Apparatus and method for writing data to recording medium

Patent metadata

Field	Value
Publication number	US-9122425-B2
Application number	US-42063109-A
Country	US
Kind code	B2
Filing date	Apr 8, 2009
Priority date	Apr 23, 2008
Publication date	Sep 1, 2015
Grant date	Sep 1, 2015

Abstract

A distance calculating unit calculates a distance from a current position on a tape to the end of the tape. A command processing unit receives a write command. If the distance is small, a determining unit sets a usable capacity of a buffer to be equal to a maximum capacity of the buffer. If the distance is large, the determining unit sets the usable capacity of the buffer according to the distance. If a capacity for data indicated by the write command is less than or equal to a difference between the usable capacity and current usage of the buffer, a buffer managing unit stores the data in the buffer. When the command processing unit receives a write FM command, the buffer managing unit reads the data from the buffer, updates the current usage, and a channel input/output unit writes the data to the tape.

First claim

What is claimed is:

1. An apparatus for writing data in a buffer to a recording medium according to a command from a higher-level device, the apparatus comprising:
an identifying unit configured to identify a size of an unused area of the recording medium;
a determining unit configured to determine, on the basis of the size of the unused area, an upper limit of a capacity for data that can be stored in the buffer; and
a storage unit configured to store, according to a command…

Assignees

• Oishi Yutaka
• IBM

Inventors

• Oishi Yutaka

Classifications

• G06F3/0673

  Physics · mapped topic

• G06F3/0656 Primary

  Physics · mapped topic

• G06F3/0613

  Physics · mapped topic

• G06F5/12 Primary

  Physics · mapped topic