Magnetic recording tape and corresponding method providing indication of end-of-tape conditions

• US 4,492,993 A
• Filed: 12/14/1982
• Issued: 01/08/1985
• Est. Priority Date: 12/14/1982
• Status: Expired due to Fees

• Current Assignee: Rosstream Research Associates Limited A Limited Partnership
• Original Assignee: Rosstream Research Associates Limited
• Inventors: Otis, Douglas A.
• Primary Examiner(s): Stellar, George G.
• Application Number:
  US06/449,599
• Time in Patent Office: 756 Days
• Field of Search: 360/74.5, 360/74.6, 360/74.7, 360/134, 369/52, 369/93, 369/94, 369/95, 369/96, 242/188, 242/195
• US Class Current: 360/74.5
• CPC Class Codes: G11B 15/06 by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape
• CPC Class Codes: G11B 23/34 Signal means additional to the main recording track, e.g. photoelectric sensing of sprocket holes for timing

Abstract

A multi-track magnetic recording tape and a corresponding method for providing an early warning of end-of-tape conditions and an indication of load-point conditions, without the use of inter-track markers. The recording tracks are divided into two sets located on separate halves of the tape, and the sets of tracks are longitudinally offset with respect to each other, to provide a half-width unrecordable region at each end of the tape. A tape marker is located in each of the unrecordable regions, each marker serving as a load-point marker for use with one set of tracks, and as an early-warning marker for use with the other set of tracks.

Claims

1. A method of detecting a warning marker indicative of an approaching end-of-tape condition for one direction of tape motion, and indicative of a load point in the other direction of tape motion, said method comprising the steps of:

positioning a first set of the recording tracks on a first half of the tape, for reading and writing in a first tape direction;

positioning a second set, constituting the remainder of the recording tracks, on the second half of the tape, for reading and writing in the opposite tape direction, the second set of tracks being offset longitudinally with respect to the first set, leaving a first unrecordable half-width region prior to the beginning of the first set of tracks and a second unrecordable half-width region prior to the beginning of the second set of tracks;

providing a first tape marker located in the first unrecordable region in such a position as to be encountered when the beginning of one of the first set of tracks is positioned in engagement with a read/write head, and also serving as a warning marker when one of the second set of tracks is being used; and

providing a second tape marker located in the second unrecordable region in such a position as to be encountered when the beginning of one of the second set of tracks is positioned in engagement with the read/write head, and also serving as a warning marker when one of the first set of tracks is being used.

2. A method as set forth in claim 1, and further including the step of:

providing end-of-tape markers close to the physical ends of the tape.

3. A multi-track magnetic recording tape capable of providing an early warning of an approaching end-of-tape condition without the use of inter-track markers, said tape comprising:

a first set of the recordable tracks located on a first half of said tape, for reading and writing in a first tape direction;

a second set of recordable tracks located on the second half of the tape, for reading and writing in the opposite tape direction, said second set of tracks being offset longitudinally with respect to said first set, leaving a first unrecordable half-width region prior to the beginning of said first set of tracks and a second unrecordable half-width region prior to the beginning of said second set of tracks;

a first tape marker located in said first unrecordable region in such a position as to be encountered when the beginning of one of said first set of tracks is positioned in engagement with a read/write head, and also serving as a warning marker when one of said second set of tracks is being used; and

a second tape marker located in said second unrecordable region in such a position as to be encountered when the beginning of one of said second set of tracks is positioned in engagement with the read/write head, and also serving as a warning marker when one of said first set of tracks is being used.

4. A tape as set forth in claim 3, wherein there are at least twelve recordable tracks in each of said first and second sets of tracks.

5. A tape as set forth in claim 3, wherein said first and second tape markers are in the form of holes through said tape.

6. A tape as set forth in claim 3, and further including:

a beginning-of-tape marker located near the physical beginning of said tape and following the end of the second set of tracks; and

an end-of-tape marker located near the physical end of said tape and following the end of the first set of tracks.

7. A tape as set forth in claim 6, wherein there are at least twelve recordable tracks in said first and second sets of tracks.

8. A tape as set forth in claim 6, wherein said first and second tape markers are in the form of holes through said tape.