In fact, many new computers sold today still feature USB 2.0 only. Most users are stuck with USB 2.0 until they buy a new computer, even if the computer they have is relatively new. Unfortunately, most computers in use today don’t have integrated USB 3.0 ports. USB 3.0 peripherals are proliferating, with lots of affordably priced external hard drives, Blu-ray burners and other devices to choose from. I suspect other memory like those found in USB flash drives could also be the slowest weakest link if they are the cheap kind.USB 3.0 is about 10 times faster than USB 2.0, making it a terrific upgrade, and a great way to save time by cutting down on file transfer times. So once again USB 2.0 maxes out at 40 MB/s and slows down from the next weakest link at which is the 25 MB/s HDD should it get filled up. I know the 500 GB drive is not the bottleneck since it has read/write speeds of 70 MB/s if it was attached to a USB 3.0 port on a newer Macbook. I also did the above test with a regular spinning 2.5" Laptop 500 GB Toshiba HDD as the external drive inside the USB 3.0 Nexstar CX External Enclosure and it starts off with write speeds of 40 MB/s, but as the 500 GB gets filled up it gets slower effective rpm near the centre of the hdd disc and it slows down to 25 MB/s. containing a SATA OCZ Vertex 4 SSD 128 GB.attached to a USB 3.0 NEXSTAR CX External Enclosure.through the Macbook's USB 2.0 port (weakest/slowest link in the chain).Within the Macbook's main HDD bay (not the CD bay) is an Internal SATA 3 Samsung 840 PRO SSD 256 GB.
Here is the setup with USB 2.0 being the bottleneck.
I only get a max USB 2.0 speed of 40 MB/S transferring a large 1 GB file from a macbook ssd to an external ssd via a USB 2.0 port.
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