Use a labelling method suited to frozen storage and apply it before the package becomes frosty. Include enough information to identify the food and its storage date.
What the observation tells you
A loose paper note can separate from the item, while ordinary ink may wipe from damp plastic. Guessing whether a block contains raw or cooked food creates avoidable preparation risk. A drawer inventory helps but should not replace labels on individual portions.
A useful next step
Choose suitable labels or a compatible marker, keep the original preparation instructions where needed and rotate older items visibly. If an unidentified item cannot be assessed safely, do not rely on taste to identify it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.