Reading of a snapshot diff area's metadata completed. Volume GUID: %1 Snapshot GUID: %2 Count of 1MB Reads: %3 Count of 16KB ...

Windows 10

Reading of a snapshot diff area's metadata completed.

Volume GUID: %1
Snapshot GUID: %2
Count of 1MB Reads: %3
Count of 16KB Reads: %4
Diff Area Metadata Size: %5 Bytes

Guidance:
When a volume is brought online or reverted to a snapshot, the volume snapshot driver reads the diff area for the most-recent persistent snapshot (if any).  The diff area for earlier persistent snapshots is typically read the first time the snapshot is read from.  The size of the diff area metadata may be less than the total size of the reads (i.e. Size < Count_1MB * 1MB + Count_16KB * 16KB) if the diff area is discontiguous on disk.

You should expect this event when a volume is brought online, reverted to a snapshot, or when reading from a persistent snapshot for the first time after bringing a volume online.  This event may also occur if a volume is dismounted that contains snapshots that have not been read since the volume was brought online.  No user action is required.

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