Fast data exchange system between different type computer and medium storing program of extent information and transformation

DETAILED DESCRIPTION An object of the present invention is to resolve the above mentioned problem.
Another object of the present invention is to quickly exchange or share a file between plural computers of different types of OSs, even if data layout on the external storing device for the file is unknown.
The present invention comprises, for sharing, transmitting or exchanging files managed by operating system between plural computers having different types of operating systems, means for extracting file locations on an external storing device independently of the file systems which are programs in the operating system managing the files, and means for sharing, transmitting and exchanging with another computer by implementing accessing to the external storing device based on the file location information by a device driver which implements an input and output to an external storing device.
A fast data exchange of the present inventions (sharing, transmitting and exchanging) between different kinds of computer is realized by means for extracting the location of the user file data stored by OS on an external storing device such as a disk drive without changing an existing file system of OS except a minimum change of the OS, device drive.
The device drive which implements inputting to and outputting from the storing device includes means executing the file access by changing the extent information, which represents a location of the file directed by a file system on the external storing device to another extent information directed in advance.
The above-mentioned means are implemented by a disk drive for an external storing device, for which the storing system on external storing device managed by another operating system is different, by changing an extent information sent from a file system to another extent information by using an exchanging table which is prepared in advance.
Further the present invention comprises means for transmitting the extent information directing the location of a file in the external storing device from a first computer to a second computer, when transferring the file from the first computer to the second computer of which the OSs are different from each other, means for copying data in the file and realizing the file transmitting by accessing directly to the external storing device based on the extent information received by the second computer