Filesystem module throws exception after a certain number of files

TinyCLR OS
1

I am using an SC20260E in a data collection system and I have run into an issue where I cannot write more than 400 files to an SD card. I am using a 32GB card, formatted FAT 32. When I try to write another file after 400, I see the following exception:

    #### Exception System.InvalidOperationException - CLR_E_INVALID_OPERATION (1) ####
    #### Message: 
    #### GHIElectronics.TinyCLR.IO.FileSystem+NativeFileStream::Write [IP: 0000] ####
    #### System.IO.FileStream::Write [IP: 0041] ####

Does anybody else experience the same?

2

How about each folder 100 files?

3

Anyway, just quick test, write 500 files looks till good to us:

Simple code below:

static void DoTestWrite500()
        {
            var systemTimeStart = DateTime.Now;

            var media = StorageController.FromName(FSSD_API_CONTROLLER);


            var drive = GHIElectronics.TinyCLR.IO.FileSystem.Mount(media.Hdc);

            DriveInfo driveInfo = new DriveInfo(drive.Name);


            Debug.WriteLine("Free:  " + driveInfo.TotalFreeSpace);
            Debug.WriteLine("TotalSize: " + driveInfo.TotalSize);
            Debug.WriteLine("VolumeLabel:" + driveInfo.VolumeLabel);
            Debug.WriteLine("RootDirectory: " + driveInfo.RootDirectory);
            Debug.WriteLine("DriveFormat: " + driveInfo.DriveFormat);         

            for (int i = 0; i < 500; i++)
            {
                var filename = drive.Name + "\\test" + i.ToString() + ".txt";
                using (var writeStrem = File.Open(filename, FileMode.Create))
                {
                    var data = System.Text.Encoding.UTF8.GetBytes("Thi is for test\n");
                    writeStrem.Write(data, 0, data.Length);

                    writeStrem.Flush();
                }


                Thread.Sleep(10);
                Debug.WriteLine("done write " + filename);
            }
            GHIElectronics.TinyCLR.IO.FileSystem.Flush(media.Hdc);



   

        }

image
image1156×744 52.4 KB

4

Your code ran fine on my system as well, definitely odd as I am able to recreate my issue as well. I found a limit of 128 files per folder, I am limiting my directory size to 120 because of that.

You mentioned 100 files per folder, is that something I should consider a limit instead?

5

i am seeing the speed of writting slow down when write from files 3xx if they are same folder.