>> 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
