A controller + microSD card is not really an "open source" flash drive, because probably the card itself has a more complex proprietary microcontroller inside.
Try parsing this file https://github.com/jaw0/usb-crypto-jawn/blob/master/cad/usb415.sch
for used components.
Is there anything thatd be closer to a open source flash drive/storage device?
Something that has DIY controller, and bare silicon memory chips.http://www.openssd-project.org/wiki/The_OpenSSD_Project
doesnt seem like that is available to purchase or even to build tho
shouldn't making a fully open source USB pretty simple thing now?
the problem is finding an open microcontroller.
Some people are working on the first one:https://hackaday.com/2017/01/05/hands-on-with-the-first-open-source-microcontroller/
But even this is not 100% open, as explained in the article.
jeez that sucks =\
what about this u2f zero though isnt this completely open source? it stores some data in it http://u2fzero.com/