Partition a hard drive often causes data loss and I would advise to stop any further use of the HDD because any read/write operation can overwrite the deleted data. Here are the list of data recovery software which you can choose from.
* Stellar Phoenix Mac Data Recovery - free preview of files, real recovery is paid (99 USD)
* Data Rescue 3 - free preview of files, real recovery is paid (99 USD)
* FileSalvage free preview of files, real recovery is paid (99 USD)
* DiskDrill - free preview of files, real recovery is paid (79 USD)
* Nice To Recover - free preview of files, real recovery is paid (69.95 USD)
Make your choice wisely.
Thanks