correct. Ubuntu, kubuntu and other Linux distros format their partitions/drives in Ext3. Win does not read that type, in Drive manager that partition/drive will show up as unknown type. On the other hand, linux can read NTFS, which is what Windows uses (that, or FAT). So, from kubuntu, you should be able to see the "Windows" drive.
There is no problem with the drives, it's just the way they are formatted.