I'm a huge fan of robocopy and use it extensively to copy between various servers I need to update.
Lately I've been archiving to an Amazon S3 account that I access via a mapped drive using JungleDisk. I then robocopy my files from local PC to S3.
Sometimes I get a very strange 'Incorrect function' error message in robocopy and the file fails to copy. I've tried xcopy and straightforward copy and paste between file explorer windows. In each case I get some variation of the 'Incorrect function' or 'Illegal MS-DOS function' and the file will never copy.
I delete the target but to no avail.
Any ideas?