From Ubuntu I can see C and D partitions of Windows and I can look, change, delete and create anything in those partitions. Because I have a small HDD on my laptop (120 GB) I would make Windows partitions bigger and use them as storage for anything like pictures or so.
Is there any danger or advice I should not do that, can anything go wrong with using those partitions from Ubuntu? So it is clean install I didn't do no sharing or permissions, it is just like that.