WHEN ATTEMPTING TO CLONE MY HSRD DRIVE ERROR 254 APPEARS

My Mac Pro is a vintage (first ones on the market) I am trying to increase the disk size

Disk Utility cannot verify your hard drive for some reason. Try repairing the hard drive and permissions:
Repair the Hard Drive and Permissions - Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
See if that helps any. If it doesn't, then there may be something more serious with the drive. You might need to repartition it. I suggest that you first make a bootable USB Recovery Flash Drive. You will need a 2 GB USB flash drive partitioned GUID and formatted Mac OS Extended, Journaled.
OS X- About Recovery Disk Assistant
OS X Recovery Disk Assistant v1.0
You would use OPTION booting to boot from the flash drive. You can then use Disk Utility to repartition and reformat your internal hard drive. If the drive is now functional you can then reinstall OS X.

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