You need to re-word your question, it's very hard to figure out what you did. Are you talking about a "Drive" or a "Partition"? You can't just make a new drive, but a partition you can. You may want to post on a native language forum for you, your translation to English is probably the issue as to why you did not explain things very well.
Did you make a dual boot system with Windows 7 and Windows 8 but can't see the Windows 8 files from 7? Can't see that second partition at all? Are the partitions showing up in Disk Manager? You may just need to assign that second partition a drive letter for it to show up.