In the market,there are different grades chips(flash),such as upgrade flash.not enough capacity chip,and cheaper enough capacity flash,and orginal brand flash,original samsung flash.

Upgrade flash: it means that in fact it is 16mb,but someone use the soft to upgrade it to 2gb,4gb ,8gb ,16gb,32gb.

so you can get very very cheap flash from some suppliers. it will surprise you : )

Not enough capacity: For example,you want 4GB flash,in fact,it just has 3200MB or less capacity,so you will get cheaper price.

cheaper enough flash:Generally we use it to the promotional usb .Most of our customers use it as promotion gift.because we choose the very good cheaper enough capacity.it is no brand,and selected out by samsung,intel,Hynix company.but also good quality,there is almost no defect.because we will test all flash before producing,and test all products before shipping.

Original brand flash: Generally some customer request the high quality products,they will choose the original flash,the quality is very stable.

Samsung flash: it is best quality flash.and most expensive flash in the market. very lesst customer will choose it.

Generally,we use the cheaper enough flash,original brand flash,samsung flash.