Casper.Dik at Sun.COM wrote: > Taking off belenix-discuss and opensolaris-discuss, since my earlier mail bounced saying that I am a non-member.
>>> i was trying to achieve the speeds mentioned according to the usb 2.0 specs. >>> http://en.wikipedia.org/wiki/USB_2.0#USB_2.0 >> Hi Arun, >> >> What is the speed that you are expecting? >> Line speed for USB Hi speed is 480 Mbits/s. >> So it is 60 MB/s. >> (Note the differences ib M*Bits* and M*Bytes*) >> >> You are getting : >> ~18 MB/s on Read >> ~4 MB/s on Write > > >>> arun at opensolaris:/media# rmformat >>> Looking for devices... >>> 1. Logical Node: /dev/rdsk/c11t0d0p0 >>> Physical Node: /pci at 0,0/pci1043,81ef at 13,5/storage at 6/disk >>> at 0,0 >>> Connected Device: Kingston DT 101 II 1.00 >>> Device Type: Removable >>> Bus: USB >>> Size: 15.3 GB >>> Label: repo0906 >>> Access permissions: Medium is not write protected. > > Kingston say the maximum read/write speed is 10MB/s (both ways). > Thats another thing. After I sent the mail, I started thinking about dd's report of the throughput. I guess it needs to be measured using more reliable means. Measuring on different platforms (Linux/Windows) will probably give us a clearer picture of what the actual throughput is. Pavan > Not sure why the "Read" returns more quickly than the device specifies. > > (http://www.kingston.com/flash/dt_chart.asp) > > Casper >
