I bought two of these RCA RP-5020 recorders. On one, I filled up folder A with 99 files. Then I started going through my files to delete some. I deleted several, then the thing started acting wierd. I found a duplicate of one file, and another file didn't play at all. I turned it off, and back on again, and suddenly it said 00/00 files in folder A. But the amount of free time remaining in HQ mode was still 6 hours 50 minutes. (Out of the 9 hours or so that was available before I started recording files.)
Then I had the exact same experience with the 2nd recorder. I filled up folder A with 99 files. Then I deleted file #87. That left 98 files. I played a few of them, everything seemed okay, and shut it off. When I turned it back on, it said 00/00 files in folder A! But the amount of free time remaining was still about 7 hours out of 9!
I tried resetting the device by removing the batteries for a few hours. The settings all returned to default, but the files were still missing, and the amount of available time remained about 7 out of 9 hours in HQ mode.
I called RCA technical help, and all they could tell me to do was reformat the device to reclaim the missing time. I said NO! I wanted my recordings back, some of which contained a departed family member. Then they told me to try to record more files and delete them, because they wanted to find out if the available time went up or down. I refused, because I didn't want to lose my old data. (Why couldn't they experiment on one of their own?) I also emailed them, and they said they couldn't help me in an email, and that I should call them. RCA's response to this problem has been downright shameful.
So I bought a third RCA RP-5020 to experiment for myself. I found that when there are less than 30 or so files in a folder, you can delete them without running into problems. But when you get into the 80's or 90's, and delete just one file, turn the device off and back on, it will say 00/00 files in that folder. But the used up time will stay used up. I repeated this process about 7 or 8 times, using folder B, C, D, A again, B again, C again, then A yet again, with the exact same result. The files kept vanishing, while the amount of available time kept decreasing.
I also monitored what happened to the available time when there were only 20 or so files in a folder, and I deleted some of them. I didn't experience the same data loss as above, and the available time went back up the equivalent of whatever size the deleted files were, as it should.
The lost data is obviously still in the flash memory, but not being detected. Possibly corrupted, but I am leaning toward the suspicion the device just can't index it anymore.
Has anyone tried a data recovery specialist? If so, I would like to hear which company you used, if they were successful, and the cost.