I bought 2 of these on sale. One was for myself and the other for my sister. These drives included files to set-up SanDisk Secure Access V3, which is good if you want to secure files, but it is not necessary to use the drive as unsecured storage. We did not know this. There were no instructions, so we assumed that you simply insert the drive and transfer files. That's the way we've done it with smaller drives. Well, you can do that, but upon first inserting the drives, different pop-ups seem to imply that the secure access is necessary, and we were prompted to set it up, which took a while, because the file on the drive was old, and buggy. We downloaded the appropriate files and eventually installed and set up the Secure Access. We each didn't think we would need it, I mean, I didn't buy the drives for the security, but we thought it may be a good feature...just in case. Had we known how much trouble it was, we would have simply forgotten it and erased any installation files. Well, every now and then, I test the "vault" out, but I am unable to put any files into it. I am given error messages, and none of the several methods to add files are working. I have considered re-installing the appropriate files from the website, but I really don't think it's worth the trouble. I will just have to be satisfied with the high capacity of this item.