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Copying 258Mb to a Corsair formatted NTFS starts fast then slows dramatically to 339kB/sec at the end, 20 minutes later. These are USB3 sticks on USB3 ports on my W530 Thinkpad. After reading the posts I formatted the 35Gb Corsair with ext4 and now it isn't seen at all on neither of my Ubuntu 16.4 Ubuntu machines. The only way I can copy seems to be using Deja'dup to external HDDs or by burning DVDs. I say "seems" as I have not tried a restore yet. Anyone have any ideas? Are there any drivers that I can download. I'm trying to hang in there until a new machine hopefully arrives in a month or so - Thanks - Garoolgan

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    Try according to the following link (and links from it), askubuntu.com/questions/144852/… Maybe the USB 3 pendrives are not working well with your computer's USB system. You can check that by trying in some other computer(s) and with some other USB pendrive(s).
    – sudodus
    Jan 21, 2018 at 14:00
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    Can you check the last few lines of the output of dmesg (type this command into a terminal) a few seconds after plugging in your USB sticks? If any errors occurred, they should be visible there. Anyway, a slowdown in USB write speed is generally a normal thing, as the real maximum write speed is the one you experience in the end, whereas the quick start is due to caching the data to write in RAM. I do agree that USB 3 should support faster speed than 400kB/s though, at least several MB/s (compare e.g. tomshardware.com/reviews/usb-3.0-thumb-drive-review,3477-2.html)
    – Byte Commander
    Jan 21, 2018 at 14:57
  • The results are very long but here are the last few lines starting with a mention of Corsair>>>>
    – Garoolgan
    Jan 22, 2018 at 14:25
  • 16640.887109] scsi 6:0:0:0: Direct-Access Corsair Voyager 3.0 1.00 PQ: 0 ANSI: 5 [16640.887827] sd 6:0:0:0: Attached scsi generic sg2 type 0 [16640.889323] sd 6:0:0:0: [sdb] 62685184 512-byte logical blocks: (32.1 GB/29.9 GiB) [16640.889455] sd 6:0:0:0: [sdb] Write Protect is off [16640.889461] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00 [16640.889596] sd 6:0:0:0: [sdb] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA [16640.891632] sdb: sdb1 [16640.897990] sd 6:0:0:0: [sdb] Attached SCSI removable disk admin10561@admin10561-ThinkPad-W530:~$ ^C
    – Garoolgan
    Jan 22, 2018 at 14:36
  • When I did a new clean install on a new 240Gb SSD disk the speed of USB transfers came back to near the manufactuer's speeds.
    – Garoolgan
    Feb 26, 2018 at 15:53

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