# CFOUR_INCORE

> This keyword can be used to significantly reduce disk i/o, and should be implemented very soon. The following options are available: OFF (= 0), no special algorithms are used (the default case); ALL (=1) all quantities except the molecular integral lists are held in core; PARTIAL (= 2), the T2 and T1 vectors are held in core throughout the calculation; (=4) all quantities except the and integrals are held in core; (=5) and and two-index quantities are held in core; (=6) all direct access files (`MOINTS`, `GAMLAM`, etc.) are held in core. At present, these options have been implemented only in the energy code `xvcc` and the excitation energy code `xvee`. (Default: 0)

> - Type: string
> - Possible Values: OFF, ALL, PARTIAL
> - Default: OFF