wow! Jacob! just reading that and all of those numbers just made my head spin! Thank God I am getting off of work in 30 minutes. lol.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jacob Kruger Sent: Wednesday, March 30, 2011 2:01 PM To: [email protected] Subject: Re: [Blind-Computing] USB 2 and 3 what are they? Cool. Will mention one more silly thing that lots of people don't seem to know/realise is relevant, but which occured to me now, but generally when someone mentions something like the bitrate (quality) of something like an MP3 file, or in the case of USB port speeds, where they're talking about Kb per second, Kb (lowercase b) = kilobit, whereas KB (uppercase B) = kilobyte, and the diffference there is that 1 byte = 8 bits, and this also applies to megabits (Mb) as opposed to megabytes (MB), the less commonly used one gigabits (Gb) as opposed to gigabytes (GB) etc. That's why, for example, something like a commonly sized MP3 track of 192kbps (192 kilobits per second) with a track length of 2 minutes and 30 seconds, which then comes to 150 seconds in total would be roundabout 3.5MB - 192 kilobits per second multiplied by 150 seconds = 28800 kilobits, and if you then divide that by 8, it comes to 3600 kilobytes, which is you then divide it by 1024 for the conversion to megabytes that comes out to 3.515625 megabytes - and that also brings up the fact that while a kilometer is 1000 meters, a kilobyte is 1024 bytes, a megabyte is 1024 kilobytes, a gigabyte is 1024 megabytes, a terabyte is 1024 gigabytes, etc. etc. - as opposed to normal numbering where it's simple thousands that get multiplied as such. Anyway, these are things I was specifically taught a long time ago during computer science classes in high school, but anyway...<smile> Stay well Jacob Kruger Blind Biker Skype: BlindZA '...fate had broken his body, but not his spirit...' ----- Original Message ----- From: "Niamh" <[email protected]> To: <[email protected]> Sent: Wednesday, March 30, 2011 9:03 PM Subject: Re: [Blind-Computing] USB 2 and 3 what are they? > Jacob and Matthew, > Thank you so much. > I can now hold my own, I feel empowered. > I new to being blind, and could not survive at work without this website > and your knowledge and help. > Many thanks > niamh > ----- Original Message ----- > From: "Jacob Kruger" <[email protected]> > To: <[email protected]> > Sent: Wednesday, March 30, 2011 5:18 PM > Subject: Re: [Blind-Computing] USB 2 and 3 what are they? > > >> From the Wikipedia page relating to USB (universal serial bus): >> http://en.wikipedia.org/wiki/Usb >> >> under the history heading: >> "The original USB 1.0 specification, which was introduced in January >> 1996, had a data transfer rate of 1.5 Mbit/s.[5] The first widely used >> version of USB was 1.1, which was released in September 1998. It allowed >> for a 12 Mbit/s data rate for higher-speed devices such as disk drives, >> and a lower 1.5 Mbit/s rate for low bandwidth devices such as >> joysticks.[6] >> >> The USB 2.0 specification was released in April 2000 and was standardized >> by the USB-IF at the end of 2001. Hewlett-Packard, Intel, Lucent >> Technologies (now Alcatel-Lucent), NEC and Philips jointly led the >> initiative to develop a higher data transfer rate, with the resulting >> specification achieving 480 Mbit/s, a fortyfold increase over the >> original USB 1.1 specification. >> >> The USB 3.0 specification was published on 12 November 2008. Its main >> goals were to increase the data transfer rate (up to 5Gbps), to decrease >> power consumption, to increase power output, and to be >> backwards-compatible with USB 2.0.[7] USB 3.0 includes a new, higher >> speed bus called SuperSpeed in parallel with the USB 2.0 bus.[8] For this >> reason, the new version is also called SuperSpeed.[9] The first USB 3.0 >> equipped devices were presented in January 2010.[9]" >> >> Jacob Kruger >> Blind Biker >> Skype: BlindZA >> '...fate had broken his body, but not his spirit...' >> >> ----- Original Message ----- >> From: "Matthew C" <[email protected]> >> To: <[email protected]> >> Sent: Wednesday, March 30, 2011 5:10 PM >> Subject: Re: [Blind-Computing] USB 2 and 3 what are they? >> >> >>>I believe it has something to do with the speed of transmition of data. >>>2.0 >>> would be slower than say 3.0. >>> >>> -----Original Message----- >>> From: [email protected] >>> [mailto:[email protected]] On Behalf Of Niamh >>> Sent: Wednesday, March 30, 2011 9:14 AM >>> To: [email protected] >>> Subject: [Blind-Computing] USB 2 and 3 what are they? >>> >>> Sorry to be useless here, but people keep throwing these things at me at >>> work, and I haven't a clue what they are talking about. >>> Because we are security conscious we have to back up certain files to >>> off-line hard drives. >>> Now people are talking about USB 2 and 3, what does this mean? >>> Niamh >>> For answers to frequently asked questions about this list visit: >>> http://www.jaws-users.com/help/ >>> Send any questions regarding list management to: >>> [email protected] >>> >>> >>> For answers to frequently asked questions about this list visit: >>> http://www.jaws-users.com/help/ >>> Send any questions regarding list management to: >>> [email protected] >> >> >> For answers to frequently asked questions about this list visit: >> http://www.jaws-users.com/help/ >> Send any questions regarding list management to: >> [email protected] > > > For answers to frequently asked questions about this list visit: > http://www.jaws-users.com/help/ > Send any questions regarding list management to: > [email protected] For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/ Send any questions regarding list management to: [email protected] For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/ Send any questions regarding list management to: [email protected]
