Device is Not Ready (ERROR CODE 1075)


Error messages:

  • Device is not ready
  • I/O error.


Possible occurrence reasons

  • Operating system tries to use a transfer mode that the hardware device cannot use
  • Input/output request number by operating system exceeds the hard drive capacities
  • The hard drive is damaged


In case these errors keep occurring, do the following steps:

  • Decrease thread count
  • Schedule backup plans for low load periods. Don't run the backup in high load hours (non-working hours are recommended).

To Decrease Thread Count

  1. Open Backup for Windows.
  2. In the Tools menu, select Options.

  1. In the Thread count field, set 2.
  2. Click OK or Apply.

In case issues occur during image-based backup plans:

  1. Open the plan that reports these errors, then click Edit.
  2. Follow the wizard steps to Advanced options, then click Show Advanced Disk Options.

  1. In the Prefetch block count (0 without prefetch) field, set 50.
  2. In the Block size drop-down list, select 512 KB.
  3. Follow the wizard steps to save the plan configuration.

In case you use an external USB drive:

  • Reinstall the external disk driver

To Reinstall the Driver

  1. In the Control Panel, open the Device Manager.
  2. Right-click your external device, then select Uninstall.

Do not disconnect the external drive

  1. Restart the instance.
  2. Windows will attempt to reinstall the driver automatically.

If measures do not bring any effect, the issue is hardware-based. The following steps can be of help:

  • Check the S.M.A.R.T. status of the physical drive that is backed up. For example, you can use this tool:
  • Use the standard Windows tool chkdsk. To start the tool, open the console, then run the following command: chkdsk {drivename} /f, where {drivename} is a volume of the disk to be scanned