Hi, I had similar problem with my NH1 with standard MDs formatted to HiMD, the recording was corrupted and it said "AuFileErr". I can't remeber exactly now, but i think it only happened with HiSP mode. But one day on a concert I was made some recordings on HiMD disc in PCM, and after pressing STOP , the disc didn't stop, until i removed power. The disc was totally empty, i examined its contents byte for byte and all were zero. At the service, they told me it is faulty board and gave me new unit. It's about a half a year, the device seems to be well. M>