You CAN get it back, goto google and look up data recovery programs, some of them u may need to buy. They are the prgrams ocmputer foprensics (SP?) use to scan hdd for deleted items.
Macbook Pro 2.4ghs Intel Core 2 Duo, 4gigs ram
Mac Pro - 2x 3.0GHz Quad-Core Intel Xeon , 4x2gig 800MHz DDR2, 2x 1TB 7200-rpm Serial ATA 3Gb/s, NVIDIA GeForce 8800 GT 512MB