the error in cristaldisk comes from S.M.A.R.T.
that is a system which informs the possible problems with arts inside the hard disk like platters, heads, surface, anything there
windows only cases for the partition
if cristaldisk says caution the only question to do here is, have you made backups? once a warning comes the time before loosing all your files could be soon so have a plan b, a backup here is a must, well, always, you must have backups of your important personal files in case the hard disk dies and stops working or anything happens with the pc
after that would be if the hard disk is old or still under warranty, if old, i would buy another and put that hard disk in storage as a plan d