Generally if you drag & drop files across disks on Mac Finder window they are copied and not moved. But there is no Ctrl-X Ctrl-V kind of short cut to cut paste the files.
To cut-paste (move) press Command key and drag & drop files.
- Tutorial: 50 tips to get you started with your new Mac (techradar.com)
- Five unexpected uses for Copy and Paste (macworld.com)
- Total Finder for the Mac Review (techbookshelf.com)