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## 4.3 File space requirements

A typical `pw.x` run will require an amount of temporary disk space in the order of O double precision complex numbers:

O = NkMN + qNr1Nr2Nr3

where q = 2× `mixing_ndim` (number of iterations used in self-consistency, default value = 8) if `disk_io` is set to 'high'; q = 0 otherwise.