When performing P2V conversions Converter creates a VSS snapshot on the source server. By default the amount of space used for VSS snapshots is set to a small percent of the disk free space. When you perform conversion to the same snapshotted drive you actually want to write another copy of all your data to the same drive. This will cause the VSS snapshot to expand to a value that is equal to the data you have on your disk and this most likely is above the VSS limit set by the system, which can cause errors in read/write operations later.
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