[atlas] Failing 4GB USB on v3 probes?

So far, I have had two of the SanDisk Cruzer 4GB drives (SDCZ33) fail, and I think I have two other ML-3020 (v3) devices with the same fate. Case #1, the drive fell into read only one. Case #2, the drive identifies to the USB, but read of block 0 (capacity) fails. The first time I called SanDisk and jumped through their hundred hoops to replace it.They were reluctant since I couldn't produce a receipt. This time, I just grabbed an old 8GB USB and dropped it in. Looks like it only uses 3GB. Does Atlas plan to pursue warranty claim, or is this an acceptable failure level for the probes?