公开(公告)号：DE69222391D1

公开(公告)日：1997-10-30

申请号：DE69222391

申请日：1992-10-28

Applicant: IBM

Inventor： BASHAM ROBERT BEVERLEY ,  KISER JONATHAN MASON ,  PARAPOURIAN ARA SARKIS

IPC: G06F3/06 ,  G11B15/087 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/32

Abstract: A tape drive subsystem uses variable length symbols to identify reliably data stored on the tape, in particular, serial numbers of tape cartridges having different track densities. A variable length symbol code is encoded on the tape in a plurality of groups G1 to G48 with each group having a first logical state or "1" being represented as an erase gap signal (ERG) covering the first two units of a group, or a second logical state or "0" represented as an ERG signal covering the first unit of the group, both followed by an inter-block gap signal (IBG) covering four units of the group.

公开(公告)号：DE69222391T2

公开(公告)日：1998-03-26

申请号：DE69222391

申请日：1992-10-28

Applicant: IBM

Inventor： BASHAM ROBERT BEVERLEY ,  KISER JONATHAN MASON ,  PARAPOURIAN ARA SARKIS

IPC: G06F3/06 ,  G11B15/087 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/32

Abstract: A tape drive subsystem uses variable length symbols to identify reliably data stored on the tape, in particular, serial numbers of tape cartridges having different track densities. A variable length symbol code is encoded on the tape in a plurality of groups G1 to G48 with each group having a first logical state or "1" being represented as an erase gap signal (ERG) covering the first two units of a group, or a second logical state or "0" represented as an ERG signal covering the first unit of the group, both followed by an inter-block gap signal (IBG) covering four units of the group.