That is still how plenty of microSD duplication jobs work. The CID Is One of the More Interesting Parts of a microSD CardEvery microSD card contains a Card Identification register, usually referred to simply as the CID. Unique Data Streaming Changes the Production ModelPerhaps the more interesting capability is unique data streaming. Production quantities, verification, traceability, unique data, CID handling and hardware-level data protection introduce requirements that aren’t addressed by ordinary card readers or basic cloning equipment. The objective isn’t always to make hundreds of identical microSD cards.