Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Unreliable

I bought this drive to replace my Lexar drive after my dog chewed up it's case. I've had this drive for five months and I've just had it fail for the second time. The first time it failed no computer would recognize it as a flash drive. This time no computer would even recognize that anything was plugged in to the USB port. Sandisk has been very good about supplying me with a replacement, but I no longer trust it a reliable backup for my important data. All the while my mangled Lexar drive has been a reliable substitute while the Sandisk drive is in the shipping process.