I have a Maxtor Onetouch4 HD which I used on my old PC running Win XP pro and file system NTFS. Periodically it would run Ckdisk but no problem. I now use it on my new PC using Win7, twice during the last few weeks I have been unable to access some files on it and have had to put it back on the old PC so it runs chdisk to sort it out. I don't want to keep doing this, what could be the cause of the problem in the first place. I think that I will have to leave it on the old PC and access files from there.I don't want to risk losing the files. Couild it be a problem with Win7?