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
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