Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Many problems with this reader

Have had massive problems with two of these readers that I bought for work. One of them repeatedly disappears from my computer after I read and remove a card, and I have to reboot to bring it back. The other has somehow corrupted two Smartmedia cards and made them unusable. Zio supposedly has a firmware upgrade but so far has not actually sent it, nor is it available on their website, not to mention they said you can only install it with a Win98 system... Avoid this product, by all means.