In the view of data storage security for the existing cloud disk, this paper presents a terminal transparent encryption storage mechanism which is irrelevant to existing cloud storage security mechanism. This mechanism can solve the problem of the user's trusting in the cloud disk storage fundamentally. By the method of formatting into N size fixed files, this mechanism of cloud disk can be seen as a RAW storage device, which stores data into the physical sector. In Multi-cloud disks mode, a dynamic selection strategy based on partitioning factor is proposed to promote the efficiency of file storage by uneven parallel cloudy disk access. To prove the feasibility of data recovery, an interrupt retransmission mechanism and an encoding redundancy backup mechanism are put forward, respectively. By utilization of transferring the control of data security from the cloud storage to the client side, the effective terminal transparent encryption storage mechanism for multi-cloud disks is guaranteed, which not only solves the problem of the user's trusting in the cloud disk storage fundamentally and concerns of the cloud storage operator reliability but also enhances the security and reliability of the file storage and improves the file access rate as well as storage rate of document transparent encryption.
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