I've a disk that been GPT-formatted before, but now there's just MBR: $ sudo sfdisk -l /dev/sdc Disk /dev/sdc: 14.9 GiB, 16025444352 bytes, 31299696 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x79215d34 Device Boot Start End Sectors Size Id Type /dev/sdc1 2048 31299695 31297648 14.9G 83 Linux Fine, but magically, both "/dev/disk/by-label/" and lsblk shows names/labels that been there before the disk reformatted into MBR! $ sudo lsblk -o name,mountpoint,label,size,uuid /dev/sdc NAME MOUNTPOINT LABEL SIZE UUID sdc Ubuntu 15.10 amd64 14.9G 2015-10-21-16-17-40-00 └─sdc1 Ubuntu 15.10 amd64 14.9G 502229b0-6d02-46ee-8fd1-b3321f11e53f It causes errors with grub-install like "Attempting to install GRUB to a disk with multiple partition labels. This is not supported yet..". So I want to just remove those names. But "sgdisk" sees that GPT table is invalid, and tries to reconstruct it from MBR, whilst I'd need to force it into thinking like it is valid, so that it see the damn names. Thankfully, there's sfdisk with -X option: $ sudo sfdisk -lX gpt /dev/sdc Disk /dev/sdc: 14.9 GiB, 16025444352 bytes, 31299696 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x79215d34 Device Boot Start End Sectors Size Id Type /dev/sdc1 2048 31299695 31297648 14.9G 83 Linux It worked… Or not? "Disklabel" says "dos", and most importantly, I see no partition names. Turns out, sfdisk would print the same information for pretty much anything, i.e. even for "sfdisk -X foo", so the option just doesn't work. -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
