Hi XYZ,
Generally speaking, SSD and HDD drives perform much better for this task, so although it is possible for some flash/stick style drive to work for recording/playback, they are generally not suitable so we don’t recommend them.
There are many variables as to why some drives don’t work well, such as speed or the data transfer method used – to name a couple, so there isn’t just one specification to look for.
We have some more details about this here: https://support.allen-heath.com/Knowledgebase/Article/View/1183
Thanks!
Alex