MBP - External Transfer rates MB/s>Mb/s

Discussion in 'MacBook Pro' started by Marty62, Feb 9, 2014.

  1. Marty62 macrumors 6502

    Joined:
    Mar 11, 2010
    Location:
    Berlin formerly London
    #1
    Some clarification needed here, is my understanding of the two standards
    MB/s and Mb/s ( Megabytes verses Megabits ) correct ?

    A quote from an Everythingusb post about these figures :

    "During any normal migration from a USB 2.0 to USB 2.0
    averaged around 20 MB/s on any drive I've ever used.
    Upgrading from the USB 2.0 to a USB 3.0 got me an average of 40 MB/s.
    On transferring from USB 3.0 to USB 3.0 I got an average of 58 MB/s. Read the speeds below.
    A Low Speed (USB 1.1, USB 2.0) rate of 1.5 Mbit/s (187 kB/s)
    that is mostly used for Human Interface Devices (HID) such as keyboards, mice, and joysticks.
    A Full Speed (USB 1.1, USB 2.0)rate of 12 Mbit/s (1.5 MB/s). Most USB Hubs support FullSpeed.
    A Hi-Speed (USB 2.0) rate of 480 Mbit/s (60 MB/s).
    A Super-Speed (USB 3.0) rate of 4.8 Gbit/s (600MB/s)"


    SO ... with a new & empty Lacie 7200rpm USB2.0 external drive, if I see a
    Speed Disk measurement of say 40 MB/s then this is X8 to get Mb/s, that's
    320 Mb/s ... not far from USB2.0 max spec of 480 Mb/s ??

    Is this correct ??

    Many thanks for clarification OR letting me know if I have this totally wrong !!

    Regards,
    Martin.
     
  2. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Joined:
    Aug 5, 2001
    Location:
    Denmark
  3. Marty62 thread starter macrumors 6502

    Joined:
    Mar 11, 2010
    Location:
    Berlin formerly London
    #3

    Many thanks - makes me quite relieved to say the least !!

    Martin.
     
  4. g4cube macrumors 6502a

    Joined:
    Apr 22, 2003
    #4
    It's not the ca se that is 7200rpm. :D

    But a Modern 7200 or 5400 or 5900 RPM drive should get you close to the 38-40 MB theoretical speed limit. Right drive, right bridge chip inside and you will be happy.

    Even better, a true USB 3.0 case will still be best.
     
  5. Marty62 thread starter macrumors 6502

    Joined:
    Mar 11, 2010
    Location:
    Berlin formerly London
    #5
    In this instance, It's a USB3.0 drive on a USB2.0 equipped MBP !!

    It still managed approx 43MB/s so 344Mb/s .... not too bad !

    Internal SSD managed 485MB/s so ... x 8 3,880Mb/s :D:D

    M.
     

Share This Page