Origin or 1.44 MV FD label [WAS: RE: Weekly Classic Computer Trivia Question (20141205)]

Tom Gardner t.gardner at computer.org
Sun Dec 7 14:46:01 CST 2014

>-----Original Message-----
>From: Fred Cisin [mailto:cisin at xenosoft.com] 
>Sent: Saturday, December 06, 2014 12:40 PM
>To: General Discussion: On-Topic and Off-Topic Posts
>Subject: Re: Weekly Classic Computer Trivia Question (20141205)

>>On Sat, 6 Dec 2014, Johnny Billquist wrote:
>> I should actually do my math before commenting. :-) It just happens, 
>> that by a funny accident, 1440*1024 is actually 1,474,560.
>> But still. The actual size of the floppy wasn't decided because you 
>> pulled out 1440*1024, but because of the format of the darn thing.
>> 1.44MB is just the closest "nice" number you can come up with after 
>> the fact as a way to talk about the capacity of the thing.
>> It is not an exact number, but they seldom are, when we talk about 
>> storage. People like to round things off, to make it easier to talk

>It is NOT a "nice" number.
>Honest numbers would be either 1.47 or 1.4 There is no legitimate way to
come up with 1.44 unless you cheat and MIX powers of 10 and powers of 2.
It comes from a double capacity 720 KB FDD - which in this case are actually
KiB and not kB
However, in an incredible bit of marketing stupidity it was labeled 1.44 MB,
since 2*720 KB/1000 = 1.44 MB

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