Realistically, this value is reached very seldom during normal computer operations as most data needs to be read/written directly from the platters of the hard drive. Maximum Buffer to Host Rate: Indicates the maximum rate that data can be transferred from the Buffer memory to the NVME, Serial ATA, USB, ThunderBold or FireWire bridge (still contained within the physical hard drive).Most modern hard drives have intelligent buffer management functionality built into hard drive indicating that the most commonly used data is held in the drive buffer for better performance of data access. Drive Buffer (also known as Cache or drive Memory):The buffer on the hard drive (the buffer of Western Digital hard drives can be 2 MB, 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, 256 MB) acts as a temporary staging area for data that is to be read from or written to the hard drive.To understand each transfer rate, you first must understand how the Drive Buffer works. Drive specific performance specifications. This is why many hard drive manufacturers do not provide a 'Sustained Transfer Rate' for hard drives. Benchmarking results are very system dependent and the results can vary from system to system.

Most hard drive manufacturers provide three major performance specifications Maximum Buffer to Host Rate, Maximum Buffer to Disk Rate, and Implied Speed of the Connection Interface (NVME, Serial ATA, FireWire 400, FireWire 800, ThunderBolt, USB 1.1, USB 2.0, USB 3.0, USB 3.1). SUPERSPEED USB - USB 3.2 (Gen 1), USB 3.1 (Gen 1), USB 3.0 SUPERSPEED USB 10Gbps - USB 3.2 (Gen 2), USB 3.1 (Gen 2)

SUPERSPEED USB 20Gbps - USB 3.2 (Gen 2x2)

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