A computer-implemented method, according to one embodiment, includes: receiving a first portion of data to be written in a magnetic medium, dividing the first portion of data into a plurality of blocks, appending an identification segment having identification information therein to each of the blocks, wherein each block and the corresponding identification information appended thereto forms a record, writing each record in a data partition of the magnetic medium, and writing an index in the data partition of the magnetic medium in response to a predetermined condition being met, wherein the index is associated with all data on the magnetic medium. Other systems, methods, and computer program products are described in additional embodiments.

A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.

The present disclosure generally relates to a captive tape drive comprising a tape head. The captive drive comprises an upper assembly, the upper assembly comprising a first tape, a first supply reel, a first take-up reel, and two or more rollers. The captive tape drive further comprises a lower assembly disposed below the upper assembly, the lower assembly comprising a second tape, a second supply reel, a second take-up reel, and two or more rollers. The tape head is disposed between the plurality of rollers, and is configured to move between the upper assembly and the lower assembly to access the first and second tapes. The tape head comprises one or more modules, each module comprising 64 writers and 64 readers. Each module is configured to write data to the first and second tapes using the 64 writers and to read verify the newly written data using the 64 readers.

A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.

A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.

A mechanism is provided for generating enumerated information in which a plurality of files is enumerated except entirely-invalidated files on a sequential medium. Management information for managing locations where the plurality of files on the sequential medium are recorded is acquired from the sequential medium. The enumerated information in which the plurality of files are enumerated is generated in an order according to the locations where the plurality of files are recorded on the basis of the acquired management information.

The present invention provides a method of partitioning a tape medium dynamically by using a new method of writing data. It enables users to change size of the partitions later and to use all capacity of a tape efficiently. When a tape is divided into partitions, data is written in such a manner that the wraps are written in the partitions of the data band alternately in the forward direction and in the backward direction on the data band from the different sides of the data band toward the inside of the data band (W1, W2, W3 . . . ) and the location (C) at which the wrap (Wm) of the one partition collides with the wrap (Wn) of the other partition is defined as the demarcation (PB) of these partitions (P0,P1).

A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.