I have a new R-09HR running the 1.06 operating system, using a new Sandisc 8GB SDHC card. Two of the last three times I have used this card I have had files disappear. Both times the file appeared fine after recording, but after turning off the unit and restarting, the file was gone. Both times it was the second file on the card and the first file was still there. The first time this happened I recorded a test file and deleted the test file. After rebooting, the deleted file reappeared (multiple times). When USB connected to my XP PC, there was a file named ._dmy_r09_ on the card with properties WAV - 76 bit sample rate 10.1 khz on the root. I used the XP> properties>tools> error checking to repair the card. The first time the mystery file disappeared,but the audio file was not recovered. The second time the mystery file disappered and the audio file was recovered. Has anyone else seen this problem? Is this a defective card?