the use of a plurality of architectural devices that dissociate control and data. The data written on the magnetic tape cartridges cannot be accessed by the library modules. The library modules are not electrically connected to the tape drives or the data bus that connects the tape drives to the host computer. In addition, library software on the host computer emulates an operator's console and intercepts all tape mount commands generated by the host computer. The library software translates these commands into control signals to activate the library module to retrieve a designated magnetic tape cartridge and load this cartridge into a tape drive. Thus, the data retrieval apparatus is separate from the library control apparatus. The library module is unaware of the identity of the data stored on the magnetic tape cartridges and the host computer is unaware of the existence of the automated magnetic tape cartridge library.
    • 该数据安全装置通过将实际数据与数据检索过程的控制隔离,从而在自动磁带库中提供了显着水平的数据安全性。 这种隔离是通过使用分离控制和数据的多个架构设备实现的。 磁带库中写入的数据不能被库模块访问。 库模块不与磁带驱动器或将磁带驱动器连接到主机的数据总线电连接。 此外,主机上的库软件模拟操作员的控制台,并拦截主机生成的所有磁带安装命令。 库软件将这些命令转换为控制信号,以激活库模块以检索指定的磁带盒并将该磁带加载到磁带驱动器中。 因此,数据检索装置与库控制装置分离。 库模块不知道存储在磁带盒上的数据的身份,并且主机不知道是否存在自动磁带盒库。
    • 5. 发明授权
    • Cyclical servo zone tracking method and apparatus for helical scan
recording devices
    • 用于螺旋扫描记录装置的循环伺服区跟踪方法和装置
    • US4843495A
    • 1989-06-27
    • US57296
    • 1987-05-11
    • Steven P. GeorgisKelly J. BeaversSteve E. Haugland
    • Steven P. GeorgisKelly J. BeaversSteve E. Haugland
    • G11B15/467
    • G11B15/4675
    • A tracking system and method are disclosed for a helical-scan recording device to automatically maintain the recording/playback heads in alignment with the stripes of recorded information on the magnetic tape. Each stripe on the magnetic tape includes a servo area having four distinct zones. An analog servo signal at a preselected frequency is recorded on one of the four zones on each stripe and is recorded at different ones of the four zones in succession on each group of four adjacent stripes. The servo signal recorded on the stripes is detected during playback and processed to maintain the desired head positioning relative to the stripes on the tape. The servo head is preferably maintained between adjacent stripes on the magnetic tape and signals detected from each of the adjacent stripes maintain head alignment by shifting the positioning of the head in either direction as needed.
    • 公开了一种用于螺旋扫描记录装置的跟踪系统和方法,以自动维持记录/重放头与磁带上记录信息的条带对准。 磁带上的每个条带包括具有四个不同区域的伺服区域。 在预选频率处的模拟伺服信号被记录在每个条带上的四个区域中的一个区域上,并且在四个相邻条带的每组上被连续地记录在四个区域中的不同的区域上。 记录在条纹上的伺服信号在回放期间被检测并被处理以保持相对于带上条纹的期望的头部定位。 伺服头优选地保持在磁带上的相邻条纹之间,并且从每个相邻条纹检测到的信号通过根据需要在任一方向上移位头部的位置来保持头部对准。