Creating a folder on SD card

Question

I have a metro style application that needs to do automatic backup to an SD Card.

In manifest capabilities I checked the "Removable Storage" option but when I try to create a folder on the SD Card using "

CreateFolderAsync" I get the following exception:

"Error HRESULT E_FAIL has been returned from a call to a COM component."

using exactly the same command but in the Documents folder works good.

                StorageFolder Devices = Windows.Storage.KnownFolders.RemovableDevices;
                StorageFolder BackupDevice = await Devices.GetFolderAsync(BackupDrive); //BackupDrive is the SD Card folder
                if (BackupDevice != null)
                {
                    StorageFolder tst = Windows.Storage.KnownFolders.DocumentsLibrary;
                    BackupFolder = await tst.CreateFolderAsync(mBackupFileNamePreffix, CreationCollisionOption.OpenIfExists); //For test works OK
                    BackupFolder = await BackupDevice.CreateFolderAsync(mBackupFileNamePreffix, CreationCollisionOption.OpenIfExists); //Generate an exception
                    if (BackupFolder != null)
                        status = BIONESSDBBackupFoldeStatus.OK;
                }

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Software engineer

Answer 1

Today it started to work without any change to the code.

The only thing is windows did an update an reboot automatically.

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Software engineer

Answer 2

If it happens again, please capture a procmon log to begin with so we can determine if the device was accessed.

Thanks!

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David Lamb