| 摘要 |
A method of data access by simulating an external device to be a hard disk drive, the method enables an external device to proceed with data exchange directly with a computer. The data access method includes the following steps: firstly, the first operation system of a host detects an external device, and requests for a USB device describer from the external device. Next, the connection relationship between the host and the external device is set up in accordance with the USB device describer. An operation command is sent from the first operation system of the host to the external device, and the second operation system in the external device proceeds with data operation according to the operation command, and sends a completion message back to the host.
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