I had the same problems. it would fail in copying a file, then the card would be corrupted. Stopped using it.

 

I used the R4 reader for a few days, and then it started to freeze my PC whenever I plugged it in. It's not a very reliable accessory.

 

There was apparently a bad batch of the readers. They assumed they all worked, which majority of them do. I've used mine since I got it and it's been perfect. The few bad ones that turned up became enough of a problem that they replaced it with a totally different one. Nonetheless, I was lucky enough to get one of them that has no problems at all.

EDIT: ...this is like, the third time you've beat me to a response, iamwhoiam...making my post redundant..stop fucking ninjaing all over my shit

 

What do you mean? .....

 

had the same problem with the blue reader I got with my r4. first it was freezing my pc then I had issues with corrupted files and directories and then finally it just melted lol literally melted. nuts. just dont use em. not worth it. buy a cheap one from newegg.com or something.

 

I reformatted the flash card and it worked fine. But I am not going to use the USB reader again. Risk just isn't worth it; if it's corrupting files, who knows what else could go wrong?

 

Killed my card ($27)

 

There's already been like 5 different readers they've sent out from what I've seen/read. Apparently this one (link) seen in the review doesn't work according to shaunj66 (link). This is the one I received (link) and it's worked perfectly since I've got it. Then there's the black/grey one just mentioned (sorry, can't find a pic of). I also think there's at least one more I've read that someone got. Not sure what to tell ya since the different ones included obviously aren't consistent enough :/

 

I have one of the blue ones. It's still working fine after several dozen uses, but with a lot of people having problems with it, I'm getting worried if it will fry my microsd one day... I've switched temporarily to an ultra slow 1MB/s reader.