When I use photoshop 7 to save a file to the NAS, why does it always show Disk Full?

Question:

When I use photoshop 7 to save a file to the Ciphertex NAS, why does it always show Disk Full?

Answer:

Photoshop 7 can not correctly recognize disk space larger than 1TB.
Workaround - Use the Quota function to restrict the available disk size for certain user accounts to less than 1TB.
The user will then be able login with the accounts that have less than 1TB available space and avoid this problem.