![]() 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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