Accidentally overwrote my HD

[KonoChrome]

While trying to make a bootable iso flash drive with windows in bootcamp i accidentally overwrote my (old) hard drive. i recently installed an ssd and i had my old hard drive in a usb case. i did not transfer all of my files yet to save time and space. the iso for windows remained on my old hd and i had to plug it in to install it. while trying to overwrite the flash drive bootcamp overwrote my hd (the one with the file on it). the windows file was only 3gb and suspect did not overwrite much. And i used the free diskdoctor tool to find (not recover) my files all of my pictures are still there but are jumbled up in a mess of files.

Is there a (free) way to boot my drive back into its file system mode so that i can just drag and drop the files i need in their original file folders?

[chscag]

Is there a (free) way to boot my drive back into its file system mode so that i can just drag and drop the files i need in their original file folders?

The problem you have is that you overwrote the file table on that external drive so that the pointers to the files that were not overwritten by what the Boot Camp assistant wrote are now lost. You need to use a file recovery program for Windows that can possibly find the files. Even if they're found, chances are the file names have been altered.