It is also worth noting that poor or slow drive performance is usually caused by a system configuration factor. Other limitations can include the transfer rate that is possible given the bus (ie, USB, SATA, Thunderbolt). Some of the bandwidth will be shared with other devices on the bus and some will be consumed by commands and interface protocol overhead. This is because no storage device will have all of this "potential" bandwidth available for data transfers. This leads almost invariably to disappointment when their USB external hard drive does not transfer data at 50 MB/sec or their SATA internal drive at 300 MB/sec. Many hard drive users mistake the "burst transfer rate" in the table above for what they can expect to see in real-world performance. The Thunderbolt interface is faster than SATA 3.0, so the SATA 3.0 drive and interface are the "bottleneck".īurst transfer rate vs. It may be that the destination disk and the interface can move and write data faster than the source disk can send it.Įxample: Backing up the data contained on a Serial ATA 3.0 drive to an external drive equipped with a Thunderbolt interface. The Serial ATA drive and interface are faster than USB 2.0, so the USB 2.0 drive and interface are the "bottleneck". It may be that the source disk is newer and can push data faster than the destination disk can write it.Įxample: Backing up the data contained on a Serial ATA 6.0 drive to an external drive equipped with a USB 2.0 interface.
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