OS Storage/root disk holds your OS and related data. This is the place where the Operating System resides.
Users with Administrative privilege may have to contact InfinCE Support to get upgrades for OS storages if required.
The information regarding the usage of this storage is given on the Administration->Servers -> InfinCE Workplace
InfinCE Workplace Server details under Administration > Servers
The status of the OS Storage is being monitored by the InfinCE Support team. If an upgrade is required, users with Administrative privilege will be contacted for necessary follow up action.