Siemens cards (64KB to 8MB) are actually standard 16MB or 32MB cards with a unique internal signature . If you format them in Windows, the Siemens signature is lost, and the PLC will no longer recognize them. 2. Where to Download MMC Image Files
Siemens Micro Memory Cards (MMCs) are indispensable non-volatile storage components used primarily within the and S7-400 PLC families to store user programs, hardware configurations, and retentive data. Effective management of these cards often involves handling ".img" files—sector-by-sector physical copies that allow for complete restoration or duplication of a PLC's state. 1. Types of Siemens MMC Files
Siemens MMCs use a proprietary file system. If a card is accidentally formatted in a standard Windows environment, it becomes unusable by the PLC. To fix this, you must write a raw binary image back to the card. www.elsys.biz Software Tools : Widely used for sector-by-sector cloning of S7imgRD / S7imgWR
If you instead want a reply or solution for someone asking this question, let me know and I can provide the download/process instructions.