On Wed, 7 Feb 2007, Mark Glassberg wrote:
> I ran "dd if=/dev/sdb of=/dev/null" and found that the drive is being
> read at 9.5 Mb/sec. Sorry, you didn't get the device file data, I sent
> it twice. Here it is:
>
> T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=054c ProdID=0243 Rev= 1.00
> S: Manufacturer=Sony
> S: Product=Storage Media
> S: SerialNumber=1806100416128
> C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
> E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=31875us
>
> Hope this helps. Thanks again,
> Mark
Okay, good, that's quite clear. On the top line it says "Spd=480". That
means the device is communicating at 480 Mb/s (high speed), which is the
fastest rate available to USB.
Your 9.5 Mb/sec figure doesn't seem right. Are you sure you don't mean
9.5 MB/s instead ("megabytes-per-second" instead of
"megabits-per-second")? Even that would be a little on the low side for a
real disk drive, but perhaps flash memory or its USB interface doesn't
have as high performance. For example, my (somewhat old) flash device
manages only 5.5 MB/s, and a newer devices rates 8.7 MB/s.
Alan Stern
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