Unable to update plugin.

Hi all,

I am using wordpress version 3.3.1

I am unable to update any of my plugins
if i try to do that it throws this error "Download failed. Failed writing body (1498 != 4380)" As per the other post here, this error is due to lack of disk space. But i have plenty of disk space available.

Can any one help me how to resolve this issue

Thanks
Harsha.