There appears to be more to it than just Brasero. Shortly after ejecting the disk, the icon comes back and dmesg floods with the following message:
[12728.420820] VFS: busy inodes on changed media or resized disk sr0
[12728.424706] VFS: busy inodes on changed media or resized disk sr0
[12728.428619] VFS: busy inodes on changed media or resized disk sr0
[12730.417739] VFS: busy inodes on changed media or resized disk sr0
[12730.420310] VFS: busy inodes on changed media or resized disk sr0
[12730.423987] VFS: busy inodes on changed media or resized disk sr0
[12732.419591] VFS: busy inodes on changed media or resized disk sr0
[12732.422445] VFS: busy inodes on changed media or resized disk sr0
[12732.427825] VFS: busy inodes on changed media or resized disk sr0
[12734.420404] VFS: busy inodes on changed media or resized disk sr0
[12734.424422] VFS: busy inodes on changed media or resized disk sr0
[12734.431626] VFS: busy inodes on changed media or resized disk sr0
[12736.419552] VFS: busy inodes on changed media or resized disk sr0
[12736.422786] VFS: busy inodes on changed media or resized disk sr0
[12736.426553] VFS: busy inodes on changed media or resized disk sr0
[12738.420037] VFS: busy inodes on changed media or resized disk sr0
[12738.423484] VFS: busy inodes on changed media or resized disk sr0
[12738.427539] VFS: busy inodes on changed media or resized disk sr0
[12740.420095] VFS: busy inodes on changed media or resized disk sr0
[12740.423564] VFS: busy inodes on changed media or resized disk sr0
[12740.427443] VFS: busy inodes on changed media or resized disk sr0
[12742.420377] VFS: busy inodes on changed media or resized disk sr0
[12742.424672] VFS: busy inodes on changed media or resized disk sr0
[12742.428657] VFS: busy inodes on changed media or resized disk sr0
[12744.420661] VFS: busy inodes on changed media or resized disk sr0
[12744.424569] VFS: busy inodes on changed media or resized disk sr0
[12744.428670] VFS: busy inodes on changed media or resized disk sr0
[12746.419820] VFS: busy inodes on changed media or resized disk sr0
[12746.423080] VFS: busy inodes on changed media or resized disk sr0
[12746.428019] VFS: busy inodes on changed media or resized disk sr0
[12748.421445] VFS: busy inodes on changed media or resized disk sr0
[12748.425201] VFS: busy inodes on changed media or resized disk sr0
[12748.429217] VFS: busy inodes on changed media or resized disk sr0
[12750.420353] VFS: busy inodes on changed media or resized disk sr0
[12750.423884] VFS: busy inodes on changed media or resized disk sr0
[12750.427881] VFS: busy inodes on changed media or resized disk sr0
[12752.420099] VFS: busy inodes on changed media or resized disk sr0
[12752.423006] VFS: busy inodes on changed media or resized disk sr0
[12752.426960] VFS: busy inodes on changed media or resized disk sr0
[12754.420976] VFS: busy inodes on changed media or resized disk sr0
[12754.424656] VFS: busy inodes on changed media or resized disk sr0
[12754.428777] VFS: busy inodes on changed media or resized disk sr0
[12756.420004] VFS: busy inodes on changed media or resized disk sr0
[12756.423159] VFS: busy inodes on changed media or resized disk sr0
[12756.426979] VFS: busy inodes on changed media or resized disk sr0
[12758.421416] VFS: busy inodes on changed media or resized disk sr0
[12758.424087] VFS: busy inodes on changed media or resized disk sr0
[12758.427679] VFS: busy inodes on changed media or resized disk sr0
There appears to be more to it than just Brasero. Shortly after ejecting the disk, the icon comes back and dmesg floods with the following message:
[12728.420820] VFS: busy inodes on changed media or resized disk sr0
[12728.424706] VFS: busy inodes on changed media or resized disk sr0
[12728.428619] VFS: busy inodes on changed media or resized disk sr0
[12730.417739] VFS: busy inodes on changed media or resized disk sr0
[12730.420310] VFS: busy inodes on changed media or resized disk sr0
[12730.423987] VFS: busy inodes on changed media or resized disk sr0
[12732.419591] VFS: busy inodes on changed media or resized disk sr0
[12732.422445] VFS: busy inodes on changed media or resized disk sr0
[12732.427825] VFS: busy inodes on changed media or resized disk sr0
[12734.420404] VFS: busy inodes on changed media or resized disk sr0
[12734.424422] VFS: busy inodes on changed media or resized disk sr0
[12734.431626] VFS: busy inodes on changed media or resized disk sr0
[12736.419552] VFS: busy inodes on changed media or resized disk sr0
[12736.422786] VFS: busy inodes on changed media or resized disk sr0
[12736.426553] VFS: busy inodes on changed media or resized disk sr0
[12738.420037] VFS: busy inodes on changed media or resized disk sr0
[12738.423484] VFS: busy inodes on changed media or resized disk sr0
[12738.427539] VFS: busy inodes on changed media or resized disk sr0
[12740.420095] VFS: busy inodes on changed media or resized disk sr0
[12740.423564] VFS: busy inodes on changed media or resized disk sr0
[12740.427443] VFS: busy inodes on changed media or resized disk sr0
[12742.420377] VFS: busy inodes on changed media or resized disk sr0
[12742.424672] VFS: busy inodes on changed media or resized disk sr0
[12742.428657] VFS: busy inodes on changed media or resized disk sr0
[12744.420661] VFS: busy inodes on changed media or resized disk sr0
[12744.424569] VFS: busy inodes on changed media or resized disk sr0
[12744.428670] VFS: busy inodes on changed media or resized disk sr0
[12746.419820] VFS: busy inodes on changed media or resized disk sr0
[12746.423080] VFS: busy inodes on changed media or resized disk sr0
[12746.428019] VFS: busy inodes on changed media or resized disk sr0
[12748.421445] VFS: busy inodes on changed media or resized disk sr0
[12748.425201] VFS: busy inodes on changed media or resized disk sr0
[12748.429217] VFS: busy inodes on changed media or resized disk sr0
[12750.420353] VFS: busy inodes on changed media or resized disk sr0
[12750.423884] VFS: busy inodes on changed media or resized disk sr0
[12750.427881] VFS: busy inodes on changed media or resized disk sr0
[12752.420099] VFS: busy inodes on changed media or resized disk sr0
[12752.423006] VFS: busy inodes on changed media or resized disk sr0
[12752.426960] VFS: busy inodes on changed media or resized disk sr0
[12754.420976] VFS: busy inodes on changed media or resized disk sr0
[12754.424656] VFS: busy inodes on changed media or resized disk sr0
[12754.428777] VFS: busy inodes on changed media or resized disk sr0
[12756.420004] VFS: busy inodes on changed media or resized disk sr0
[12756.423159] VFS: busy inodes on changed media or resized disk sr0
[12756.426979] VFS: busy inodes on changed media or resized disk sr0
[12758.421416] VFS: busy inodes on changed media or resized disk sr0
[12758.424087] VFS: busy inodes on changed media or resized disk sr0
[12758.427679] VFS: busy inodes on changed media or resized disk sr0