Problem with fairly new CompactFlas Card

I recently purchased n Ultra  CompactFlash Card up 30 MB/s* 200x for my Canon Camera.  Have been using it, and just recently when I was viewing/copying images via a card reader plugged into a usb port on my computer, it would suddenly “blank” out, show just the drive letter and say "no images available.  I would close the drive and replug it back in, and the images would be there.  This happened several times this evening.

How do I tell if it is a problem with the card, reader, or my computer?  The pictures are taking just fine, and I’ve not experienced any other problems with my computer so far.  How do I resolve this?

Thanks,

Carol

You need to isolate the issue. To rule out computer for example, you need to try another computer and same goes to the others.