Create partitions Welcome to fdisk . Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table. Created a new . Command (m for help): Partition type p primary (0 primary, 0 extended, 4 free) e extended (container for logical partitions) Select (default p): Partition number (1-4, default 1): First sector (2048-104447, default 2048): Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-104447, default 104447): Created a new . Command (m for help): Partition type p primary (1 primary, 0 extended, 3 free) e extended (container for logical partitions) Select (default p): Partition number (2-4, default 2): First sector (53248-104447, default 53248): Last sector, +/-sectors or +/-size{K,M,G,T,P} (53248-104447, default 104447): Created a new . Command (m for help): Disk : 51 MiB, 53477376 bytes, 104448 sectors Disk model: scsi_debug Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / bytes Disklabel type: dos Disk identifier: Device Boot Start End Sectors Size Id Type 1 2048 53247 51200 25M 83 Linux 2 53248 104447 51200 25M 83 Linux Command (m for help): The partition table has been altered. Calling ioctl() to re-read partition table. Syncing disks. Create RAID1 device Probe whole-disk ID_PART_TABLE_TYPE=dos ID_PART_TABLE_UUID=00000001 Probe first RAID member ID_FS_TYPE=linux_raid_member ID_FS_USAGE=raid ID_FS_UUID=__ts_uuid__ ID_FS_UUID_ENC=__ts_uuid_enc__ ID_FS_VERSION=0.90.0 ID_PART_ENTRY_DISK=__ts_majorminor__ ID_PART_ENTRY_NUMBER=1 ID_PART_ENTRY_OFFSET=2048 ID_PART_ENTRY_SCHEME=dos ID_PART_ENTRY_SIZE=51200 ID_PART_ENTRY_TYPE=0x83 ID_PART_ENTRY_UUID=00000001-01 Probe second RAID member ID_FS_TYPE=linux_raid_member ID_FS_USAGE=raid ID_FS_UUID=__ts_uuid__ ID_FS_UUID_ENC=__ts_uuid_enc__ ID_FS_VERSION=0.90.0 ID_PART_ENTRY_DISK=__ts_majorminor__ ID_PART_ENTRY_NUMBER=2 ID_PART_ENTRY_OFFSET=53248 ID_PART_ENTRY_SCHEME=dos ID_PART_ENTRY_SIZE=51200 ID_PART_ENTRY_TYPE=0x83 ID_PART_ENTRY_UUID=00000001-02