If your hard drive can be detected and shows up as a drive letter in my computer but you can't access your files,then you can recover your data off it with data recovery software easily.
This way is the easiest and the most inexpensive way to recover your data.I managed to recover data from crashed hard drive with mac Data Recoverysoftware.
If needed,you can download it and scan your hard drive for free to preview whether your data can be recovered.It will show you thumbnails for recoverable pictures. Get it from:
| http://www.recoverfilesdata.com/ |
use free demo version.