Not always getting USB3 speeds?

Discussion in 'Mac mini' started by MattZani, Nov 13, 2012.

  1. macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #1
    Just got a 2012 Mac Mini, Toshiba USB3 external HDD, doesn't seem to get USB3 speeds after its been to sleep, reverts back to USB2 until I unplug and replug it, unmounting doesn't work.

    Any ideas?
     
  2. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #2
    don't sleep the mini. it is low energy when not sleeping. or sell the toshiba. I never sleep a mini. only the screen.
     
  3. macrumors 6502

    That-Guy

    Joined:
    Feb 25, 2012
    Location:
    UK
    #3
    Do you have another Hard Drive to test this with? if so do you still have the same problem?
     
  4. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #4
    Not another USB3 one no, its only slightly faster than a USB2 one I have, but not anywhere near USB3 speed.
     
  5. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #5
    you do realize that the toshiba usb3 has a very slow hdd in it you are lucky if you get 80mbs if it is the 2.5 inch one and about 110mbs if it is the 3.5 inch one.
     
  6. macrumors regular

    Joined:
    May 18, 2010
    #6
    So you are monitoring that before sleep, the usb3 speeds were (a lot) higher than after sleep?

    Give us the results of the performance. I can't really judge right now what is going on. Try this program: Blackmagic’s Disk Speed Test.
     
  7. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #7
    My mistake, its actually a Hitachi Tuoro, I think anyway. 3.5".

    Before sleep - roughly 100mb/s read/write
    After sleep - roughly 30mb/s read/write
     
  8. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #8
    yeah the usb3 function is auto sense. sleep turns it off on 2 of my usb3 drives. So I never sleep the mini just the display. In my case the display burns a lot of power so when the mini turns off the signal to the display the power saved is quite a bit.

    the mini on idle but not sleep burns around 7-8 watts.

    the screen drops from 18 watts to 2 watts when the display is turned to sleep. so the savings are pretty good. not perfect.

    sleep and pcs/macs always have conflicts.


    try setting the energy saver like this >>>>>>>>>>>>>>>>>>>>>>
     

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  9. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #9
    That's what I always have, I just used to sleep it myself when going to sleep etc. kind of annoying. Hopefully an update will cure this?
     
  10. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #10
    SO YOU ARE ONLY sleeping off the display not the mini?

    this setting works with my usb3.

    let me check.

    yeah I don't lose the usb3 when just the screen sleeps.
     

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  11. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #11
    No, I meant when putting the whole thing to sleep. At the moment I have no devices listed under the USB3 part, but Touro 3.0 under USB Hi-Speed Bus.

    If I un/replug it it's listed under USB 3 SuperSpeed Bus and I get USB3 speeds.
     
  12. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #12
    yeah my guess is this will never be fixed. sleep has always had bugs with certain devices. all I can say is sleep the display and not the mini.
     
  13. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #13
    How annoying. Assuming its the external thats causing the issue though?
     
  14. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #14
    past on threads on many pcs/macs over the last few years with problems like yours yes. But as always just a guess maybe 85% sure. It may be true with any and all usb3 devices. I gave up sleeping any pc/mac years ago I just sleep the displays .

    I have 6 pc/s and 3 minis I would go nuts trying to fix issues like this. I am lucky in that the pc's need to run 24/7. the 3 minis cost me about 25 watts an hour on idle. that is about 15k watts a month or $2.50 a month . worth the hassle of trouble shooting
     
  15. macrumors newbie

    Joined:
    Aug 2, 2013
    #15

    I just found the same thing same set up.! did you get a fix for this ? I am going to return the drive a faulty if not.!
     
  16. macrumors 68000

    Joined:
    Jul 30, 2012
    #16
    Why would you sleep it anyway? It demands the same user intervention as powering on and off.
    If I have my mini downloading or so, I use the 1-minute monitor off delay (XBMC keeps it awake when watching movies), and if I do nothing, I just turn it off. It is booted back in 15 seconds (on a HD, not even SSD), so I don't care about sleep.
     
  17. macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    #17
    I just sleep the screen , but I never sleep the mini
     
  18. thread starter macrumors 68020

    MattZani

    Joined:
    Apr 20, 2008
    Location:
    UK
    #18
    As an update, I never really fixed this. It's not the Mini sleeping (I just switch the screen off), it's the drive, and I'd rather not have it spinning all the time. So most the time I use it as USB2, and if I need to do a big back up (switched off auto due to another issue with it not waking up quick enough for TM) I just unplug it and plug it in so I get USB3 speeds.

    Must be a fault somewhere along the USB3 line, my USB3 CF reader never has the problem but then it doesn't sleep.
     
  19. macrumors newbie

    Joined:
    Jun 10, 2013
    #19
    USB 3.0 not working - the reason why

    Apparently, the USB speed is determined by the FIRST USB device that the system encounters so if you have a keyboard, or mouse, then this will cause the system to use USB 2.0 even when it discovers a Touro 4tB drivecapable of USB 3.0.
     
  20. jbarley, Oct 3, 2013
    Last edited: Oct 3, 2013

    macrumors 65816

    Joined:
    Jul 1, 2006
    Location:
    Vancouver Island
    #20
    that is referring to daisy-chaining, first device connected

    USB2->USB3->mini = USB3 speed (for the USB3 device)
    USB3->USB2->mini = USB2 speed (for both devices)
     

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