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    • 2. 发明授权
    • Detecting a servo error on a magnetic tape and identifying extent and
location of the detected servo error by linked control marks
    • 检测磁带上的伺服误差,并通过链接的控制标识识别检测到的伺服误差的程度和位置
    • US5394280A
    • 1995-02-28
    • US75622
    • 1993-06-14
    • Alex ChliwnyjDavid C. GravesScott M. FryPamela R. Nylander-HillHabib M. TorabWill A. Wright
    • Alex ChliwnyjDavid C. GravesScott M. FryPamela R. Nylander-HillHabib M. TorabWill A. Wright
    • G11B20/12G11B5/008G11B5/584G11B15/04G11B15/087G11B20/18G11B21/08G11B5/09G11B5/596
    • G11B21/088G11B15/04G11B15/087G11B5/00817G11B5/584
    • A magnetic tape drive simultaneously senses on a magnetic tape three evenly spaced-apart servo track areas for servoing a multi-track magnetic head to follow a concurrent set of data tracks on the magnetic tape. The data tracks are arranged into a plurality of track groups. Each track group has a first and second subgroup of data tracks. The first subgroup of tracks are scanned in a first relative motion of the magnetic tape and magnetic head as a forward direction (tape is being spooled from a supply tape reel). The second subgroup of tracks are scanned in a second relative motion of the magnetic tape and magnetic head that is opposite in direction to the first relative direction and is a forward direction of scanning. While writing data in any one of the plural track groups, a servo dropout affecting most of the servo track areas is detected and indicated as a servo error. Writing is aborted. The relative position of the magnetic tape and head is detected at both longitudinal ends of the servo dropout. A servo dropout block (SDB), a tape control block, is written at each longitudinal end of the servo dropout only in the group of tracks in which data are being written. The tape space between the two SDBs is termed a limited portion of the tape in which no recording is permitted.
    • 磁带驱动器同时在磁带上感测三个均匀间隔开的伺服磁道区域,用于伺服多轨磁头以跟随磁带上的一组数据轨道。 数据轨道被布置成多个轨道组。 每个轨道组具有第一和第二子数据轨道子组。 轨道的第一子组以磁带和磁头作为向前方向的第一相对运动扫描(磁带从供带卷轴卷绕)。 轨道的第二子组以与第一相对方向相反的磁带和磁头的第二相对运动扫描,并且是扫描的正向。 当在多个磁道组中的任何一个中写入数据时,检测到影响大多数伺服磁道区域的伺服压差,并将其表示为伺服误差。 写作中止。 在伺服脱落的两个纵向端处检测磁带和磁头的相对位置。 只有在正在写入数据的磁道组中,伺服压差块(SDB)(磁带控制块)被写入伺服压差的每个纵向端。 两个SDB之间的磁带空间被称为不允许记录的磁带的有限部分。