Hard Drive Data Recovery California

Is is possible to retrieve all your information back if you’ve deleted a partition on a hard drive? God I hope
I backed up my old hard drive onto a Maxtor external hard drive, because I needed to reformat my old hard drive. When I went to delete the old partition on my old hard drive, I still had the external hard drive hooked up to the computer. Needless to say, I accidentally deleted the partition of the external hard drive instead, removing all my needed info. Since I haven’t overwritten anything yet, is it still possible to retrieve ALL my old information on that hard drive? If so, does anybody know a good data recovery service in Southern California? I live in Huntington Beach, California. Please-please-please tell me I can salvage this!
Winzar32. http://www.z-a-recovery.com/download.htm
Its the best and I use it all the time.
HARD DRIVE DATA RECOVERY