On Ubuntu 12.04, I'm trying to create a second disk for a VM. The disk seems work well (and mounted) but I don't like the cfdisk / fdisk message. # virt-make-fs --partition --size=+300M --type=ext3 --format=qcow2 srv-2912.tar.gz datadisk-test.qcow2 Formatting 'datadisk-test.qcow2', fmt=qcow2 size=393837568 encryption=off cluster_size=65536 # virt-filesystems -a datadisk-test.qcow2 /dev/sda1 I add the disk on the VM: <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/srv/kvm/lib/datadisk-test.qcow2'/> <target dev='hdb' bus='ide'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> The dmesg seems good : [ 1.404447] scsi 1:0:0:0: Direct-Access ATA QEMU HARDDISK 1.0 PQ: 0 ANSI: 5 [ 1.545945] sd 0:0:0:0: [sda] 8388608 512-byte logical blocks: (4.29 GB/4.00 GiB) [ 1.554467] sd 1:0:0:0: [sdb] 769214 512-byte logical blocks: (393 MB/375 MiB) [ 1.555975] sd 1:0:0:0: [sdb] Write Protect is off [ 1.556943] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [ 1.556969] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.559923] sdb: [ 1.560603] sd 0:0:0:0: [sda] Write Protect is off [ 1.561837] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 1.561864] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.563637] sda: sdb1 But fdisk said : Command (m for help): p Disk /dev/sdb: 393 MB, 393837568 bytes 223 heads, 46 sectors/track, 74 cylinders Units = cylinders of 10258 * 512 = 5252096 bytes Disk identifier: 0x0002345e Device Boot Start End Blocks Id System /dev/sdb1 1 75 384479+ 83 Linux Partition 1 has different physical/logical beginnings (non-Linux?): phys=(0, 2, 3) logical=(0, 2, 37) Partition 1 has different physical/logical endings: phys=(47, 222, 46) logical=(74, 217, 13) And cfdisk: FATAL ERROR: Bad primary partition 0: Partition ends in the final partial cylinder Have I missed something? Any ideas?