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#261830 17-Dec-2019 10:08
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I've got a 500GB 2.5" SATA drive rescued from a dead notebook, that I'm using as an external drive in an "Orico" branded drive enclosure with USB-C port.  Transfer rates are pretty pathetic to two PCs, a 7th gen Nuc or a notebook, both with USB-C and USB-A 3.1 ports


The fastest transfer rate I've seen is about 50MB/s, about 10% of what the SSD is supposedly capable of (6Gb/s). 50MB/s is about the same as old 2.5" HDDs I use for backup. The drive enclosure came with a USB-C -> USB-A cable, that I'd have thunk should have been up to task, but on the other hand the drive enclosure - including that cable - cost less than outrageous retail prices of a quality cable alone. 


The only USB-C -> USB-C cable I've got is a "Cygnett" armoured 5A cable, that seems to work fine fast-charging all devices (phones etc) when plugged in to USB-C port on the NUC or notebook, but data transfer rates to the SSD are the same as when using the USB-C - USB-A cable.


So what's likely going on?  Is the (cheap) drive enclosure the bottleneck, or is it that none of the USB-C cables I've got up to the task for fast data transfer?  




Edit:  I found the drive enclosure on PBTech site: link


I now see this review:


Yes the enclosure has a USB-c port but fails to mention the cable supplied with it goes from USB-c to standard USB. So you need an adaptor to plug it into a USB-c port on a computer, which defeats the whole point of getting it in the first place.


My experience with what I'd have thought was a quality USB-C -> C cable makes me think it's worse than that, the enclosure probably has USB 2.0 guts in it - but wired up to a USB-C port.  My googling uncovers the same enclosures being sold on TM, claiming 6 Gb/s data transfer speed.  I think I've been done.

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  #2376872 17-Dec-2019 11:51
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USB-C to USB-A will make no difference over USB-C to USB-C if they are both USB 3.1 spec. its just a different shape connector on the end


what type of drive is the old 500GB 2.5" SATA drive? spinning or SSD? how fast could the drive transfer in the old notebook?


my 5TB USB3 external drive (Spinning disk) gives me about 120MB/s connected to a USB3 port and about 36MB/s connected to a USB2 port. My USB3 flash drive does 240MB/s over USB3 and 40MB/s over USB2


i suspect your issue lies with the drive you have put in the enclosure, and possibly the enclosure itself. unless you know what the drive was good for before putting it in there there is no way to tell for sure.



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  #2376873 17-Dec-2019 11:57
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in general a SATA III hard drive at 5,400 RPM will have speeds of around 100MB/s, while a 7,200 RPM will be 150MB/s.


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  #2376874 17-Dec-2019 11:58
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Possibly even 4300rpm. If you want fast, put an SSD in the enclosure.  The spinning disk is your bottleneck.

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  #2376991 17-Dec-2019 13:05
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Oops - it is a SATA (3) SSD - not HDD, so theoretical max transfer rate 6 Gb/s, and that's what's marked on the drive.  (I mentioned it was an SSD in 2nd paragraph).  I didn't check actual data transfer rate when it was in the notebook. 


Anyway, I think I've found the problem.  My mistake - it actually does transfer at >300MB/s via the USB-C -> USB-A cable supplied.  That's a pretty decent speed - about what I'd expected - close to half theoretical maximum anyway.


So the cheap drive enclosure with USB port is not the problem.


The problem is with the "Cygnet" branded "armoured 5A" USB-C -> USB-C cable.  I see them on sale at MightyApe for $39.  Ouch - and double-ouch when it doesn't work very well. If that's actually what is the problem is, add it to my list of USB annoyances.  I note that on the MightyApe site, it's sold under the category "phone charger cables".

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  #2376992 17-Dec-2019 13:07
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My mistake, but good work isolating the issue

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  #2377037 17-Dec-2019 14:05
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Check if the chip in it does UASP mode, if not, then you will get crap speeds and high CPU.


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