公开(公告)号：DE3278888D1

公开(公告)日：1988-09-15

申请号：DE3278888

申请日：1982-01-19

Applicant: IBM

Inventor： HEMPY HARRY O ,  KIRKPATRICK CHARLES RONALD ,  ROBINSON FRANCIS LEROY

IPC: G06F3/06 ,  G06F12/08 ,  G11B20/10

Abstract: In a buffered data recording peripheral system, data is promoted to the buffer (15) in anticipation of a connected host (12) using the promoted data in the near future. In a tape recorder data storage apparatus the actual position of the tape (20) reflects the last promoted data; such actual tape position is "inconsistent" with host operations. If the sequence of host operations continues, such inconsistency actually enhances total operations. When the system detects a change or possible change in future host operations (rewind command, change in tape motion direction, etc.), detect end of file (tape mark) or a change in system operations (load balance affecting drive or deallocation of buffer from drive) the data promoted to the buffer and not read by the host is erased from the buffer. The tape is moved such that upon a forward motion the tape drive would next read data on tape corresponding to the data block erased from the buffer.

公开(公告)号：DE3277991D1

公开(公告)日：1988-02-18

申请号：DE3277991

申请日：1982-02-05

Applicant: IBM

Inventor： BAUER WAYNE JOHN ,  DODT WILLIAM CARL ,  KIRKPATRICK CHARLES RONALD ,  REHAGE TED ANTHONY ,  ROBINSON FRANCIS LEROY ,  TAYLOR WILLIAM KING

IPC: G06F3/06 ,  G06F11/20 ,  G06F13/12 ,  G06F13/38 ,  G06F13/42