hi,sir I creat the filesystem with command mkfs.btrfs /dev/sda2, and it returns fs created label (null) on /dev/sda2 nodesize 4096 leafsize 4096 sectorsize 4096 size 2.93GB then I mount the /dev/sda2 with command mount -t btrfs /dev/sda2 /btrfs/, it returns mount: /dev/sda2: can''t read superblock. Why? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html