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<blockquote data-quote="London1974" data-source="post: 1761128" data-attributes="member: 393326">I have a problem with USB speed performance on my Macbook.I have a Macbook Pro (Retina, 15-inch, Mid 2015), Processor 2.5 GHz Intel Core i7Memory 16GBIt runs Os X El CapitanI have lately encounter some issues with my USB external drives. Though I am using USB 3.0 drives their transfer speed is consistently USB 2.0 (max 430 Mbps, not even 480).The external HD are different brands, one is LaCie P9220 Media 2 TB and 1 is BUFFALO HD-PNTU3I have to format the LaCie recently, and i am doing some backup transfer files. But is all very slow. I tried transferring single files 1.04 GB takes 13.40seconds from external to SSD internal drive. About 15 sec to another external HD USB 3.0Large folders :&nbsp; Transferred&nbsp; 39.68 GB from the Lacie to the Buffalo in 12m13s (about 429mbs)The USB Device Tree under system report shows the two drives as USB 3.0.The cables are working fine (the usb 3 cable and no external extension)I tried with one HD connected same results.I reset PRAM and SMC, same results. Any suggestions to get the drives perform as per their specifications?</blockquote>

[QUOTE="London1974, post: 1761128, member: 393326"] I have a problem with USB speed performance on my Macbook. I have a Macbook Pro (Retina, 15-inch, Mid 2015), Processor 2.5 GHz Intel Core i7 Memory 16GB It runs Os X El Capitan I have lately encounter some issues with my USB external drives. Though I am using USB 3.0 drives their transfer speed is consistently USB 2.0 (max 430 Mbps, not even 480). The external HD are different brands, one is LaCie P9220 Media 2 TB and 1 is BUFFALO HD-PNTU3 I have to format the LaCie recently, and i am doing some backup transfer files. But is all very slow. I tried transferring single files 1.04 GB takes 13.40seconds from external to SSD internal drive. About 15 sec to another external HD USB 3.0 Large folders : Transferred 39.68 GB from the Lacie to the Buffalo in 12m13s (about 429mbs) The USB Device Tree under system report shows the two drives as USB 3.0. The cables are working fine (the usb 3 cable and no external extension) I tried with one HD connected same results. I reset PRAM and SMC, same results. Any suggestions to get the drives perform as per their specifications? [/QUOTE]

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