Public bug reported:

Binary package hint: mdadm

For some reason, gparted fails to format a new partition where I used to
have an old, deleted RAID set. To reproduce (maybe):

1. Create raid1 set with mdadm (/dev/sdd1 and /dev/sde1)
2. Delete partition (/dev/sdd1)
3. Reboot (just to make sure /dev/sdd1 should be gone everywhere)
4. Try to create a new ext3 formatted partition using gparted

Expected: Create and format succeeds
Actual: mkfs fails with: "/dev/sdd1 is apparently in use by the system: will 
not make a file system here" that was just created?!

I'm not sure where the real problem is, if it's in mkfs, gparted, mdadm,
the kernel, but somewhere it's keeping traces of sdd1 which prevents me
from using the disk. mdadm says the raid set is not active so it won't
let met do anything with it there, gparted refuses to work so I'm stuck.

mdadm:
  Installed: 2.6.3+200709292116+4450e59-3ubuntu3.1

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Old raid array blocks format of new partition
https://bugs.launchpad.net/bugs/342777
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