Hi Cesar,
When you see an ext drive that has RAW data, it usually means the File System has become corrupted, for whatever reason. Have you been moving the ext drive between different computers, or disconnecting it without using the "safe removal icon", or using it on a Win-XP computer?
Best thing to do is to go to Disk Management, and upload a screenshot of the Disk Management Dialog box, especially important is the lower graphical area. That will show everyone exactly what is recognized on your system and about the Disk Info and Volume Info.
Dont do anyting to the ext drive, like reformat it or initialize it, or write anything to it.
You will almost certainly need a Data Recovery Program, like the EaseUS Data Recovery Wizard (free 1st 1GB, then $69 for the commericial version), www.easeus.com/datarecoverywizard/, or the TenorShare Data recovery program (30 day free trial of the standard version). Google the Tenorshare web site for info about it. The TenorShare program talks about recovering RAW data on their website, which is worth reviewing.