What MES does
An MES is the system of record for everything that happens to a single unit on a factory floor. As your module moves from reel feeder to placement to AOI to programming to test, the MES records what reel was used, what placement program ran, what the AOI verdict was, what the test result was - all keyed against the unit's serial number.
Why a buyer should care
Two reasons. First, when something goes wrong - a returned module that flagged an error in the field - the MES lets you reconstruct exactly what happened to that unit at the factory. You can trace it back to the chip lot, the reel, the operator, the test record. Second, that same audit trail lets a buyer answer questions from their own auditors and customers without guessing.
How to ask about it
When evaluating a memory or storage supplier, ask three questions: "Is every unit serialised at the line?", "What is retained against the serial?", and "How fast can you produce the operational history of a single returned unit?" A serious supplier should be able to answer all three in concrete terms.
Where ZION sits
Every module on the Daman floor passes through MES at the programming station. Reel lot, placement record, AOI verdict, programming record, and final-QA result are all retained against the unit's serial. We can produce a unit's full operational history from its serial in minutes.