If you are having issues saving file to your home directory (Unix) or your Z: Drive (Windows), you might have exceeded your disk quota.
Quotas are used to limit the amount of disk space used and the total number of files of each user. Disk space used is measured in blocks, where 1 block equals 1024 bytes(1KB).
There are two values (called limits) — a soft limit and a hard limit — for both the disk space used quota and the number of files quota. You can continue to increase your usage over the soft limit until you either reach the hard limit or the established time limit (usually a week). Once the hard limit has been reached, all further attempts at file creation will fail with an error message.
The simplest way to view your disk quota is to visit the School of Computing Account Management Utility (AMU) page at https://cse.unl.edu/account. After login, the AMU page shows various details about your account including your disk quota and usage.
To check your disk quota under Unix, use the command "quota -v" at the Unix command shell prompt.