Tape storage device

A method comprising:

• writing data stored in a buffer onto a tape;
• writing an interval marker on the tape after the data stored in the buffer is written onto the tape;
• writing next data subsequent to the interval marker when the next data is stored in the buffer in a first round corresponding to a first-time write in a single track in the tape;
• writing data stored in the buffer in an area of the interval marker in a second round corresponding to a second-time write in the single track;
• and
• writing data stored in the buffer in an area of the interval marker in which no data is written in each of third and subsequent rounds corresponding to third- and subsequent-time writes in the single track.

A computer program product for writing data onto a tape, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code readable/executable by a controller to:

• write, by the controller, data stored in a buffer onto a tape;
• write, by the controller, an interval marker on the tape after the data stored in the buffer is written onto the tape;
• write, by the controller, next data subsequent to the interval marker when the next data is stored in the buffer in a first round corresponding to a first-time write in a single track in the tape;
• write, by the controller, data stored in the buffer in an area of the interval marker in a second round corresponding to a second-time write in the single track;
• and
• write, by the controller, data stored in the buffer in an area of the interval marker in which no data is written in each of third and subsequent rounds corresponding to third- and subsequent-time writes in the single track.