Re: [gentoo-user] {OT} USB 3.0 hard drive speed test

[Grant <emailgrant@gmail.com>]

>> I'm testing this USB 3.0 bus-powered hard drive:
>>
>> http://www.amazon.com/gp/product/B0041OSQ9S
>>
>> and I get:
>>
>> # hdparm -tT /dev/sdb
>> /dev/sdb:
>> Timing cached reads:   8006 MB in  2.00 seconds = 4004.33 MB/sec
>> Timing buffered disk reads: 252 MB in  3.01 seconds =  83.63 MB/sec
>>
>> # hdparm -tT /dev/sdb
>> /dev/sdb:
>> Timing cached reads:   8230 MB in  2.00 seconds = 4116.54 MB/sec
>> Timing buffered disk reads: 252 MB in  3.02 seconds =  83.55 MB/sec
>>
>> # hdparm -tT /dev/sdb
>> /dev/sdb:
>> Timing cached reads:   8446 MB in  2.00 seconds = 4224.36 MB/sec
>> Timing buffered disk reads: 230 MB in  3.02 seconds =  76.28 MB/sec
>>
>> Wikipedia says USB 3.0 has transmission speeds of up to 5 Gbit/s.
>> Doesn't MB/sec denote mega*bytes* per second?
>>
>> - Grant
>
> 4000MB/s = 4Gb/s

OK, I thought "B" designated bytes and "b" designated bits.  So when
you see something like MB/s or Mb/s there's no way to know if it's
referring to megabits or megabytes?

- Grant