I'm using ubuntu 9.10 with kernel 2.6.31. In addition to the boot disk, I have a software raid of 5 disks using mdadm. One disk failed. I removed it from the array. mdadm --detail /dev/md0 shows:

0       8       17        0      active sync   /dev/sdb1
1       8       33        1      active sync   /dev/sdc1
2       8       49        2      active sync   /dev/sdd1
3       0        0        3      removed
4       8       81        4      active sync   /dev/sdf1

I installed a new disk in /dev/sde, but after I format it, I can't get the device /dev/sde1 to exist.

enter image description here

Then I reboot for good measure. After:

enter image description here

  • I've tried fdisk, parted, and gparted. I get the same behavior after formatting in all programs.
  • The partition is not listed in /proc/partitions
  • There are no strange messages in /var/log/messages
  • All drives are listed in BIOS, including SDE
  • My dmesg output is available here: http://pastebin.com/BX6ya3qx

I'd add the /dev/sde1 manually with MAKEDEV, but this uses udev, so I don't know what to do. How do I get the /dev/sde1 device to appear?

  • inlined, ad made a tiny edit so that it makes sense that i did inline them
    – Journeyman Geek
    Apr 30, 2011 at 1:20
  • Thanks for your help Journeyman Geek. I realized I'm actually using Ubuntu-9.10. I'll edit my question once I have 10 rep. Apr 30, 2011 at 14:07
  • edited for you - you can get rep, iirc, by ensuring your profile is filled up.
    – Journeyman Geek
    Apr 30, 2011 at 14:55

1 Answer 1


I upgraded to Ubuntu 10.04 LTS and it magically started working. I can only assume it is a kernel or distribution issue.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.