最近更新总出现corrupted错误

下载的时候会出现下面：

checking package integrity...
:: File python-2.6.3-2-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File vim-7.2.266-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File libmysqlclient-5.1.39-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File mysql-clients-5.1.39-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File mysql-5.1.39-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File redland-1.0.9-4-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File openoffice-base-devel-3.2_dev300_m61-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File ortp-0.16.1-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File perl-locale-gettext-1.05-5-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File php-5.3.0-5-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File pidgin-2.6.2-3-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File pstoedit-3.50-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File sip-4.9.0-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File qt-4.5.3-3-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File pyqt-4.6.0-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File ruby-1.9.1_p243-2-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File slim-1.3.1-4-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File subversion-1.6.5-5-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File terminal-0.4.1-1-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File w3m-0.5.2-4-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y
:: File xfconf-4.6.1-2-x86_64.pkg.tar.gz is corrupted. Do you want to delete it? [Y/n] y

全选y之后（选n也一样），出现：

error: failed to commit transaction (invalid or corrupted package)
python-2.6.3-2-x86_64.pkg.tar.gz is invalid or corrupted
vim-7.2.266-1-x86_64.pkg.tar.gz is invalid or corrupted
libmysqlclient-5.1.39-1-x86_64.pkg.tar.gz is invalid or corrupted
mysql-clients-5.1.39-1-x86_64.pkg.tar.gz is invalid or corrupted
mysql-5.1.39-1-x86_64.pkg.tar.gz is invalid or corrupted
redland-1.0.9-4-x86_64.pkg.tar.gz is invalid or corrupted
openoffice-base-devel-3.2_dev300_m61-1-x86_64.pkg.tar.gz is invalid or corrupted
ortp-0.16.1-1-x86_64.pkg.tar.gz is invalid or corrupted
perl-locale-gettext-1.05-5-x86_64.pkg.tar.gz is invalid or corrupted
php-5.3.0-5-x86_64.pkg.tar.gz is invalid or corrupted
pidgin-2.6.2-3-x86_64.pkg.tar.gz is invalid or corrupted
pstoedit-3.50-1-x86_64.pkg.tar.gz is invalid or corrupted
sip-4.9.0-1-x86_64.pkg.tar.gz is invalid or corrupted
qt-4.5.3-3-x86_64.pkg.tar.gz is invalid or corrupted
pyqt-4.6.0-1-x86_64.pkg.tar.gz is invalid or corrupted
ruby-1.9.1_p243-2-x86_64.pkg.tar.gz is invalid or corrupted
slim-1.3.1-4-x86_64.pkg.tar.gz is invalid or corrupted
subversion-1.6.5-5-x86_64.pkg.tar.gz is invalid or corrupted
terminal-0.4.1-1-x86_64.pkg.tar.gz is invalid or corrupted
w3m-0.5.2-4-x86_64.pkg.tar.gz is invalid or corrupted
xfconf-4.6.1-2-x86_64.pkg.tar.gz is invalid or corrupted
Errors occurred, no packages were upgraded.

总之就是不能升级，我把包下载完，然后手动加上f升级，还是不行，现在用的bjtu的源，因为是教育网，所以很快，之前用sjtu的源，也出现过这样的情况，当时因为冲突的包少，我就手动卸载了，之后就能成功。现在这么多包，实在是懒得手动卸载了。

应该是源的问题。。

可能是新版pacman的问题, 我最近经常会下载到几十个G的包, 硬盘瞬间占满.