PaulNM on 27 Mar 2008 17:29:50 -0700 |
Stephen Gran wrote: > On Thu, Mar 27, 2008 at 10:40:36AM -0400, PaulNM said: >> Not to be pedantic, but it's actually 100Mbit/sec = 11.920929 >> MBytes/sec. > > Not to be even more pedantic, but it's not 10**8, it's 100 * 1024 * 1024. > Unless you're a hard drive manufacturer, of course. :) > >> Bits are decimal while bytes are binary. > > Um, no. Bits are binary, bytes are 8 bits. Network transfer speeds measure bits as decimal notation (1Kbit=1,000bits), as do most mentions of bitrate. From http://en.wikipedia.org/wiki/Bit_rate : "When describing bitrates, binary prefixes have almost never been used and SI prefixes are almost always used with the standard, decimal meanings, not the old computer-oriented binary meanings. Binary usage may occasionally be seen when the unit is the byte/s, and is not typical for telecommunication links. Sometimes it is necessary to seek clarification of the units used in a particular context." See also http://en.wikipedia.org/wiki/Data_signaling_rate From http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci212541,00.html "Some sources define a megabit to mean 1,048,576 (that is, 220) bits. Although the bit is a unit of the binary number system, bits in data communications are discrete signal pulses and have historically been counted using the decimal number system." Storage, on the other hand, does tend to measure bits in binary notation (1Kbit=1,024bits). The whole issue can get very confusing. Since the thread was about data transfer speeds, I went with decimal notation for bits. In retrospect, it would probably been more accurate for me to say "powers of 2 / powers of 10" instead of binary / decimal. PaulNM ___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
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