"Memory-in-Casette" or MIC is a term coined by Sony for their AIT format tape cartridges

The term refers to a small amount of non-volatile memory that is readable and writeable by the tape drive allowing for the contents of the tape and the tape itself to be identified when the drive encounters that cartridge. In large tape backup environments this can go a long way to reducing media mounting errors. Additionally, this memory can store usage information for the tape's lifespan and indicate when it might be developing wear and need replacing.

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