ایولل یکی دیگه جواب داد!
all accounts will have unlimited diskspace if you have not enabled cpanel quota.

Below are the exact steps to enable quota in your cpanel server:

# you first have to edit /etc/fstab

nano /etc/fstab

# locate the line that looks something like

label=/1 / ext3 defaults 1 1

# add after “defaults” the word “usrquota”. It should look something like

label=/1 / ext3 defaults,usrquota 1 1

# save and exit
# remount the / partition

mount -o remount /

# now run the cpanel script to fixquotas

/scripts/fixquotas

thanks!