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Event ID: 40961 Source: VSS

ASR Warning: Failed to collect disk information for ASR Backup. Reason: Unable to obtain disk information for device 3 (Win32 error code 0x1).
From a support forum: "In my case, this error was incorrect presentation of ISCSI disks".
From a support forum: "I got this while using the CommVault Simpana backup. The Bridgehead software backs up the system state and I think it has its own VSS and that's what's messing up CV, will just have to back up the machine without the Simpana VSS."
A support forum suggests the following in order to obtain more details information about the potential problem:

Open an administrative command prompt and run the following:

vssadmin list writers

There should be a handful of them, as well as any associated errors.

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