lanceb96342529 wrote:
Thanks, Sarika. Yes, that is the problem. The external disk is "Read Only".
Using Disk Utility, it wont allow me to alter the permissions. This leads
me to the conclusion that the disk is "on the way out". Fortunately I have
backups.
Thanks again!
Lance
That is because more than likely that external is formatted in the Windows format, NTFS, and you had a utility installed in your previous version of OS X that could write to NTFS formatted drives and the El Capitan update removed that utility. OS X can Read NTFS drives natively but can't write to that format. You'll need to update that utility to a version that works with El Capitan.