The following message appears in the Agent log:
DEBUG 2016-09-08T04:18:11 [6] - Replay.Agent.NativeWrapper.Drivers.DriverApi (RequestUri=https://10.35.50.92:8006/apprecovery/api/agent/transfer/snapshots/bf59d1fb-15fa-41ec-ac09-e88cd622d186/volumes/~|~|%3f~|Volume{6b6835b0-22c5-45b2-8714-e62599472a0b}|~/blocks/changed ClientAddress=10.35.50.201:50434 Service=Replay.Agent.Management.Transfer.TransferManagement Method=GetVolumeChangedBlocks)
Found bogus change record for byte offset 0x9f7dffe00, byte length 0x200, start block 0x4fbeff, offset into first block 0x1e00, num blocks 0x1. Returning an error code to force a new base image.
Environment:
Win 2012 R2 machine
Steps to reproduce:
1. Install disk editor software on the agent server.
2. Launch disk editor.
3. Select 'Navigate' menu item >> Primary NTFS >> Boot Sector Copy.

4. Edit Boot Sector Copy (in this case unused sector was changed and re-written with value '00 00').
5. Save changes.
6. Force incremental snapshot.