An information processing apparatus includes a memory, and a processor coupled to the memory and the processor configured to obtain requests for reading objects that exist in a plurality of wraps in different running directions on a tape of a tape storage, calculate an integrated speed for each of a plurality of orders of reading the objects based on a distance between the objects and a running speed of the tape between the objects, and select, from among the plurality of orders, an order that maximizes the integrated speed.

A method for indexing a tape for unmounting from a tape drive is discussed. The method can determine that an update has been made to the tape since it was last mounted. The method can identify a tape head position with respect to the tape, the tape including a data partition and an index partition. The method can identify first position and a second position on the tape. The method can determine first distance, a length of tape between first position and tape head position. The method can determine second distance, a length of tape between first position and second position. The method can determine that first distance is less than second distance. The method can reposition the tape to a primary section and write the metadata index. The method can reposition tape to the second position write a data index beginning at the second position of the data partition.

A method for indexing a tape for unmounting from a tape drive is discussed. The method can determine that an update has been made to the tape since it was last mounted. The method can identify a tape head position with respect to the tape, the tape including a data partition and an index partition. The method can identify first position and a second position on the tape. The method can determine first distance, a length of tape between first position and tape head position. The method can determine second distance, a length of tape between first position and second position. The method can determine that first distance is less than second distance. The method can reposition the tape to a primary section and write the metadata index. The method can reposition tape to the second position write a data index beginning at the second position of the data partition.

The magnetic tape cartridge includes a magnetic tape, and a cartridge reel, in which, in the magnetic tape, a minimum winding deviation occurrence load measured after the magnetic tape is rewound around the cartridge reel by applying a tension of 0.20 N in a longitudinal direction of the magnetic tape is 200 N or less.

A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, a magnetic layer disposed on the base layer, and a back layer disposed on a side of the substrate opposite to the base layer. A surface of the back layer opposite to the substrate has a kurtosis of 2.0 or more. On a surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 10 or more and 200 or less per 1600 μm.sup.2. A surface of the magnetic layer has arithmetic average roughness Ra of 2.5 nm or less. The entire magnetic recording medium has a BET specific surface area of 3.5 m.sup.2/g or more in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.

In an approach to improving write performance by enabling host data transfer immediately after a reposition command, responsive to receiving on a tape drive a reposition command from a host, a ready response is returned to the host. Write data from the host is accumulated in a write buffer, where the write data is accumulated in the write buffer while simultaneously moving a tape media in the tape drive to a target location. The write data from the write buffer is written to the tape media immediately after the target location is reached on the tape drive.

In an approach to improving write performance by enabling host data transfer immediately after a reposition command, responsive to receiving on a tape drive a reposition command from a host, a ready response is returned to the host. Write data from the host is accumulated in a write buffer, where the write data is accumulated in the write buffer while simultaneously moving a tape media in the tape drive to a target location. The write data from the write buffer is written to the tape media immediately after the target location is reached on the tape drive.

An information processing apparatus includes a memory, and a processor coupled to the memory and the processor configured to obtain requests for reading objects that exist in a plurality of wraps in different running directions on a tape of a tape storage, calculate an integrated speed for each of a plurality of orders of reading the objects based on a distance between the objects and a running speed of the tape between the objects, and select, from among the plurality of orders, an order that maximizes the integrated speed.

An information processing apparatus includes a memory, and a processor coupled to the memory and the processor configured to obtain requests for reading objects that exist in a plurality of wraps in different running directions on a tape of a tape storage, calculate an integrated speed for each of a plurality of orders of reading the objects based on a distance between the objects and a running speed of the tape between the objects, and select, from among the plurality of orders, an order that maximizes the integrated speed.

A magnetic tape device, in which a magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, and the magnetic tape after running in a state where the tension is applied is caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and an adhesive strength of the magnetic layer of the magnetic tape is 1.0 N or more, and an adhesive strength of the back coating layer is 1.0 N or more.