Santa Cruz unit at Perryville operates as a medium security facility and still uses cells rather than the open dormitory setup you find at minimum security units like San Carlos.
The distinction matters in terms of daily life. Medium security means one to two-person cells with controlled movement throughout the facility. Inmates do not move freely between areas without authorization, and the environment is more structured and restricted than what minimum security offers.
San Carlos by contrast, is minimum security, which means open dormitory-style housing similar to military barracks. A large number of inmates share one open space with limited supervision and considerably more freedom of movement. The population at minimum security tends to be lower risk with shorter sentences or inmates who have stepped down through the custody level system over time.
Santa Cruz being medium security reflects a stricter environment with more oversight and less personal freedom than the dorm setting. For someone housed there, daily life involves more movement restrictions, more supervision, and a more controlled schedule than they would experience at a minimum security unit.
If your person is at Santa Cruz and working toward a step down in custody level, maintaining a clean disciplinary record and engaging with available programming are the factors that eventually move someone from medium to minimum and into that more open dormitory environment. That progression takes time and a consistent record but it is the path toward easier day to day conditions.