Detection of the external USB drive mounting

We have a system running (currently) on the cRIO-9014 controllers. They run headless and unsupervised for long periods of time and periodic journal (~ 1-2 hours between Scriptures) data set in the local SSD on the controller. Occasionally, a person in the field will connect a USB thumbdrive to the controller. Without other intervention on the part of the technician on the field, I want to empty the data files since the last visit on the disk.

Ideally, I was hoping to find that plug in a USB key would argue an IRQ or some system events? The only other way I can think of is to periodically read the root on any drive is mapped to the USB and if it mistakes, I know there is no USB stick attached, but this sounds... gross. Is there a better way to do it?

Thank you

Q

Sorry for the resurrection of thread but I wanted to document a potential pit fall to warn everyone else having to enumerate/detect a USB on a real-time target:

The solution posted by Patricia B has the disadvantage of also return 0 if the memory stick has been recently formatted (for example, it is empty) since the return of the 'size' will return the number of files/folders and not the size of the stick if the input path is a directory. Now, if instead of that, you use the error state as your cheque you would be all good.

Where I was wrong was when I thought to myself, well, why not use the 'get Volume Info.vi' instead (also in the advanced file palette. This way I get the size of the volume, so potentially I could check if I have enough free space before I start my routine of dump file. It worked swell, but there is a documented problem (internally at OR) (bug) with the "get Volume Info.vi:

IF the error in this VI INPUT Terminal is connected AND that the function returns an error (which it will do if a USB key is not present), then it will be a memory leak. If you use it in a method of voting (e.g. once per second) on a cRIO, you miss of contiguous memory within a few days (depending on your poll rate and how much activity allocation and the deallocation of memory you past.) This allows for a pesky hard to find the problem of stability in the long term you can't miss easily unless you do really detailed memory monitors during the days of execution before you deploy your code...

The solution is to NOT connect the error to this VI input terminal and the leak memory goes.

Hope this helps others avoid trouble!

Tags: NI Hardware

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