If you have just accidentally deleted a partition on harddisk, you may recover it with TestDisk, a free data recovery software.
Warning: I won't responsible in any damage or failure that may happened if you're using this tool so use at your own risk.
TestDisk - CGSecurity
http://www.cgsecurity.org/wiki/TestDisk
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If you can't recover partition with this tool, you could try MiniTool Partition Wizard
Recover lost partition on Windows with MiniTool Partition Wizard
https://www.youtube.com/watch?v=c3ljEd8
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