Spanned volume diirectory

It is my understanding that the spanned volume feature of Windows 2000, allows you to combine seperate pieces of storage space into one logical drive. On my system, the Properties sheet for Sys(C:) shows used space to be approximately 75 % of total space. Therefore I went to the end of the drive, and created a spanned drive. Now when I right click on the same space, and then click on Change Driver letter and Paths, it says Sys(C:)\Sys. However, when I clcik on Sys (C:), then click on Properties, it dispalys the same total space as before connecting the rive segments. Shouldn’t it show the total space available on the logical drive partition?