InfinCE System storage or the Core Server Storage holds your OS and related data.
This storage consists of two parts.
1. OS Storage/root disk where the Operating System resides,
2. Additional volume (DB Storage) which holds the database (for InfinCE Workplace).
Your InfinCE Administrator may have to contact InfinCE Support to get upgrades for these storages if required.
The information regarding the usage of these storages are given on the Administration->Servers -> InfinCE Workplace
The status of these storages are being monitored by the InfinCE Support team. If an upgrade is required, your InfinCE Administrator will be contacted for necessary follow up action.