Writing and reading data having multiple access patterns on tape media

摘要

Data is recorded such that the positions of data will be aligned in a traveling direction and a width direction of the storage medium. The medium travels in the traveling direction from a first to a second position as a certain wrap of a group of plural files in a first physical range between the first and the second positions. A head shifts from the certain wrap to another wrap in the width direction of the medium. The medium travels in the traveling direction from a third to a fourth position as the other wrap of a group of plural files in a second physical range between the third and the fourth positions. The plural files in groups on the certain wrap and the other wrap may be written in reverse order to each other after being once stored in a buffer.

主权项

1. A method of aligning, in a traveling direction of a storage medium, physical ranges of groups of plural files stored across a plurality of wraps divided in a width direction of the storage medium, comprising:
traveling the storage medium from a first position to a second position of the storage medium as a certain wrap in the traveling direction to write a group of plural files or read the group of plural files in a first physical range between the first position and the second position, wherein the travelling direction of the storage medium is a longitudinal direction of the storage medium, and wherein the width direction of the storage medium is a lateral direction of the storage medium; shifting a head from the certain wrap to another wrap in the width direction of the storage medium; and traveling the storage medium from a third position to a fourth position of the storage medium as the other wrap in the traveling direction to write a group of plural files or read the group of plural files in a second physical range between the third position and the fourth position, wherein the first physical range and the second physical range, and further relative positions of plural files in these ranges are substantially aligned in the traveling direction of the storage medium, wherein an attribute of each of plural files stored in the first physical range is substantially identical to an attribute of each of plural files stored in the second physical range, and the group of plural files on the certain wrap and the group of plural files on the other wrap are provided in a manner to be distinguishable from each other.