Abstract: Virtual disk technology is an important topic of storage virtualization.For the time being，much kernel programming is involved when a new kind of virtual disk support is developed，which is a great challenge for most application developers.A general virtual disk implementation framework is presented to resolve this problem.In this framework，a general kernel module is proposed to provide standard block device interface to the operating system.On the other hand，this kernel module also provides a general request/response passing interface to the user space virtual disk service application.Finally，based on Linux NBD driver，a prototype is constructed，which verifies this study.