IOCTL_TAPE_SET_ENCRYPTION_STATE

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This IOCTL command allows only set encryption state for application-managed encryption.
Note: On unload, some drive settings might be reset to default. To set the encryption state, the application must issue this IOCTL after a tape is loaded and at BOP.
The data structure that is used for this IOCTL is the same as for IOCTL_GET_ENCRYPTION_STATE.
#define IOCTL_TAPE_SET_ENCRYPTION_STATE CTL_CODE(IOCTL_TAPE_BASE, 0x0821, 
				METHOD_BUFFERED, 
				FILE_READ_ACCESS | FILE_WRITE_ACCESS )
An example of the IOCTL_TAPE_SET_ENCRYPTION_STATE command is
ENCRYPTION_STATUS scEncryptStat;
DeviceIoControl(hDevice,
                IOCTL_TAPE_SET_ENCRYPTION_STATE,
                &scEncryptStat,
                sizeof(ENCRYPTION_STATUS),
                ,&scEncryptStat
                sizeof(ENCRYPTION_STATUS),
                &cb,
                (LPOVERLAPPED) NULL);