Symptoms

You attempt to perform a disk or partition backup that fails with one of the following error:

CRC error.

| error 0x70003: Read error.
| line: 0xdf81da2c74ec50c8
| file: e:\235\core\resizer\backup\output_stream.cpp:262
| function: `anonymous-namespace'::OutputStreamImpl::ReadDrive
| $module: disk_bundle_vsa64_10330
|
| error 0x10c481: Failed to read the snapshot. To troubleshoot VSS issues, download and run Acronis VSS Doctor available at https://www.acronis.com/en-us/personal/vss-diagnostic-free-tool/
| line: 0x3fec04e376b89f07
| file: e:\235\core\fdisk\win_snapshot.cpp:529
| function: win_snapshot_volume::IoOp
| $module: disk_bundle_vsa64_10330
|
| error 0x100155: CRC error.
| line: 0x2aacb7b2ab852af
| file: e:\235\core\fdisk\ver2\arch\windows\win_errors.cpp:43
| function: Fdisk::AddKstatusError
| $module: disk_bundle_vsa64_10330

Or

Failed to read the snapshot.

Error code: 50266
Module: 16
LineInfo: 14181c22ef45add5
Fields: $module : disk_bundle_vs_32308
Message: Failed to read the snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields:
code : 87, $module : disk_bundle_vs_32308
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942487, $module : disk_bundle_vs_32308
Message: The parameter is incorrect

Cause

The most common reason is a physical error on the hard drive that you attempt to back up.

Another possible reason is high workload on the backed up drives at backup time.

Solution

Reschedule backup to a time when the workload is lower.

Find the faulty disk using Windows Event Viewer and Acronis Disk Report:

Review Windows event logs, see details in this article.

Review Acronis Disk Report, as described below.

How to use Acronis Disk Report

1. Run Acronis system report. See Acronis System Report;
2. The tool's output is an archive with diagnostic information. Find the disk report within it and check if there are errors

   

   The C column stands for Full partition check status:

   C - means there are no errors
   E - means, there is an error found
   W - means a warning

3. If there is an E or a W, then it is recommended to check the partition for errors and repair:
   1. Make sure that you have a healthy backup of the machine. If not, create one using Acronis Bootable Media.
   2. Go to command prompt (Start -> run -> cmd) and enter following command:

      chkdsk DISK: /r

      where DISK is the partition letter you need to check. Please note, that checking the C: drive may require you to reboot the machine.

If the issue persist, please create a system report (see Acronis Cyber Protect Cloud: Collecting System Report, Acronis Cyber Backup 12.5 and 12: Collecting System Information, Acronis Cyber Backup 11.7/11.5: Generating System Report) of the affected machine and contact Acronis Support with a reference to this article.