Thread Subject: Workspace out of memory??

I'm doing some long simulation with my simulink model and I found a serious problem.
 Basically the model, with the "To workspace" block, write a column of data into the workspace, one each 0.1 seconds.
After around 50/60 seconds, so 500/600 values, the workspace start to replace first values it registered with new ones, like if its out of space!! So for example if I run a simulation from 0 to 6 bar with a low flow, at the end of it I'll have only the datas from 4 to 6 bar!
The "To Workspace" block "Limit data points" its already set to "inf"