SanDisk SecureAccess 2.0

Here’s the problem and why my files were lost.  I was able to replicate the Sandisk error and took a screen shot of it but I don’t see a way to attach it or copy into this thread.  It says, “The application can not add more files because the vault’s disk is full.”  I have 14.9 gb free.  Is it possible my files are somewhere else on the disk?  It looks like only the first 20 copied over.