Description of problem:
The system is not starting normally, every time I turn on my computer, the system will not boot, appears only the terminal requesting root access to perform maintenance or type Ctrl + d to continue, then preciono Ctrl + deo system starts after a few minutes. 
Then when the system is started, I access with my User then to open the terminal, root access and I try to update the system, but I can not, the system returns this error "[Errno 5] Erro de entrada/saída: '/var/cache/yum/x86_64/20/rpmfusion-nonfree/mirrorlist.txt".

[rafapinho@localhost ~]$ su -
Senha:
Último login:Dom Out 12 21:13:50 BRT 2014em pts/0
[root@localhost ~]# 
[root@localhost ~]# yum update
Plugins carregados: langpacks, refresh-packagekit


[Errno 5] Erro de entrada/saída: '/var/cache/yum/x86_64/20/rpmfusion-nonfree/mirrorlist.txt'
[root@localhost ~]# date
Dom Out 12 22:53:18 BRT 2014
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.16.4-200.fc20.x86_64 #1 SMP Mon Oct 6 12:57:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# 

Version-Release number of selected component:
yum-3.4.3-152.fc20

Additional info:
reporter:       libreport-2.2.3
cmdline:        /usr/bin/python /bin/yum clean headers
executable:     /bin/yum
kernel:         3.16.4-200.fc20.x86_64
runlevel:       3 5
type:           Python
uid:            0

Truncated backtrace:
yumRepo.py:710:_dirSetupMkdir_p:RepoError: Error making cache directory: /var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen error was: [Errno 5] Erro de entrada/saída: '/var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen'

Traceback (most recent call last):
  File "/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 371, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 178, in main
    return exRepoError(e)
  File "/usr/share/yum-cli/yummain.py", line 74, in exRepoError
    base.cleanExpireCache()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 2815, in cleanExpireCache
    return self._cleanFiles(exts, 'cachedir', 'metadata')
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 2831, in _cleanFiles
    path = getattr(repo, pathattr)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 771, in <lambda>
    cachedir = property(lambda self: self._dirGetAttr('cachedir'))
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 754, in _dirGetAttr
    self.dirSetup()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 733, in dirSetup
    self._dirSetupMkdir_p(dir)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 710, in _dirSetupMkdir_p
    raise Errors.RepoError(msg, repo=self)
RepoError: Error making cache directory: /var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen error was: [Errno 5] Erro de entrada/saída: '/var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen'

Local variables in innermost frame:
msg: "Error making cache directory: /var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen error was: [Errno 5] Erro de entrada/sa\xc3\xadda: '/var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen'"
dpath: '/var/cache/yum/x86_64/20/rpmfusion-nonfree-updates/gen'
self: <yum.yumRepo.YumRepository object at 0x2bbd910>
e: OSError(5, 'Erro de entrada/sa\xc3\xadda')