FWIW, I have never deleted a folder or a file on this deck (or any other for that matter) I just reformat after I have moved the files to my PC, and feel certain my transfer has no hiccups. With the file and root structure being different on every deck, reformatting seems much easier and safer. Some decks have very long slow reformats, so in that case I do the quick reformat. On my R-05 I use a cheapo 16gb polaroid SD card and have reformatted it over 100 times. I've never had a single problem.
I also use the R-05 as music player so the music folders just got corrupted after I deleted the folders containing the recordings, it seems a bug to me.
Similar experience here. I've never deleted stuff using the deck, and never had a problem like this.
Then how do you delete it or you never delete it all?
I have deleted files off the SD card using the option on the R-05 and haven't run into this issue.
At the risk of stating the obvious, have you been formatting the SD card with the R-05? If you have not and have been formatting the card with your computer and then just inserting it and using it in the deck, you're opening the door for all sorts of potential issues with it. You MUST insert the card into the R-05 and then format it with that option on the recorder. That's standard practice for all decks with removable digital media and the best way to minimize issues like the one you're describing. Good luck.
Yes that was the first thing I did from the deck even before reading the manual so that I lost its bundled content!
Change your user name as the r-05 does not like blasphemy
I like the R-05, it's a nice tool and very easy to use not to mention I'm satisfied with the quality of its microphones also I'm still running on its stock alkaline batteries I dunno how many hours I recorded!
You can carry this unit and make semi-pro jobs without having to bring external mics, preamps etc .etc...
BTW, I can't change my user name, it took me too much effort and time to make one!