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Thread: Installing ubuntu on USB 3.0 External SSD

  1. #1
    Join Date
    Oct 2012

    Lightbulb Installing ubuntu on USB 3.0 External SSD

    As we know, Solid state drives are much quicker compared to normal HDDS when it comes to transer of data.

    If i were to install a ubuntu on a usb 3.0 External ssd, then boot it from my boot menu in my bios, would I be able to take advantage of the fast speeds that SSD can provide?

    I mean, the SSD is connected through the usb 3.0 connection - which is a minor bottleneck - but in theory, i should be able to get significantly greater speeds then if i were to install it on my HDD?

  2. #2
    Join Date
    Jun 2009
    SW Forida
    Ubuntu 16.04 Xenial Xerus

    Re: Installing ubuntu on USB 3.0 External SSD

    Depending on SATA2 or SATA3 hard drive will be faster. And some discuss theory and others mention a more practical number so I do not have total consistency in my notes.

    SATA II - 3.0 Gbit/s
    SATA revision 3.0 (SATA 6 Gbit/s)

    Mb/s or MB/s? USB 2.0 tops out at 480Mbps, which is about 50MB/sec.
    The theoretical maximum data rate in USB 2.0 is 480 Mbit/s (60 MB/s) per controller
    SuperSpeed (USB 3.0) rate of 4800 Mbit/s (~572 MB/s).
    But speeds are more limited by devices at each end.

    My SSD is a low cost OEM version, I have seen newer ones rated twice mine.

    SSD speed
    fred@fred-Precise:~$ sudo hdparm -t /dev/sdd4
    Timing buffered disk reads: 626 MB in 3.01 seconds = 208.20 MB/sec
    Older 160GB rotating drive:
    Timing buffered disk reads: 212 MB in 3.01 seconds = 70.46 MB/sec
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