I think there is a bit confusion about the term emulating USB-ZIP or USB-FDD. 1) For me emulating USB-ZIP means (any device, such as this USB-pendrive) claims to be (real USB-ZIP). Or emulating USB-FDD means (any device, such as this USB-pendrive) claims to be (real USB-FDD). I suspect this real emulating can only be done on hardware / firmware level and is not possible for normal end users. So either you buy a device with this feature or not...
Sourdough is dough which has microorganisms (for example lactobacillus or yeast) from sourdough or sourdough starters, which are active or can be reactivited. With the addition of grain products and water, they are capable of continuous acid generation.
From a scientific perspective, a sourdough starter is a natural leaven-a mixture of grains and liquid (usually flour and water) inhabited by so-called wild yeasts and bacteria which leaven and flavor bread dough.t may or may not be a sour bread, depending on the characteristics of the starter. Sourdough: An American term for a natural leaven of wild or natural yeast and lactobacilli. Also the process of leavening bread with a natural leaven. Yeasted Starter: A starter containing commercial bakers' yeast.