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San Francisco to pay $212 million to end reliance on 5.25-inch floppy disks
Muni Metro also plans to ditch super-slow loop cable communication system.
The Muni Metro’s Automatic Train Control System (ATCS) has required 5¼-inch floppy disks since 1998, when it was installed at San Francisco’s Market Street subway station. The system still works fine, but the risk of floppy disk data degradation and challenges in maintaining expertise in 1990s programming languages have further encouraged the SFMTA to seek upgrades. In addition to old storage formats and the communication infrastructure, the Muni's current ATCS includes onboard computers tied to propulsion and brake systems, as well as local and central servers, and more.
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