I have a 500GB Seagate external USB hard drive that is formatted as NTFS. I recently decided to attach it to my Mac so I could manipulate some of the files on it. Once I realized that Macs by default do not write to NTFS drives, I downloaded and installed NTFS Mounter. At first, everything went as expected. I mounted the drive with NTFS Mounter, and I was able to write to the drive. After I ejected the drive, however, I began to have problems. I plugged the drive into my Windows machine, and it warned me that I had to format the drive. This struck me as odd, because I hadn't formatted the drive while using the Mac. I ejected the drive from Windows, and plugged it back into the Mac. The drive appeared as usual, but when I opened it, the Finder window was completely blank. I checked the Get Info box, and the drive still has my data on it, as the current occupied space matched what I had put on it. However, the permissions was set back to read only. Even after I mounted the drive with NTFS Mounter, the permissions were still read only, and no data was visible in the Finder window. I know the data is on there, but the drive appears as though it's completely blank. Since it's an external USB drive, I can't fix drive errors or repair permissions with Disk Utility. Similarly, I can't run CKHDSK on Windows because Windows won't mount the drive, claiming that it has to be formatted first. I fear the worst: that the drive has somehow become corrupted, and the format is no longer readable by either Windows or Mac. I may have to reformat the hard drive, and that in itself won't be so bad, but is there anyway that I can recover the data on it before I do so? As stated previously, I know it is on there, I just simply can't access it. I'm completely stumped, and any help would be appreciated!