![]() Uninstall or disable drive-monitoring or scanning utilities These can be anything including extensions for running third-party devices, filesystem drivers, or background utilities for managing drives. If so then you might look at any system add-ons you have installed to see if they could be contributing to the errors. ![]() Try minimizing your boot environment when running Time Machine, so boot to Safe Mode (by holding the Shift key at startup) to load only the essential extensions and system features. Instructions for running a full general maintenance routine can be found here. Whenever OS X systems experience unknown slowdowns, one option is to perform a general maintenance routine that will clear caches and other temporary files from the system, in addition to ensuring various system maintenance scripts get run properly. In addition to using Disk Utility, if you have a more robust drive management tool like Drive Genius, Disk Warrior, Tech Tool Pro, or Disk Tools Pro, then using it may be a more thorough way of testing and checking the drive for errors. If you see these warnings (especially if they are coupled with system pauses and hangs), then your drive may have bad blocks or other problems that can cause slowdowns. If you do this, open the Console and select the All Messages section to see if any I/O-related warnings show up when the drive is being erased. The first repair routine will check and fix problems with the volume's format, and the second routine will check the drive's partition tables.Ī last test you can do is to use Disk Utility to erase the free space on the drive (done on the Erase tab), which will write zeros to any unused portions of the drive. Then, select the Time Machine drive itself (the device shown above the volume, with the drive size in its name) and again click Repair Disk. Then on the First Aid tab click the Repair Disk button and wait for the repair routine to complete. To do this, open Disk Utility and select the Time Machine volume. The next step would be to check the drive for errors to see if any problems can be found involving the drive's filesystem setups (including format structure and partitions) or the drive's write medium. ![]() In Disk Utility, first click the volume (1) and select Repair Disk to fix errors on it, then do the same for the drive itself (2) to check the partition schemes. ![]()
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