You are migrating several terabytes of historical sensor data to Google Cloud Storage. The data is organized into files with one file per sensor per day. The files are named with the date followed by the sensor ID. After loading 10 percent of the data, you realize that the data loads are not proceeding as fast as expected. What might be the cause?

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You are migrating several terabytes of historical sensor data to Google Cloud Storage. The data is organized into files with one file per sensor per day. The files are named with the date followed by the sensor ID. After loading 10 percent of the data, you realize that the data loads are not proceeding as fast as expected. What might be the cause?