Just how important is that data you just lost when you formatted a hard drive accidentally? Not sure how to get it back? If you think it is worth more than $129, then Seagate has a piece of software you may want to try. Their File Recovery for Windows is made to retrieve files that have been lost, whether through accidentally deleting them from the Recycle Bin, having formatted that drive or maybe some damage done by a virus.
One nice feature is that they allow you to download the software and take a look at your hard drive to determine if the files are recoverable before you decide to purchase the software. The software does not require that you have a Seagate drive installed to use it.
Works with any Microsoft Windows Fat12/16/32 or NTFS partition.