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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fdisk Operation not supported error","articleBody":"Hello, I recently tried to find the problems with some storage devices someone gave me. In one micro sd card I saw that it would be recognized, but wouldn't get mounted. I tried formatting and mounting but to no avail.\n\n`fdisk -l stdout`\n\n```\nDisk /dev/sdc: 29,12 GiB, 31266439168 bytes, 61067264 sectors\nDisk model: MassStorageClass\nUnits: sectors of 1 * 512 = 512 bytes\nSector size (logical/physical): 512 bytes / 512 bytes\nI/O size (minimum/optimal): 512 bytes / 512 bytes\nDisklabel type: dos\nDisk identifier: 0x6f20736b\n\nDevice     Boot      Start        End    Sectors   Size Id Type\n/dev/sdc1        778135908 1919645538 1141509631 544,3G 72 unknown\n/dev/sdc2        168689522 2104717761 1936028240 923,2G 65 Novell Netware 386\n/dev/sdc3       1869881465 3805909656 1936028192 923,2G 79 unknown\n/dev/sdc4       2885681152 2885736650      55499  27,1M  d unknown\n\n```\n`fdisk /dev/sdc stdout`\n\n```\nWelcome to fdisk (util-linux 2.39.3).\nChanges will remain in memory only, until you decide to write them.\nBe careful before using the write command.\n\nfdisk: cannot open /dev/sdc: Operation not supported\n```\nI never seen this error and couldn't find it anywhere","author":{"url":"https://github.com/MrLuxALot","@type":"Person","name":"MrLuxALot"},"datePublished":"2026-01-14T18:14:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/3970/util-linux/issues/3970"}