I have a external 1TB my book hdd that now says the directory is corrupted and unreadable and I don't know what happened to it. when I go to my computer and try to right click on it to run chkdsk on it nothing pops up i cant get to the properties it just freezes my computer. I was able to get to the properties for it by right clicking on it in disk management and when i ran the dskchk it only lasted a second and goes away not doing anything. I also noticed that the file system is now RAW it used to be NTFS. The hdd was almost full it had about 20GB free space so i need a way to get it working without losing all the stuff on it. I have tried opening command prompt and entering chkdsk g: /f /r it took several hours to complete and it didn't fix anything. I have ran testdisk and when i analyzed it it says it is NTFS an that everything is ok I am doing the "scan deeper" now. also when I ran chkdsk it also showed that the drive is NTFS. the deeper scan also say structure ok. the next step in test disk is write partition structure to disk should i do this or will it erase my stuff?