Shrink the volume by a small amount ie 1000MB then extend. This fixes a corruption at the end of the volume sometimes caused by HP intelligent provisioning. https://social.technet.microsoft.com/Forums/en-US/7aa15059-646e-4c42-9bc8-bface95e94c9/server-2012-server-backups-the-drive-cannot-find-the-sector-requested?forum=windowsbackup https://social.technet.microsoft.com/Forums/en-US/7aa15059-646e-4c42-9bc8-bface95e94c9/server-2012-server-backups-the-drive-cannot-find-the-sector-requested?forum=windowsbackup