Slow external USB 3 HDD

Discussion in 'Newbie Lounge' started by FR3D1, Jun 19, 2017.

  1. FR3D1

    FR3D1 Member

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    I just got a new 2TB USB 3 Hard Drive. I transfer some file into it from an SSD but it only copy at 35mb/s then I ran some benchmark it show that it can do ~80mb/s. I got confused so I put in another drive and copy the exact file across and it copied at 80mb/s. This helps to prove that its not the port not operating at USB 3 so does anyone know why is it only copy so slow?
     
  2. Andy3008

    Andy3008 Member

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    Was the 2nd drive the same as the original ?
     
  3. callan

    callan Member

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    35MB/Sec sounds awfully like USB2 (which tops out at 40MB/Sec).
    Did you get any messages like "this device could be operating faster" when you plugged it in?

    I have found USB 3 drive performance to vary wildly.

    Callan
     
  4. FR3D1

    FR3D1 Member

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    The drive that only copies at 35 is a Seagate Expansion and the one that can do 80 is Toshiba Cavio.

    I didn't get any message as such.

    I pretty sure that around 80mb/s is standard for all USB 3.0 hard drive these days (well maybe 10-15mb/s less but not half) just really confused why when I ran benchmark show that it can do 80 but when copying actual (single) file it only top at 35.
     
    Last edited: Jun 20, 2017
  5. terrastrife

    terrastrife Member

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    35-80 sound about right for 2.5" mechanical 5400RPM drives.
    If a drive already has files on it, writing may be in fragments, when a disk is seeking, it's going at 0KB/sec.
     
  6. FOTW

    FOTW Member

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    It also depends on what type of data your copying, I do allot of manual backups for customers and use a Tosh Canvio Basic USB3 and it can hit 80mbs when copying large files such as a video file however once it hits the folders that is storing pictures, music and documents it can drop right down to 20-40Mbs.

    Also it can be a combination of both HDDs heads flying all over the place copying fragmented files as well as read/write speeds of both HDDs.

    Try copying exact data to each HDD and see if there is a difference. Does the new HDD get to 80Mbs at all when copying data?

    The seagate may have a lower amount of cache and cant keep a sustained 80mbs.
     
    Last edited: Jun 21, 2017
  7. brainstew

    brainstew Member

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    You can also try confirm in Device Manager that the drive hasn't decided to sliip to a USB 2.0 internal hub. Open Device Manager then click View-> Devices by connection.

    On my laptop, I have to restart with the drive plugged in or it will stick to a USB 2.0 internal hub because it has a dodgy internal hub with the laptop's webcam and bluetooth chip connected to...
     
    Last edited: Jun 21, 2017
  8. FR3D1

    FR3D1 Member

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    I think thats the problem. I did a surface test before using the drive and it must filled up the disk. I deleted the files but as you know Windows doesn't actually 'remove' them but rather overwrite when you copy a file. Is there a way can can force it to delete the file without format?
     
    Last edited: Jun 24, 2017
  9. FOTW

    FOTW Member

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    Not sure if you can zero out the HDD with out formating it. Try piriform CCleaner and use the wipe free space function try the 1 pass option.
     
  10. Bold Eagle

    Bold Eagle Member

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    What is the make, model and S/N:# of the unit?

    What is the format of the HDD? differences can be found from the format type.

    Can you swap the cable?

    As stated above file type (construct) can also influence copy rate.
     
    Last edited: Jun 23, 2017
  11. FR3D1

    FR3D1 Member

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    This seem to be the solution. I can now copy file at 100mb/s. Is it weird that the drive show up as SCSI Disk Drive in Device Manager?
     
  12. Bold Eagle

    Bold Eagle Member

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    https://en.wikipedia.org/wiki/SCSI
     

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