Hi jbone1313,
the “Modded 707” sample collection I mentioned in the first post has 804 wav files (I just took a look at the the 48k converted directory, hadn’t deleted that one, yet).
All files were uploaded into one directory (in one go / overnight) and I sorted the files into directories (on the AR) the next day.
I just counted them by going through all AR directories and using “select all” to show the file count.
The total count is 510 (!)
So you’re right!
Apparently there is a limitation of 512 (510?) files per directory.
Thanks a lot for noticing this !
In my case this did not cause any severe issues (e.g. file system corruption).
May I ask which firmware version your AR is running ?
I’m on 1.22b but it could very well be that I still had 1.21c installed when I did the upload – it’s already been 1.5 months since then.
By the way: If an upload did not finish b/c of this 510 files-per-directory limitation and you still have not deleted the “48k/” directory (and the filelist.txt):
Copy the “filelist.txt” to “leftovers.txt”, then edit it and remove all entries until line 511, then upload the remaining files using this cmdline:
$ cd my_sample_dir/48k
$ tks app:sds leftovers.txt -indev "$SDS_INDEV" -outdev "$SDS_OUTDEV"
Oh my, now I have to do this for all the sample packs I’ve uploaded since then… most of them have more than 510 files 
Cheers!