When I run "grub2-mkconfig" on my CentOS-7.1 desktop I get the warning (4 times) /usr/sbin/grub2-probe: error: cannot find a GRUB drive for /dev/block/8. Check your device.map. What exactly does this mean? My device map looks perfectly normal to me: [root at helen ~]# cat /boot/grub2/device.map (hd0) /dev/sda (hd1) /dev/sdb This makes me reluctant to boot into CentOS-7.2. An additional, possibly related, query. When I run grub2-mkconfig it lists various OS's it finds: ========================= Found Windows 7 (loader) on /dev/sda1 Found CentOS Linux release 7.1.1503 (Core) on /dev/sda12 Found Windows 7 (loader) on /dev/sdb1 Found CentOS release 6.5 (Final) on /dev/sdb5 Found CentOS release 5.6 (Final) on /dev/sdc7 done ========================= Why does it not list CentOS 7.2 since it ========================= Found linux image: /boot/vmlinuz-3.10.0-327.4.4.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-327.4.4.el7.x86_64.img ========================= -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin