公开(公告)号：US5142422A

公开(公告)日：1992-08-25

申请号：US670404

申请日：1991-03-15

申请人： Christopher P. Zook ,  Robert Bordasch ,  Steven P. Georgis ,  Alireza Atai-Azimi ,  Christopher Pisciotta ,  Steve E. Haughland ,  Timothy C. Hughes

发明人： Christopher P. Zook ,  Robert Bordasch ,  Steven P. Georgis ,  Alireza Atai-Azimi ,  Christopher Pisciotta ,  Steve E. Haughland ,  Timothy C. Hughes

IPC分类号： G11B5/008 ,  G11B5/09 ,  G11B20/12 ,  G11B20/18

CPC分类号： G11B20/1883 ,  G11B20/1209 ,  G11B5/00865 ,  G11B5/09 ,  G11B2020/183 ,  G11B2220/90

摘要： A dual channel helical scan recording system (30) includes a rotating dum (36) having sets of heads (W1, W2) (R1, R2) mounted on its peripheral surface (56). A set of write heads (W1, W2) is situated on an opposite side of the drum (36) from a set of read heads (R1, R2). The write heads (W1, W2) simultaneously write two adjaent tracks (T1, T2), which are read for verification 180 detrees later by corresponding read heads (R1, R2). The heads (W1, W2, R1, R2) are strategically mounted on the drum (36) with respect to angular and axial placement, and have selected head widths and azimuthal angles. Should a block of data (317) written to tape (32) be determined, during readback, to be bad block, that bad block is subsequently rewritten on the tape (32) in the course of writing good blocks and amongst other good blocks. The rewritten block is recorded at a row position on the tape which is sufficiently displaced from the row position of a previous writing to avoid media defects occuring on the tape. In addition, a block written by a first write head (W1) and perceived as having been written as a bad block must be written by a second write head (W2) before that block is rewritten a predetermined number of times.

摘要翻译： 双通道螺旋扫描记录系统（30）包括具有安装在其外周表面（56）上的一组头（W1，W2）（R1，R2）的旋转转台（36）。 一组写头（W1，W2）位于鼓（36）的与一组读头（R1，R2）相反的一侧。 写入头（W1，W2）同时写入两个相邻磁道（T1，T2），后者由对应的读取头（R1，R2）进行读取。 头部（W1，W2，R1，R2）相对于角度和轴向布置策略地安装在滚筒（36）上，并且具有选择的头部宽度和方位角。 如果写入磁带（32）的数据块（317）在回读期间被确定为坏块，那么在编写好块和其它好的块之间，该坏块随后被重写在磁带（32）上。 重写的块被记录在磁带上的行位置，该行位置从先前写入的行位置充分移位，以避免磁带上出现介质缺陷。 此外，由第一写入头（W1）写入并且被感知为被写入坏块的块必须在该块被重写预定次数之前由第二写入头（W2）写入。