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When moving a large number of files, especially in bulk, there are several factors that can affect the speed of the process. Moving files in smaller batches rather than all at once can sometimes lead to faster overall transfer speeds due to the following reasons:

1. Reduced Overhead: When transferring files in bulk, the operating system needs to manage a large number of file operations simultaneously, which can result in increased overhead. This overhead includes tasks such as tracking file progress, allocating system resources, and managing file locks. By breaking the transfer into smaller batches, the overall overhead is reduced, leading to more efficient file transfers.

2. Optimized Disk Access: Disk access speed can be a bottleneck when transferring files, especially if the files are located on a traditional hard disk drive (HDD) rather than a solid-state drive (SSD). When transferring files in smaller batches, the disk's read and write heads can access the data more efficiently, leading to faster overall transfer speeds. Additionally, smaller batches allow for better disk caching and optimization by the operating system.

3. Fault Tolerance: Transferring files in smaller batches reduces the risk of errors or interruptions during the transfer process. If an error occurs during a large bulk transfer, it may require restarting the entire transfer from the beginning. However, when transferring files in smaller batches, any errors that occur affect only a portion of the files, making it easier to identify and resolve issues without impacting the entire transfer.

4. Resource Allocation: Transferring files in smaller batches allows for better utilization of system resources such as CPU, memory, and network bandwidth. By spreading out the file transfers over time, other system tasks can continue to execute efficiently without being significantly impacted by the file transfer process.

Overall, while transferring files in smaller batches may require more upfront planning and coordination, it can lead to faster and more reliable file transfers, especially when dealing with a large number of files or limited system resources.