The Sony HXR-FMU128 Flash Memory Unit is an optional recording device compatible with Sony's HXR-NX5U and NEX-FS700 camcorders. The unit enables the ability to record to two devices simultaneously, (drive and SD card) realizing an instant backup in the desired format. The device is capable of recording exceptionally long run-times. In FW mode (24Mbps), the HXR-FMU128 can record an incredible 11 hours of footage without offloading.
Sony HXR-FMU128 Flash Memory Unit