Cloning a Virtual Disk Compute Space Needed for Clone This function computes the space required (in bytes) to clone a virtual disk, after possible format conversion. vixError = VixDiskLib_SpaceNeededForClone(child.Handle(), VIXDISKLIB_DISK_VMFS_FLAT, &spaceReq); VixDiskLib_SpaceNeededForClone() might not give accurate results, or could return VIX_E_INVALID_ARG, when used with thin provisioned disk type VIXDISKLIB_DISK_VMFS_THIN. Clone a Disk by Copying Data This function copies data from one virtual disk to another, converting (disk type, size, hardware) as specified. vixError = VixDiskLib_Clone(appGlobals.connection, appGlobals.diskPath, srcConnection, appGlobals.srcPath, &createParams, CloneProgressFunc, NULL, TRUE);